USA S TAN DAR D

D R AFT N G P RAe T C E S

ELECTRICAL AND

ELECTRONICS ,

USAS Yl4.l5· 1966 (REAFFIRMED 1973)

Spon:Jor:J

American Society for Engineering Education The American Soc iety of Mechanical Engineers

DIAGRAMS

Including

PROPOSED USA STANDARD FOR CONNECTION DIAGRAMS AND TERMINAL DIAGRAMS

THE AMER(CAN SOCIETY OF MECHANICAL ENGINEERS

United Engineering Center 345 East 47th Street New York, N. Y. 10017

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USA 5 TAN DAR D

D R AFT N G P RAe T C E S

ELECTRICAL AND

ELECTRONICS DIAGRAMS

USAS Y14.15 - 1966

USA STANDARD APPROVED includes the following:

15-1 Scope 15-2 Definitions 15-3 General Infonnation 15-4 Single-Line Diagrams, General 15-5 Single-Line Diagrams (Electronics and Communications) 15-6 Single-Line Diagrams (Power Switchgear and

Industrial Control) 15-7 Schematic Diagrams, General 15-8 Schematic Diagrams (Electronics and Communication) 15-9 Schematic Diagrams (Power Switchgear and

Industrial Control)

PROPOSED USA STANDARD includes the following:

15-10 Connection Diagrams 15-12 Terminal Diagrams

This USA Standard is one of nearly 3000 standards approved as American Stan­dard by the American Standards Association. On August 24, 1966, the ASA was reconstituted as the United States of America Standards Institute. Standards ap­proved as American Standard are now designated USA Standards. There is no change in their index identification or technical content.

Second Printing: July 1969

UDC 621.7:744

Copyright © 1966 THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

Printed in U.S.A.

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Foreword

Subcommittee 15 - Electrical and Electronic Diagrams - was formed on April 26, 1964, as a subcommittee of Sectional Committee Yl4-Standards for Draw­ings and Drafting. When formed, this subcommittee was charged with the responsi­bility of preparing a drafting standard covering "electrical schematic, wiring and block diagrams for use in the communications, electronic, electric power, indus­trial control, telephone, telegraph and allied industries." A natural addition to this scope was the inclusion of military considerations through participation by re-presentatives of the Department of Defense.

The creation of such a standard, acceptable to the manufacture of electrical equipment and to industrial, military and utility users, often in areas which were themselves undergoing development, has been an exercise in cooperation and compromise. The overriding purpose of all of the participants has been to issue a single USA standard which could be used as a reference in purchasing equipment, cited as authority in contract and military specifications and ap­plicable as a guide for drafting and design personnel responsible for drawings for production or for use wholly within a plant or company.

For this standard to be so widely applicable it had to be made broad and per­missive; therefore compromise was essential, particularly in terminology, but such compromise had the beneficial effect of expediting its issue and of making it generally available. We hope its effect is to unify drafting practices and that future revisions will refl~ct increasing uniformity by eliminating multiple options and establishing preferred methods and nomenclature.

Paragraphs 15-1 to 15-9 inclusive were approved by the Sectional Committee, the sponsors and the USA Standards Institute, and were designated USA Standard on December 2, 1966.

Paragraphs 15-10 and 15-12 were approved by the Sectional Committee on July 20, 1966 for issue on a trial basis to provide an opportunity for industry to comment before final adoption of these paragraphs as a USA Standard. If this standard if referred to, all paragraphs (including 15-10 and 15-12) apply unless specific exception are indicated.

iii

Sectional Committee Y14,

Standards for Drawings and Drafting Practice

OFFICERS

F. L. Spalding, Chairman C. H. Keams, Secretary

SECTIONAL COMMITTEE

AMERICAN INSTITUTE FOR DESIGN AND DRAFTING T. J. Annstrong, International Business Corp., Poughkeepsie, N. Y.

AMERICAN SOCIETY OF CIVIL ENGINEERS J. W. Guppy, U.S. Steel Corp., New York, N. Y.

AMERICAN SOCIETY FOR ENGINEERING EDUCATION, THE R. W. Bokenkamp, University of Illinois, Urbana, Illinois C. H. Kearns, Ohio State University, Columbus, Ohio W. J. Luzadder, Purdue University, West Lafayette, Indiana R. S. Paffenbarger, Ohio State University, Columbus, Ohio H. C. Spencer, Waco, Texas C. H. Springer, N. Fort Myers, Florida C. L. Svensen, Austin, Texas C. J. Vierck, Jupiter, Florida

AMERICAN SOCIETY OF HEATING, REFRIGERATING & AIR CONDITIONING ENGINEERS Fritz Homerkamp, Anemostat Corp. of America, Scranton, Pa. J. J. Donovan, Alternate, Carrier Corp., Syracuse, N. Y. H. P. Tinning, Alternate, American Society of Heating, Refrigerating & Air Conditioning Engineers, New York, N.Y.

AMERICAN SOCIETY OF MECHANICAL ENGINEERS, THE N. L. Bean, Dearborn, Michigan A. R. Machell, Xerox Corp., Rochester, N. Y. F. L. Spalding, University of Illinois, Urbana, Illinois

AMERICAN SOCIETY OF TOOL & MANUFACTURING ENGINEERS Joe Penn, Indianapolis, Indiana

ASSOCIATION OF AMERICAN RAILROADS M. F. McCorcIe, St. Louis-San Francisco Railway, Springfield, Missouri

BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION W. T. Barton, International Business Machines Corp., Endicott, N. Y.

ILLUMINATING ENGINEERING SOCIETY L. E. Barbrow, National Bureau of Standards, Washington, D. C. C. L. Crouch, Alternate, Illuminating Engineering Society, New York, N. Y.

INSTITUTE OF ELECTRICAL & ELECTRONICS ENGINEERS, THE F. P. Kuhl, Consolidated Edison Co. of N. Y., Inc., New York, N. Y. C. R. Muller, ITT Federal Laboratories, Clifton, N. J.

MANUFACTURERS CHEMISTS' ASSOCIATION, INC. J. E. Ross, E. I. duPont de Nemours & Co., Inc., Wilmington, Delaware

MANUFACTURERS GROUP E. H. Koenig, Keuffel & Esser Co., Hoboken, N.j.

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE & FITTINGS INDUSTRY R. V. Warrick, Manufacturers Standardization Society of the Valve & Fittings Industry, New York, N. Y.

NATIONAL ELECTRICAL MANUF ACTURERS ASSOCIATION C. H. Bayer, General Electric Co., Schenectady, N. Y. L. D. Price, Alternate, National Electrical Manufacturers Association, New York, N. Y.

NATIONAL FLUID POWER ASSOCIATION J. L. Fisher, Jr., Bellows-Valvair, Akron, Ohio

NATIONAL MACHINE TOOL BUILDERS' ASSOCIATION L. G. Glesmann, Gleason Works, Rochester, N. Y.

SOCIETY OF AUTOMOTIVE ENGINEERS Joe Stannard, Pratt & Whitney Aircraft, E. Hartford, Connecticut R. P. Trowbridge, General Motors Technical Center, Warren, Michigan J. A. Boxall, Alternate, Detroit, Michigan

SOCIETY OF NAVAL ARCHITECTS & MARINE ENGINEERS G. R. Daniels, Quincy, Massachusetts '

iv

TELEPHONE GROUP, THE R. ]. Harazin, Western Electric Co., Inc., Chicago, Illinois C. H. Heller, Bell Telephone Laboratories, Inc., Murray Hill, N.]. G. Sawyer, Alternate, Bell Telephone Laboratories, Murray Hill, N.].

TRADE AND HIGH SCHOOL GROUP Frank Scott, Belleville Junior College, Belleville, Illinois

DEPT. OF THE ARMY C. A. Nazian, liaison, Ordnance, Frankford Arsenal, Philadelphia, Pa. A. J. Stitzel, Alternate, Ordnance, U.S. Army Materiel Command, Washington, D. C.

DEPT. OF COMMERCE D. M. Mills, Patent Office, Washington, D. C.

DEPT. OF THE NAVY Code 609.3C, liaison, Bureau of Ships, Washington, D. C. S. C. Miller, liaison, Bureau of Naval Weapons, Washington, D. C. ]. E. Walter, Alternate, Bureau of Naval Weapctns, Washington, D. C.

INDIVIDUAL MEMBERS R. F. Franciose, General Electric Co. C. A. Slater, Bendix Corp., Kansas City, Missouri

Personnel of Subcommittee 15 on Electrical and Electronic Diagrams

CHAIRMEN S. H. Horowitz, Chairman, Y14.15, American Electric Power Service Corp., New York, N.Y. 10008 C. R. Muller, Chairman, Task Group, No.1, ITT Federal Laboratories, Nutley, New Jersey W. C. Fulton, Chairman, Task Group, No.2, Westinghouse Electric Corp., East Pittsburgh, Pa. J. J. O'Farrell, Jr., Chairman, Task Group, No.3, International Business Machines Corp., Armonk, N. Y.

TASK GROUP NO. 1 - MEMBERS S. Alvine, ]r., Kearfott Div., General Precision, Inc., Little Falls, N.}. V. W. Bennett, Chairman, Bell Telephone Laboratories, Inc., New York, N. Y. D. C. Bowen * (Chairman Y14.15 1954-1959), Radio Corporation of America, Camden 2, New} ersey S. Campagna * (1954-1961), Sylvania Electric Products, Inc., Buffalo, N. Y. V. W. Chabal, Radio Corporation of America, Camden, N.]. E. M. Eckhardt, Tawl-Ned, Picatinny Arsenal, Dover, N.}. C. ]. Eiwen t, American Machine and Foundry Co., Alexandria, Va. C. A. Fricke, Philco Corp., Tech. Rep. Div., Ft. washington, Pa. ]. M. Glass t, Hughes Aircraft Co., Culver City, Calif. L. Green, Raytheon Company, Wayland, Mass. ]. L. Kallas, Bell Telephone Laboratories, Inc., Whippany Road, Whippany, N.} • G. A. Knapp, General Electric Co., Utica, N. Y. ]. Kovac * (1954-1963), Bell Telephone Laboratories, Whippany, N. J. R. C. Luca * (1963-1965), Sperry Gyroscope Co., Great Neck, Long Island, N. Y. L. A. Meadows, Dept. of the Navy, Bureau of Ships, Washington, D.C. V. C. Meigs t, North American Aviation, Inc., Anaheim, Calif. E. Miller, Westinghouse Electric Corp., Baitimpre, Md. A. T. NintzeI * (1955-1963), Sperry Gyroscope Co., Great Neck, Long Island, N. Y. O. I. Nordrum, U.S. Army Electronics Laboratories, Ft. Monmouth, N. J. B. N. Orr, Procurement and Production, Hq, U. S. Army Electronics Command, Ft. Monmouth, N.}. T. T. Robertson t, Sandia Corp., Alburquerque, N. M.

tCorresponding Member *Past Members

v

TASK GROUP NO.2 - MEMBERS H. C. Barnes t, American Electric Power Service Corp., New York, N. Y. 10008 S. C. Ewing, General Electric Co., Salem, Virginia R. B. Harvey, Ebasco Services, New York, New York 10006 W. L. Healy, USA Standards Institute, New York, N. Y. (formerly with General Electric Co., Philadelphia, Pa.) J. P. Houck, Westinghouse Electric Corp., East Pittsburgh, Pa. L. L. MacDonald, Public Service Electric & Gas Co., Newark 1, New Jersey L. E. Markle t, Westinghouse Electric Corp., Buffalo, New York J. J. Moyer, Bureau of Ships, Washington, D. C. H. Muller t, American Electric Power Service Corp., New York, New York 10008 D. L. Pierce, Westinghouse Electric Corp., Buffalo, New York D. A. Roberson t, TSE, ARO Inc., Tullahoma, Tenn. R. E. Seddon *, (formerly Chairman), E. I. duPont de Nemours & Co., Wilmington, Delaware K. R. Walch, General Electric, Phi ladelphia, Pa. J. Youngblood t, Detroi t Edison Co., Detroit, Michigan

t Corresponding Member * Past Members

vi

Contents

15-1 Scope .......................•.............. .. 15-2 Definitions .................................... .

15-2.1 Single-Line or One-Line Diagram •••••••••••••••••••• 15-2.2 Schematic or Elementary Diagram •••••••••••••••••••• 15-2.3 Connection or Wiring Diagram •••••••••••••••••••••• 15-2.4 Interconnection Diagram •••••••••••••••••••••••••• 15-2.5 Terminal Diagram •••••••••••••••••••••••••••••• 15-2.6 Other Terms ................................ .

15-3 General Information •••••••••••••••••••••••••••••••• 15-3.1 Other Reference Standards •••••••••••••••••••••••• 15-3.2 Diagram Titles ............................... . 15-3.3 Combined Forms of Diagrams •••••••••••••••••••••• 15-3.4 Drawing Size and Format ••••••••••••••••••••••••• 15-3.5 Line Conventions and Lettering •••••••••••••••••••••

15-3.5.1 Lower Case Letters ••••••••••••••••••••••••• 15-3.6 Graphic Symbols •••••••••••••••••••••••••••••••

15-3.6.1 Representation of Electrical Contacts ••••••••••••• 15-3.7 Abbreviations ............................•.•. 15-3.8 Layout of Diagrams •••••••••••••••••••••••••••••

15-3.8.1 Grouping of Parts ••••••••••••••••••••••••••• 15-3.9 Drawing Number Reference Location •••••••••••••••••• 15-3.10 Diagram Revisions •••••••••••••••••••••••••••• 15-3.11 Color Information •••••••••••••••••••••••••••••

15-4 Single-Line Diagrams, General ••••••••••••••••••••••••• 15-5 Single-Line Diagrams (Electronics and Communications) •••••••• 15-6 Single-Line Diagrams (Power Switchgear and Industrial Control) .••

15-6.1 General Information ••••••••••••••••••••••••••••• 15-6.2 Contents .................................. .

15-6.2.1 Ratings ••••••••••••••••••••••••••••••••• 15-6.2.2 Winding Connection Symbols •••••••••••••••••••• 15-6.2.3 Neutral and Ground Connections ••••••••••••••••• 15-6.2.4 Feeder Circuits •••••••••••••••••••••••••••• 15-6.2.5 Protective Relaying •••••••••••••••••••••••• '. 15-6.2.6 Instruments, Meters and Associated Switches ••••••••• 15-6.2.7 Power Circuit Breaker Mechanism ••••••••••••••.• 15-6.2.8 Ratios of Instrument Transformers ••••.•••••••••••

15-6.3 General Layout ••••••••••••••••••••••••••••••• 15-6.3.1 Graphic Symbols ••••••••••••••••••••••••••• 15-6.3.2 Abbreviations ••••••••••••••••••••••••••••• 15-6.3.3 Device Designations ••••••••••••••••••••••••• 15-6.3.4 Course of Main Circuits ••••••••••••••••••••••• 15-6.3.5 Horizontal and Vertical ••••••••••••••••••••••• 15-6.3.6 Voltage Arrangement •••••••••••••••••••••••••

15-6.4 Typical Single-Line Diagrams ••••••••••••••.••••••• 15-7 Schematic Diagrams, General ••••••••••••••••••••••••••

15-7.1 Layout .................................... . 15-7.2 Connecting Lines ••••••••••••••••••••••••••••••

15-7.2.1 Spacing ••••••••••••••••••••••••••••••••• 15-7.2.2 J unctions and Crossovers •••••••••••••••••••••

15-7.3 Interrupted Paths •••••••••••••••••••••••••••••• 15-7.3.1 Interrupted Single Lines •••••••••••••••••••••• 15-7.3.2 Interrupted Grouped Lined •••••••••••••••••••••

15-7.4 Mechanical Linkages •••••••••••••••••••••••••••• 15-8 Schematic Diagrams (Electronics and Communication) ••••••••••

15-8.1 Layout .................................•... 15-8.2 Drawing Zones ............•.•................. 15-8.3 Circuit Return and Connection Symbols •••••••••••••••• 15-8.4 Terminals .................................. .

15.8.4.1 Identification of Terminals (General) •••••••••••••• 15-8.4.1.1 Adjustable Resistor Terminal Identification •••••• 15-8.4.1.2 Switch Terminals and Circuit Functions •••••••••

vii

Page

1 1 1 1 1 1 2 2 2 2 3 3 3 3 3 3 3 4 '4 4 4 4 4 4 4 5 5 5 5 6 6 6 6 6 7 7 7 7 7 7 7 B 8 8

11 11 11 11 11 11 11 12 12 13 13 13 13 13 13 14 14

15-S.4.1.3 Electron Tube Pin Identification •••••••••••••• 15-S.4.1.4 Connector Coaxial Contact Identification •••••••• 15-S.4.1.5 Integral Cir~uit Package, Circuit Pack orSubassembly

Terminations ••••••••••••••••••••••••••• 15-S.4.1.6 Circuit Pack Representation in Overall and Other

Schematic Diagrams ••••••••••••••••••• • • 15-S.5 Division of Parts ••••••••••••••••••

15-S.5.1 Identification of Parts by Suffix Letter •••••••• 15-S.5.2 Identification of Rotary Switch Parts ••• 15-S.5.3 Iden tification 0 f Portions of Items •••• 15-S.5.4 Identification of Individual Terminals of Parts. 15-8.5.5 Detached Contact (Contact Separation) Methods

15-S.6 Reference Designations. 15-S.6.1 Letters ••••••• 15-8.6.2 Numbers •••••••• 15-S.6.3 Type Designations ••

15-S.7 Numerical Values. 15-S.7.1 Commas.... 15-S.7.2 Resistance. 15-S.7.3 Capacitance 15-S.7.4 Inductance • I 5-S. 7.5 Notes ••••• 15-S.7.6 Numerical Value and Reference Designation Placement

15-S~S Functional Identification of Parts. • ••••• 15-S.9 Test Points •••••••••••••••••••••• 15-S.10 Additional Circuit Information •••••••••

15-S.10.1 Partial Reference Designation Prefix 15-S.ll Examples of Schematic Diagrams for a Complete Item 15-S.12 Single-Line Diagrams for Microwave Circuits

15-S.12.1 Transmission Path Recognition Symbol. 15-S.12.2 Connector and Flange Symbols • 15-S.12.3 DC Continuity and Discontinuity 15-S.12.4 Pressure Seals ••••••••••• 15-S.12.5 Subassemblies ••••••••••••

15-9 Schematic Diagrams (Power Switchgear and Industrial Control) 15-9.1 Contents ..................••••••

15-9.1.1 Device Ratings (Fuses, Resistors, etc.) 15-9.1.1.1 Rating Location •••• 15-9.1.1.2 Current Transformers ••••

15-9.1.2 Explanatory Notes •••••••••• 15-9.1.3 Wire and Terminal Designations

15-9.1.3.1 Designation Location ••

. , .

15-9.1.4 Wire Designations ••••••••• 15-9.1.4.1 Designations Denoting a Function. 15-9.1.4.2 De~ignations Denoting Location •• 15-9.1.4.3 Assigned (Wire) Designations •••••

15-9.1.5 Terminal Designations •••••••••••• :15-9.1.5.1 Interconnecting Unrelated Terminal Designations.

15-9.1.6 Mechanism End of Power Circuit Breaker 15-9.2 General Layout ••••

15-9.2.1 Graphic Symbols ••••••••• 15-9.2.2 Abbreviations ••••••••••• 15-9.2.3 Device Function Designations

15-9.2.3.1 Device Function Designations for Power Switchgear. 15-9.2.3.2 Device Function Designations for Industrial Control.

15-9.2.4 Device Contacts ••• 15-9.2.5 Circuit Arrangements •• 15-9.2.6 Control Sources •••••• 15-9.2.7 Physical Relationship. 15-9.2.S Course of Circuit •••• 15-9.2.9 Horizontal and Vertical Lines •• 15-9.2.10 Phasing Indications •• 15-9.2.11 Polarity Indication ••••

15-9.3 Typical Schematic Diagrams •• viii

Page

15 15

15

15 15 15 16 16 16 17 17 17 17 17 IS IS IS IS 18 IS 19 19 19 19 19 19 26 26 26 26 26 26 2S 2S 2S 2S 2S 2S 29 29 29 29 29 29 30 30 30 30 31 31 31 31 31 31 31 31 31 32 32 32 32 32

Proposed Contents

Page 15-10 Connection Diagrams • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 39

15-10.1 Purpose ................... • . . . . . • . . . . . . . .. 39 15-10.2 Types ..............•................. -. . . .. 39

15-10.2.1 Continuous-Line Type. • • • • • • • • • • • • • • • • • • • • •• 39 15-10.2.2 Interrupted-Line Type • • • • • • • • • • • • • • • • • • • • • • • 39 15-10.2.3 Tabular Type. • • • • • • • • • • • • • • • • • • • • • • • • • • •• 39

15-10.3 Common Requirements • • • • • • • • • • • • • • • • • • • • • • • • •• 39 15-10.3.1 Equipment Views • • • • • • • • • • • • • • • • • • • • • • • • •• 39 15-10.3.2 Principal and Auxiliary Wiring View Selection ••••••• 39 15-10.3.3 Representation of Component Devices and Parts. • • • •• 41 15-10.3.4 Component Devices or Parts Symbol Size. • • • • • • • • •• 41 15-10.3.5 Terminals.... • • • • • • • • • • • • • • • • • • • • • • • • • •• 41

15-10.3.5.1 Perpendicular Planes • • • • • • • • • • • • • • • • • • •• 42 15-10.3.5.2 Terminal Boards or Strips ••••••••••••••••• 42

15-10.3.6 Arrangement of Component Devices or Parts ••••••••• \ 42 15-10.3.6.1 Critical Location. • • • • • • • • • • • • • • • • • • • • •• 42

15-10.3.7 Equipment Device or Part Orientation. • • • • • • • • • • •• 42 15-10.3.8 Designations... • • • • • • • • • • • • • • • • • • • • • • • • •• 42

15-10.3.8.1 Axial Lead and Pigtail Parts • • • • • • • • • • • • •.•• 43 15-10.3.8.2 Terminal or Wire Designations ••••••••••• : •• 43 15-10.3.8.3 Wiring Tie Point Designations •••••••••••••• 43

15-10.3.9 Device or Part Rating, Type, Range or Scale Indication. 43 15-10.3.10 Wire or Cable Size and Type. • • • • • • • • • • • • • • • •• 43

15-10.3.10.1 Identification......................... 43 15-10.3.10.2 Method of Identification on Diagram • • • • • • • • •• 43 15-10.3.10.3 Wire Color or Color Code Placement. • • • • • • • •• 44

15:10.3.11 Direct or Surface Wiring. • • • • • • • • • • • • • • • • • • •• 44 15-10.3.12 Critical Wiring. • • • • • • • • • • • • • • • • • • • • • • • • •• 44 15-10.3.13 Leads - Pigtail (PGT). • • • • • • • • • • • • • • • • • • • •• 44 15-10.3.14 Phasing Indication. • • • • • • • • • • • • • • • • • • • • • • •• 44 15-10.3.15 Polarity Indication •••••••••••••••••••••••• 44 15-10.3.16 Holes. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 44 15-10.3.17 Additional Cable Stitch Indication •••••••••••••• 45 15-10.3.18 Prewired Connections •••••••••••••••••••••• 45 15-10.3.19 Twisted Wire Designations • • • • • • • • • • • • • • • • • •• 45 15-10.3.20 Symbols • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 45 15-10.3.21 Drawing Notes • • • • • • • • • • • • • • • • • • • • • • • • • •• 45

15-10.4 Continuous-Line Type. • • • • • • • • • • • • • • • • • • • • • • • •• 45 15-10.4.1 Point-to-Point Diagrams. • • • • • • • • • • • • • • • • • . • •• 45

15-10.4.1.1 Application...................... • • • •• 46 15-10.4.2 Highway or Cable Diagrams ••••••••• • • • • • • • • •• 46

15-10.4.2.1 Feed Lines. • • • • • • • • • • • • • • • • • • • • • • • • •• 46 15-10.4.2.2 Wire Data ........................... . 15-10.4.2.3 Highway or Cable Lines •••••••••••••••••• 15-10.4.2.4 Critical and Segregated Wiring •••••••••••••.

15-10.5 Interrupted Line Type •••••••••••••••.••••••.••• 15-10.5.1 Base-Line or Feed-Line Diagrams •••••••••••••••

15-10.5.1.1 Layout ............................ . 15-10.5.1.2 Component Device or Part Locations - Base-Line

46 46 47 47 47 47

Memod. • • • • • . • • • . . . • • . • • • • . • • • . • . . .. 47 15-10.5.1.3 Component Device or Part Locations - Feed-Line

Method. . . . • . . . • • . • • . . . . . • • . • . • • . • . .. 49 15-10.5.1.4 Location Numbers and Letters •••.••.••••••• 49 15-10.5.1.5 Additions............................ 49 15-10.5.1.6 Base-Line Representation. • • • • • • • • • • • • • • •• 49 15-10.5.1.7 Feed-Line Representation. • • • • • • • • • • • • • • •• 49 15-10.5.1.8 Wire Color Indication •••••••••••••••••••• 56 15-10.5.1.9 Wires - Pigtail. • • • • • • • • • • • • • • • • • • • • • •• 56 15-10.5.1.10 Letter Suffixes for Wire Identification. • • • • • • •• 56

15-10.6 Tabular Type •••••••••••••••••••••.•••••.•••• 59 15-10.6.1 Wiring Information Arrangement. • • • • • • • • • • • • • • •• 59 15-10.6.2 Tabulation Sequence. • • • • • • • • • • • • • • • • • • • • • •• 60

15-10.6.2.1 ListingMethods ••••••••••••••••••••••• 60 15-10.6.3 Placement of Lists. • • • • • • • • • • • • • • • • • • • • • • •• 62

ix

15-10.6.4 Terminal Identification •••••••••••••••• 15-10.6.5 Pigtail Parts •••••••••••••••••••••••

15-10.6.5.1 Polarity or Orientation of Axial-Lead Parts 15-10.6.6 Supplementary Data.

15-12 Terminal Diagrams ••••••• 15-12.1 Circuit Representation •• 15-12.2 Terminal Representation and Arrangement 15-12.3 Orientation Features ••••••••••• 15-12.4 Terminal Arrangement Designations 15-12.5 Terminal Identification ••••••••••

15-12.5.1 Terminal Group Datum Lines •••

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62 62 66 66 66 66 66 67 67 67 67

Figures

3-1 Line Conventions for Diagrams 0 0 0 0 0 0 0 0 ••••••••••••• 0 0 •

5-1 Typical Single-Line Diagram (Electronics and Communications) 0 ••

6-1 Portion of a Typical Single-Line Diagram ••••••••••••••••• 6-2 Typical Generator Ratings ••••••••••••••••••••••••••• 6-3 Typical Winding Symbols •••••••••••••••••••••••••••• 6-4 Typical Oriented Generator and Transformer Phasor Symbols ••••• 6-5 Typical Transformer Neutral Ground Symbol •••••••••••••••• 6-6 Typical Marking of Feeder Circuit Load •••••••••••••••••• 6-7 Typical Protective Relay Connections ••••••••••••••••••• 6-8 Typical Instrumen t and Meter Connections ••• 0 •••••••••••• ~ 6-9 Illustration Showing Circuit Breaker Mechanism Symbol •••••• 0 •

6-10 Typical Instrument Transformer Symbols and Markings •••••• 0 0 0

6-11 Typical Power Switchgear Single-Line Diagram with Complete Device Designations •• 0 ••• 0 0 •• 0 ••••••••••••••••••••

6-12 Typical Power Switchgear Single-Line Diagram with Abbreviated Device Designations •••••••••••••••••••••••••••••••

6-13 Typical Industrial Control Single-Line Diagram •••••••••••• 0

7-1 Junctions and Crossovers • 0 •••••••••••••••••••••• 0 0 •

7-2 Identification of Interrupted Lines •• 0 •••• 0 0 ••••••••• 0 •••

7-3 Typical Arrangement of Line Identifications and Destinations •••• 7-4 Typical Interrupted Lines Interconnected by Dash Lines ••••••• 7-5 Typical Schematic Diagram showing Mechanical Linkages •• 0 •••

8-1 Terminal Identification Example - Toggle Switch. 0 0 0 0 0 ••• 0 ••

8-2 Terminal Identification Example - Rotary Switch 0 • 0 •••• 0 0 •••

8-3A Terminal Identification and Orientation-Lever Switch (Key) 0 0 • 0 ••

8-3B Relationship of Key top Front and Spring Terminal Quadrants

8-4 8-5

TyPical Lever Switch (Key) • 0 • 0 0 ••• 0 ••• 0 •••••••• 0 ••••

Terminal Identification Example - Adjustable Resistor •••••••• Position-Function Relationships for Rotary Switches (Optional Methods) ••••••••••••••••••••••••••••••••••••••

8-6 Position-Function Relationships for Rotary Switches (Tabular Method Only) ........•..•.......•................

8-7 Terminal Identification - Electron Tube Pins •••••••••••••• 8-8 Single-Line Diagram Representation ••••••• 0 0 • 0 0 • 0 0 0 0 •• 0 0

8-9 Complete Diagram Representation • 0 ••••• 0 • 0 •• 0 • 0 0 • 0 • 0 ••

8-10 Identification of Parts by Suffix Letters • 0 • 0 •••••••••• 0 0 0 0

8-11 Typical Development of a Graphic Symbol Complex Rotary Switches 8-12 Identification of Portions of Items 0 •• 0 •• 0 ••••••• 0 • 0 0 ••• 0

8-13 Identification of Individual Terminals 0 •••••• 0 ••••• 0 0 •• 0 • 0

8-14 Typical Table Indicating Omitted and Highest Numerical Reference Designations .................................. .

8-15 Reference Designation, Type Designation and Function - Electron Tubes and Semiconductors 0 0 0 •••••••••••••••••••• 0 0 0 •

Table 8-1 Multipliers 0 0 • 0 •• 0 •• 0 0 0 ••• 0 0 0 ••• 0 0 •• 0 0 0 0 • 0 0 • 0

8-16 Methods of Numerical Value and Reference Designation Placement. 8-17 Typical Switching-Circuit Schematic Diagram (Use of Junction Dots

Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . .......... . 8-18 Contact-Separation Method of Schematic Representation (Circuit

8-19 8-20 8-21 8-22 8-23 8-24 9-1 9-2 9-3 9-4 9-5 9-6

Same as Shown in Figure 8-17) •• 0 0 •• 0 0 •• 0 0 • 0 0 ••• 0 0 0 • 0 •

Typical Schematic Diagram (See 15-8oll for Other Forms). 0 0 0 • 0 •

Typical Schematic Diagram • 0 0 •• 0 • 0 • 0 •• 0 0 0 0 0 0 •• 0 0 0 0 • 0

Typical ~1aintenance Type-Schematic Dia~ram 0 • 0 0 0 ••• 0 0 0 •• 0

Typical Application of Circuit Return Symbols ••••••• 0 0 0 • 0 ••

Schematic Representation in Relation to Termination Method Used Typical Microwave-Circuit Schematic Diagram ••••• 0 ••• 0 0 •••

Typical Locations for Device Ratings ••• 0 • 0 •• 0 •• 0 •• 0 ••• 0

Typical Multi-Ratio Current Transformer Rating ••• 0 ••••• 0 •• 0

Typical Device Function Explanatory Note • 0 •••••••• 0 0 ••• 0

Typical Terminal and Wire Designations •••••••••• 0 ••••• 0 •

Standard Identification of Bushing Current Transformers •••••• 0 •

Typical Schematic Diagram showing Terminal and Interconnection De signations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

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8

9 10 11 12 12 12 12 13 14 14

14 14

14

15 15 15 15 16

16 16

17

18 18 18

20

21 22 23 24 25 26 27 28 28 28 29 30

30

9-~

9-8 9-9

9-10

9-11 10-1 10-2 10-3

10-4 10-5 10-6 10-7

10-8 10-9 10-10 10-1 1

10-12 10-13

10-14 10-15

10-16 10-17

10-18 10-19

10-20 10-21 10-22 10-23

10-24 10-25

12-1 12-2 12-3 12-4

Proper Location of Mechanism with Respect to Breaker Bushings •• Example of Circuit Arrangement in Functional Sequence •••••••• Typical Power Switchgear AC Schematic Diagram (Using Both­Terminal and Wire Designations) ••••••••••••••••••••••• Typical Power Switchgear DC Schematic Diagram (Using Both Terminal and Wire Designations) ••••••••••••••••••••••• Typical Industrial Control Schematic Diagram •••••••••••••• Viewing Directions - Typical for Chassis-Type Equipment •••••• Viewing Directions - Typical for Cabinet Type of Equipment •••• Representation of Terminals Occurring in Planes not Parallel to thp Moun ting Surface ••••••••••••••••••••••••••••••••• Representation of Terminals on Terminal Boards or Strips •••••• Device or Part Rating, Type, Range, Scale Indication ••••••••• Methods of Showing Passage of Connecting Lines Through Holes •• View of Typical Cable Section Showing Regular and Series of Additional Stitches •••••••••••••••••••••••••••••••• Graphic Symbols Commonly Used on Connection Diagrams •••••• Typical Point-to-Point Connection Diagram •••••••••••••••• Typical Point-to-Point Connection Diagram and Notes ••••••••• Methods of Indicating Feed Line Wire Data and Destinations on Highway or Cable Connection Diagrams ••••••••••••••••••• Typical Highway or Cable Connection Diagram •••••••••••••• Typical Highway or Cable Connection Diagram - Relay and Control Panel (See Also Figure 10-14) •••••••••••••••••••••••• Internal Connection Diagrams for Figure 10-13 •••••••••••••• Typical Highway or Cable Connection Diagram - Breaker Mechanism Housing ••••••••••••••••••••••••••••••• Typical Highway or Cable Connection Diagram •••••••••••••• Explanation and Application of Base-Line Connection Diagram Nomenclature and Method. Using a Portion of a Typical Diagram. (Basically the Same for Feed-Line Method, see Figure 10-18) •••• Typical Feed-Line Connection Diagram •••••••••••••••••• Typical Base Line Connection Diagram (For Associated Schematic, see Figure 8-17) ........••.•..•....•............. Typical Base Line Connection Diagram •••••••••••••••••• Comprehensive Method of Tabulating Wiring Conditions •••••••• Diagram Showing Relative Location of Items in an Equipment •••• Typical Connection - Diagram - with Tabulation for those Connections Not Shown Diagrammatically ••••••••••••••••• Pigtail Component Entries in a Typical Tabular Listing ••••••• Comparison of Tabular and Pictorial Forms of Connection Diagram for the Same Assembly ••••••••••••••••••••••••••••• Typical Electron Tube Basing or Terminal Diagrams •••••••••• Typical Semiconductor Device or Terminal Diagrams ••••••••• Typical Relay Terminal Diagram ••••••••••••••••••••••• Typical Packaged Circuit Terminal Diagram •••••••••••••••

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34 35 40 41

42 42 43 44

45 46 47 48

49 50

51 52

53 54

55 56

57 58 59 60

61 62

63 68 68 69 69

USA STANDARD DRAFTING PRACTICES

Electrical and Electronics Diagrams

15-1 Scope This standard contains definitions and general

information applicable to most of the commonly used Electrical and Electronics Diagrams. It also includes detailed recommendations on preferred practices for use in the preparation of Electrical and Electronics Diagrams. The recommended practices covered by this standard are ground rules designed to eliminate divergent Electrical and Electronics Diagram drafting techniques. The illustrations shown represent good drafting practices. They are not intended as engineering design guides.

15-2 Definitions The following diagram definitions have been

adopted as standard.

15-2.1 Sitlgle-Lille or One-Litle Diagram A diagram which shows, by means of single

lines and graphic symbols, the course of an elec­tric circuit or system of circuits and the com­ponent devices or pacts used therein.

1

15-2.2 Schematic or I: h-melliary l)iagram A diagram which shows, by means of graphic

symbols, the electrical connections and function s of a specific circuit arrangement. The Schematic Diagram facilitates tracing the circuit and its functions without regard to the actual physical size, shape, or location of the component device or parts. (See 15-8.10 for Schematics prepared for maintenance purposes.)

15-2.3 CmlllectifJll or Wirillg l)iagram A diagram which shows the connections of an

installation or its component devices or parts. It may cover internal or external connections, or both, and contains such detail as is needed to make or trace connections that are involved. The Connection Diagram usually shows general physical arrangement of the component devices or parts.

15.2.4 IlIttirCfHlIJtiction Diagram A form of Connection or Wiring Diagram which

shows only external connections between unit as­semblies or equipment. The internal connections of the unit assemblies or equipment are usually omitted.

USA STANDARD DRAFTING PRACfICES

15-2.5 Terminal Diagram A diagram relating the funcuor ally ~epicted

internal circuit of an item or device to Its term­inal physical configuration, and locating the terminals with respect to the outline or orienta­tion markings of the item.

15-2.6 Other Terms In various portions of the electrical and elec­

tronics field, long standing usage of a few terms has varied widely.

A DEVICE in the electric power field is often a PART in the electronics field; generally these are elemental circuit items such as fuses, meters, relays, resistors, or switches. In this sense, PAR T has a specific meaning different from the usual dictionary definition implying a portion.

COMPONENT is ambiguous, for it (a) has long established usage meaning a

PART in the electronic sense, (b) has been defined as a subassembly (one or

more circuits made up of devices or parts), and

(c) also means a subsystem or a system (for example, a power supply).

EQUIPMENT in this standard implies an as­sembly of devices designed to perform one or more specific independent or operational func­tions; it includes units, sets, and systems.

ITEM is used in the usual dictionary sense. COMPONENT DEVICE in this standard is ap­

plied to parts, devices, apparatus, assemblies, or units.

15-3 General In formation The following sub-paragraphs cover basic ma­

terial which is applicable to all diagrams.

15-3.1 Other Reference Standards The following other standards are referenced

in various sub-paragraphs of this ~tandard. When the issues listed below are superseded by a re­vision approved by the issuer, the revision shall apply.

1 USA Standards Institute, New York, New York

USA Standards' C6.1-1956- Terminal Marking for Electrical

Apparatus C37 .2-1962 - Manual and Automatic Station

Control, Supervisory, and Associated Tele­metering Equipments

C37 .11-1957 - (RI962) Requirements for Power Circuit Breaker Control

C37 .20-1965 - Switchgear Assemblies Including Metal Enclosed Bus

C42 (various sections) - Definition of Elec­trical T enns

C83.1-1956-Color Coding for Numerical Values of Components for Electronic Equipment

Y14 - Drafting Manual YI4.1-1957 - Section I-Size and Format YI4.2-1957 - Section 2 - Line Conventions

Sectioning, and Lettering Y32.2-1962 - Graphic Symbols for Electrical

and Electronic Diagrams Y32.2a-1964 - Supplement No.1 to Y32.2-1962 Y32.14-1962 - Graphic Symbols for Logic Dia­

grams Y32.16-1965 - Electrical and Electronic Ref­

erence Designations Z32.13-1950 - Abbreviations for Use on Draw­

ings

IEEE Standards 2

260 Symbols for Units NEMA Standards 3

ICl-1965- Industrial Control SG4-1963 - High Voltage Power Circuit Breakers SG5-1959 - Power Switchgear Assemblies

The text hereinafter may reference these other standards in brief fonn; for example:

USA Standard Y32.2 orNEMA Standard ICI.

When this standard is used as a U.S. MiIital)' requirement, for those topics covered by separate USA and Military Standards, the equivalent ap­proved U.S. Military Standard shall be used ip lieu of the specified USA Standard. 4

21nstitule of Electrical and Electronics Engineers, Inc., New York, New York

3National Electrical ManufActurers Association, Inc., New York, New York

4As of the date of this Standard: In lieu of USA Standard Use Y14, Y14.1

Y14.2 MIL-5TD-IOO

Y32.2

Y32.14

Z32.13

MIL-STD-lS-l

MIL-5TD-806 or MIL-STD-OOB06 (NAVY) as applicable

MIL-5:rD-12

2

~. '")

ELECTRICAL AND ELECTRONICS DIAGRAMS

15-3.2 Diagram Titles When a diagram takes the form of one of the

types defined in 15-2, the name of the type of diagram should be included in the title. For ex­ample: SINGLE-LINE DIAGRAM (not DIAGRAM, LINE, SINGLE).

15-3.3 Combined Forms 0/ Diagrams Many Schematic Diagrams become more useful

when they include pertinent wiring information; many Interconnection Diagrams gain in utility when part or all of the connections within in­dividual units are shown. Prov ided approved standards are observed, combined forms of dia­grams may be used when the net result is helpful to the user. When this principle is applied, how­ever, the diagram title should still conform to the requirements of 15-3.2, the title being selected on the basis of the major purpose of the diagram.

15-3.4 Drawing Size and Format Drawing sizes and formats used with diagrams

shall conform with USA Standards Y14.1. In general, the smallest size standard format com­patible with the nature of the diagram should be selected. When interrelated diagrams are sec­tionalized and prepared on different drawings, or as multiple sheet drawings, suitable cross ref­erences should be provided. Separate sheets of multiple sheet drawings should be the same size.

15-3.5 Line Conventions and Lettering The selection of line thickness as well as

letter size should take into account size reduc­tion or enlargement, when it is felt that legibility will be affected. A line of medium thickness is recommended for general use on diagrams. A thin line may be used for brackets, leader lines, etc. When emphasi s of special features such as main or transmission paths is essential, a line thick­ness sufficient to provide the desired contrast may be used. Line thickness and lettering used with diagrams shall, in general, conform with USA Standard Y14.2 and local requirements to facilitate microfilming. Line conventions, rela­tive thickness and suggested applications for use on Electrical and Electronics Diagrams are shown in Figure 3-1.

15-3.5.1 Lower Case Letters When necessary (to avoid ambiguity) to in­

dicate or distinguish between upper and lower case letters that appear on an item or in a national standard, any of the following alterna­tives shall be used:

(a) Lower case letters (enlarged, when necessary, for proper reproduction). (b) Upper case letters followed by asterisks (for example, A* signifies a, A*BC* signifies aBc, etc.).

3

(c) Upper-case letters, underlined. The meaning of the asterisk or underline shall be explained in a drawing note.

LINE LINE APPLI CA TI ON THICKNESS

FOR GENERAL USE MEDIUM

MECHANICAL CONNECTION: MEDIUM SHIELDING

t & FUTURE ---CIRCUI S LINE

BRACKET-CONNECTING MEDIUM ---DASH LINE

BRACKETS. LEADER THIN USE OF LINES. ETC. THESE LINE THIN THICK- MECHANICAL-GROUPING NESSES BOUNDARY LINE OP-TIONAL THICK

FOR EMPHASIS

FIGURE 3-1 LINE CONVENTIONS FOR DIAGRAMS

15-3.6 Graphic Symbols Graphic symbols used for diagrams shall con­

form with USA Standard Graphic Symbols for Electrical and Electronics Diagrams, Y32.2, or other national-level standards if the symbol is not covered in the USA Standard. If no suit­able symbol exists, any special symbol used shall be explained by a note on the diagram. Symbols or parts of symbols (except letters and numbers) which lend themselves to being rotated or reversed may be so oriented for simplification of circuit layout. The terminal symbol (0) may be added as required to any of the basic symbols. Graphic symbols may be drawn to any propor­tional size that suits a particular diagram, pro­vided the selection of size takes into account the anticipated reduction or enlargement. For most diagrams intended for manufacturing pur­poses, or for ultimate use in a reduced form (2.5 to 1 max.), it is recommended that symbols be drawn approximately 1.5 times the size of those shown in the USA Standard Y32.2. The use of a symbol in the illustrations of this standard does not preclude the use of alternatives shown in Y32.2.

15-3.6.1 Representation of Electrical Con­tacts

Switch symbols shall be shown in the position of no applied operating force. For switches which may be in anyone of two or more positions with no operating force applied or switches actuated

USA STANDARD DRAFTING PRACTICES

by some mechanical or electrical means, a draw­ing note shall identify the functional phase shown in the diagram. Relay contacts shall be shown in the de-energized or nonoperated condition.

15-3.7 Abbreviations Abbreviations used on diagrams should con­

form with USA Standard Abbreviations for Use on Drawings, Z32.13, or other national-level standards if the abbreviation is not covered in the USA Standard. If no suitable abbrevia­tion exists, a special abbreviation may be used, but must be explained by a note on the diagram.

15-3.8 Layout of Diagrams The layout of diagrams shall be such that the

main features are prominently shown. The parts of the diagram should be spaced to provide an even balance between blank spaces and lines. Sufficient blank area should be provided in the vicinity of symbols to avoid crowding of notes or reference information. Large spaces, however, should be avoided, except that space provision may be made for anticipated future circuits if deemed necessary.

15-3.8.1 Grouping of Parts When a circuit contains parts which need

be shown grouped, the grouping may be indicated by means of a boundary (phantom) line enclosure. The phantom line enclosure may be omitted if sufficient space is provided between parts. Typ­ical groupings are unit assemblies, subassem­blies, printed circuits, hermetically sealed units, contactor parts, relays, etc. The dash line used to indicate shielding also implies that the parts enclosed by the dash line are grouped.

15-3.9 Drawing Number Reference Location When diagrams are reproduced for instruction

book or similar purposes, it may be desirable to retain the original drawing number within the reproduced area. This drawing number(if included) should be shown close to the lower right edge of the diagram, in a lettering size comparable to that used for notes and other detailed reference material.

15-}.10 Diagram Revisions Provisi09 shall be made on all types of Elec­

trical and I Electronics Diagrams for recording revisions. The record of changes made in each revision shall be identified by either a number, letter or character and the date of the revision. When it is possible to make a brief detailed ex-

4

planation of the revision, this is desirable. When detailed explanation is not practicable, a re­vision note covering the general nature of the revision should be included. A reference to a change order document may be shown in lieu of an explanation.

15-3.11 Wire Color Information Wire colors may be indicated by giving either

color designations or numerical color codes. In­dication of color designations is preferable when many colors and color combinations such as BK-W are to be shown. When numerical color codes are used, care should be taken to avoid confusion with other numerical references. Recom­mended single and two letter color designations for use specifically on diagrams and correspond­ing color identifications by numerical code are as follows:

Wire Numerical Color Designation Code

(USAS Z32.13) (USAS C83.1) Black BK 0 Brown BR 1 Red R 2 Orange 0 3 Yellow Y 4 Green G 5 Blue BL 6 Violet V 7

(Purple) (PR)" Gray (Slate) GY (S) 8 White W 9

15-4 Single-Line Diagrams, General The Single-Line Diagram conveys basic in­

formation about the operation of a circuit or a system of circuits, but omits much of the de­tailed information usually shown on Schematic or Connection Diagrams. This form of presenta­tion lends itself to simplified diagrams of com­plex circuits and to diagrammatic representa­tion of communication or power systems, in which a single line represents a multi conductor comml1nication or power circuit.

15-5 Single-Line Diagrams (Electronics and Communications)

Figure 5-1 is a typical Single-Line Diagram applied to a complex audio system. In gen eral, the practices established in 15-7 apply equally well to the preparation of Single-Line Diagrams.

~ ... '.)

ELECTRICAL AND ELECTRONICS DIAGRAMS

POWER AMPLIFIERS

REFERENCE

H TAloKBACK

MICROf>HONe

TALKBACK CHANNEL

TEST

TERMINALS FOATEST

LOUDSPEAI<EAS

MONITOR LOUOSPEAKER

FIGURE 5-1 - TYPICAL SINGLE-LINE DIAGRAM (ELECTRONICS AND . COMMUNICATIONS

15-6 Single-Line Diagrams (Power Switchgear and Industrial Control)

The following sub-paragraphs contain detailed information specifically applicable to Power Switchgear and Industrial Control Single-Line Diagrams. This material is to be used as a sup­plement to the general standards of 15-4.

15-6.1 General In/ormatio,z The Single-Line or One~Line Diagram is a key

diagram showing the overall relationship between circuits and their component devices or parts. Only a single line is used to show an AC or DC sy stem as illustrated in Figure 6-1. Thick con­necting lines indicate primary circuits. Medium connecting lines indicate the connections to the current and potential sources. Small circles por­tray relays, meters and instruments, and small rectangles depict resistors, transfer and selector switches. Power circuit devices and relays are identified by device function designations (USA Standard C37.2); meters, instruments and switches by abbreviations and letter com­binations (refer to 15-3.6 and 15-3.7).

15-6.2 Contents A Single-Line Diagram shows connections of

major equipment, protective relays, meters, and instruments. Consideration shall be given to inclusion of the following information:

5

600 A 1500 MVA

~~--------------------~ W

FIGURE 6-1 - PORTION OF A TYPICAL SINGLE-LINE DIAGRAM

15-6.2.1 Ratings

LINE

Ratings which are essential to an overall understanding of the system shall be included. Detailed ratings should be stated on the Con­nection Diagram. Generator ratings, for example, include: kilowatt capacity, power factor, voltage, number of phase windings, cycles and revolu­tions per minute as shown in Figure 6-2.

NOTE: Industrial Control Single-Line Diagrams may omit equipment ratings when they are used as standard drawings applying to more than one rating.

USA STANDARD DRAFTING PRACTICES

6) ~ GEN 30000 KW 0.85 PF 13.8 KV 3 PH 60 CIS .3600RPM

FIGURE 6-2 - TYPICAL GENERATOR RATINGS

15-6.2.2 Winding Connection Symbols Winding connection symbols should be shown

for all power equipment. Typical wye connections and wye-delta connections of a transformer are indicated in Figure 6-3.

'I~

T FIGURE 6·3 - TYPICAL WINDING SYMBOLS

When it is desirable to use the winding con­nection symbols as phasors this should be so noted and the phase rotation and sequence in­cluded. Note that the delta-wye symbols of the transformer and the "Y" symbol of the gen­erator in Figure 6-4 have been properly oriented for the system relationships.

35000 KVA 115-13.2 KV 3 PH 60 CIS

GEN 30000 KW 0.85 PF 13.8 KV 3 PH 60 CIS 3600 RPM

FIGURE 6-4 - TYPICAL ORIENTED GENERATOR AND TRANSFORMER PHASOR SYMBOLS

15-6.2.3 Neutral and Ground Connections The neutral and ground connections should

be shown for all power circuits as indicated in Figure 6-5.

'I~

T 35000KVA 115-13.2 KV 3PH 60C/5

FIGUR E 6-5 - TYPICAL TRANSFORMER NEUTRAL GROUND SYMBOL

6

15-6.2.4 Feeder Circuits When available the rating and type of load

should be stated for each feeder circuit as il­lustrated in Figure 6-6.

BUS

3-300/5

FEEDER NO.1 - 480V 1500 KVA LOAD CENTER

FIGURE 6-6 - TYPICAL MARKING OF FEEDER CIRCUIT LOAD

15-6.2.5 Protective Relaying Show the operating source, current or poten­

tial, or both, by connecting lines or by notes for each relay which functions as a protective device. See Figures 6-7, 6-11, 6-12 and 6-13.

2-14400-120

~------------------------~40

FIGURE 6-7 - TYPICAL PROTECTIVE RELAY CONN ECTIONS

15-6.2.6 Instruments, Meters and Associated Switches

Show the operating source, current or po· tential, or both, by connecting lines or by notes for each device. See Figures 6-8, 6-11 and 6-12.

EL ECTRICAL AND ELECTRONICS DIAGRAMS

FIGURE 6-8 - TYPICAL INSTRUMENT AND METER CONNECTIONS

15-6.2.7 Power Circuit Breaker Mechanism Indication of the mechanism end of the power

circuit breaker may be shown to permit proper orientation of bushing current transformers. See Figure 6-9 (shown below), and 15-9.1.6.

FIGUR E 6-9 - ILLUSTRATION SHOWING CIRCUIT BREAKER MECHANISM SYMBOL

15-6.2.8 Ratios of Instrument Transformers Current transformers should show the number

of transformers and the ampere ratio; Figure 6-10(A). For current transformers with multiple ratios, the connected ratio should also be in­dicated; Figure 6-10(B). If only one or two trans­formers are present in a three-phase system, the phase location of these transformers should also be shown; Figure 6-10(C).

7

(A)

3-200/5

( B)

3-600/5 CONN 200/5

(C)

1-14400-120 PH-I

~t-

FIGURE 6-10 - TYPICAL INSTRUMENT TRANSFORMER

SYMBOLS AND MARKINGS

15-6.3 General Layout The arrangement of the diagram should be made

to give the utmost in clarity. The following re­quirements shall be observed in the preparation of the diagram:

15-6.3.1 Graphic Symbols Symbols for Single-Line Diagrams are in­

tended to indicate the operating functions. These symbols are shorthand graphic representations and are not necessarily intended to represent the physical likeness of the device nor contain com­plete electrical connections. Graphic symbols shall be applied as described in 15-3.6.

15-6.3.2 Abbreviations Abbreviations shall be applied as described

in 15-3.7.

15-6.3.3 Device Designations Device designations shall be applied as

described in 15-9.2.3.

15-6.3.4 Course of Main Circuits Course of main circuits should be shown in

the most direct path and logical sequence. In­formation in 15-7.1 also applies to the Single­Line Diagram.

USA STANDARD DRAFTING PRAcrICES

15-6.3.5 Horizontal and Vertical Lines Lines between symbols should be horizontal

or vertical with a minimum of line crossings, and with spacing to avoid crowding. Information in 15-7.2 also applies to the Single-Line Diagram.

15-6.3.6 Voltage Arrangement The arrangement of the diagram should pref­

erably show the higher volta~es at top or left of

the drawing and successively lower voltages towards the bottom or right of the drawing.

15-6.4 Typical Single-Line Diagrams Typical Single-Line Diagrams that illustrate

good drafting practice are shown in Figure 6-11, 6-12 and 6-13. The choice between Figure 6-11 and Figure 6-12 is optional.

II~ KV BUS

87T

87G

2-14400-120

GEN 30000KW 0.8~ PF 13.8 KV 3PH 60 CIS 3600 RPM

EXC 125KW 250V

t:-.=;--Q ~ ,,00 G RES

:hI: 3-II~OOO-1I5

SYN

600A 1500MVA

BUS --... -----·D�FF

~1-664.00-115

E-t-+ PHI II...... W

LINE 1 fll SYN

't' GEN NEUTRAL

FIGURE 6-11 - TYPICAL POWER SWITCHGEAR SINGLE-LINE DIAGRAM WITH COMPLETE DEVICE DESIGNATIONS

8

3-600/5 CONN 400/5

GEN 30000 KW 0.85 PF 13.8 KV 3PH 60CIS 3600 RP~

ELECTRICAL AND ELECTRONICS DIAGRAMS

t"C"

1"0" t "b" 2-14400-120

~;;'W'WH'V'A E--QREG

2 -14400-120

I T

EXC

11;;t 5-115000-115

lv.s.w.V.A.WH

_t _______ ~5KW250V~ ¥ 0 -0

RES - REG

f"O"

IISKV BUS

3-600/5 CONN 20015

600A I500MVA

3-600/5 CONN 20015

3-600/5 CONN 600/5

W, VAR,WH,A

~-66400-115PHI

f-f-'II II....... lL

LINEI cb S

o INSTRUMENTS

® RELAY

"0" GEN OIFF

"b" TRANS OIFF

.. c .. BUS OIFF

""tl GEN NEUTRAL

"d" OIR GRO

FIGURE 6-12 - TYPICAL POWER SWITCHGEAR SINGLE-LINE DIAGRAM WITH ABBREVIATED DEVICE DESIGNATIONS

9

1 400A

2-600/5

A

USA STANDARD DRAFTING PRACTICES

5KV-220V

LCONTROL ~CIRCUIT

225A

2-200/5

M

I 5 KV

5KV-220V

LCONTROL ~CIRCUIT

1000 HP

FIGURE 6-13 - TYPICAL INDUSTRIAL CONTROL SINGLE-LINE DIAGRAM

10

ELECTRICAL AND ELECTRONICS DIAGRAMS

15-7 Schematic Diagrams, General The following subparagr~phs contain general

information for use in the preparation of Sche­matic Diagrams.

15-7.1 Layout The Schematic Diagram shall use a layout

which follows the circuit, signal, or transmission path either from input to output, source to load, or in the order of functional sequence. Long inter­connecting lines between parts of the circuit should be avoided. Draw similar basic circuits in a similar form (this does not prevent the use of simplified drafting practice to depict re­peated circuits).

15-7.2 Connecting Lines Connecting lines should be drawn with as few

bends and crossovers as possible. Except for such circuits as "multi-vibrators" and "bridges," connecting lines and the symbols joined by them should be drawn horizontally and vertically.

15-7.2.1 Spacing Spacing between parallel lines after reduc­

tion to ultimate use size (see 15-3.6) shall be a minimum of 0.06 inch. The longer parallel lines shall be arranged in groups, preferably three to a group, with approximately double spacing between groups; see Figure 7-3. In determining the group­ing, functional relation of the lines should 'also be considered.

15-7.2.2 Junctions and Crossovers All junctions of connecting lines should be

shown as single junctions, as shown in Figure 7-1(A), the preferred method, or Figure 7-1 (B). Figure 8-17 illustrates the practice of Figure 7-1(B). When layout considerations prevent the exclusive use of the single junction methods of Figure 7-1(A) or 7-1(B), multiple junctions may be shown as in Figure 7-1(C). Figure 7-1(D) il­lustrates the use of both the nno-doe' single junction and "dot" multiple junction methods in an array of lines where spacing precludes the exclusive use of the ctno-dot" single junction method of Figure 7-1(A)

15-7.3 Interrupted Paths Connecting lines, whether single or in groups,

may be interrupted at convenient points and iden­tified, with the destination indicated. Letters, numbers, abbreviations, or other identifiers for interrupted lines shall be located as close as possible to the point of interruption.

11

-f+ SINGLE JUNCTION II NO DOT· METHOD

(A)

CROSSOVER (NO JUNCTION)

++ SINGLE JUNCTION CROSSOVER "DOT- METHOD (NO JUNCTION)

(B)

+ + MULTIPLE JUNCTION CROSSOVER

(NO JUNCTION)

NO DOT (C)

CONNECTION

" SINGLE "NO DOT- AND MULTIPLE -DOT­

JUNCTION APPLICATION

(D)

FIGURE 7·1 - JUNCTIONS AND CROSSOVERS

15-7.3.1 Interrupted Single Lines For single interrupted lines, the line identi­

fication may also serve to indicate destination as shown in Figure 7-2 for the power and filament circuit paths. In general, identification practice for single interrupted lines shall be the sam e as for grouped and bracketed lines described in 15-7.3.2.

USA STANDARD DRAFTING PRACTICES

+300V

+300V DC ( • +300V REGULATED

-ISOV DC ( • -ISOV REGULATED

6.3V [< X eoCy ( y

FRAME ( t CIRCUITGRO ~

-ISOV

CONNECTOR INPUT CIRCUIT ARRANGEMENT

FIGURE 7-2 - IDENTIFICATION OF INTERRUPTED LINES

15-7.3.2 Intermpted Grouped Lines When interrupted lines are grouped and

bracketed, and depending on whether the lines are horizontal or vertical, line .identifications shall be indicated as shown in Figure 7-3. Bracket destinations or connections may be indicated either by means of notations outside the brackets as shown in Figure 7-3, or by means of a dash line as shown in Figure 7-4. When the dash line is used to connect brackets, it shall be drawn so that it wi II not be mistaken for a continuation of one of the bracketed lines. The dash line shall originate in one bracket and terminate in no more than two brackets.

15-7.4 Afecha'lical Linkages When mechanical functions are closely related

to certain electrical functions, it may be desir­able to link the mechanical components with graphic symbols of the Schematic Diagram. A typical example of how this may be done is shown in Figure 7-5.

ADV J TO TRR TIMING MSG CIRCUITS

TO CONNECTOR

CIRCUIT

/A C E \

I i 0 F

I I

TO TIMING

CIRCUITS

-----B-~J TO CONNECTOR ----0 CIRCUIT -----E ----F

FIGURE 7-3 - TYPICAL ARRANGEMENT OF LINE IDENTIFICATIONS AND DESTINATIONS

~T:} __ -{~:NS ____ ~AN_S~ _T~A ___ _

FIGURE 7-4 - TYPICAL INTERRUPTED LINES INTERCONN ECTED BY DASH LIN ES

FIGURE 7-5 - TYPICAL SCHEMATIC DIAGRAM SHOWING MECHANICAL LINKAGES

12

ELECTRICAL AND ELECTRONICS DIAGRAMS

15-S Schematic Diagrams (Electronics and Com­munication)

The following subparagraphs contain detailed information which is specifically applicable to Schematic Diagrams of the type used with elec­tronic and communication equipment. This ma­terial is to be used as a supplement to the gen­eral standards of 15-7.

15-S.1 Layout In general, Schematic Diagrams should be ar­

ranged so that they can be read functionally from left to right. Complex diagrams should generally be arranged to read from upper left to lower right, and may be laid out in two or more layers. Each layer should be read from left to right.

The overall result shall be a circuit layout which follows the signal or transmission path from input to output, or in the order of functional sequence. Where practical, terminations for ex­ternal connections should be located at the outer edges of the circuit layout.

15-S.2 Drawing Zones Zones (coordinates) should be shown on a com­

plex Schematic Diagram to aid in the location of specific items; see Figure 8-19. If a Schematic Diagram is prepared mainly for maintenance pur­poses and is likely to be reproduced in a tech­nical manual or its equivalent, it is preferred that the coordinate system begin in the upper left. This preference is based on beginning the reference designation suffix number assignment from the same area on the Schematic Diagram (see 15-8.6). However, when the diagram is pre­pared on a zoned drawing format, the format zones may be used.

15-8.3 Circuit Return and Connection Symbols For the application of circuit return symbols

-III, -- [2, --., ----C>*,seeFigure 8-22. The - ..,.symbol should be used when there is a specific potential difference with respect to a potential reference level, and the --t> *sym­bol should be used when the common connections are at an unspecified potential level. Asterisks shall be replaced in accordance with USA Stan­dard Y32.2.

15-S.4 Terminals Terminal circles should be omitted unless re­

quired for clarification. See switch SI in Figure 8-19 for a typical application of the standard terminal symbol to a complex switch. For pre­ferred terminal representation of spring contacts for relays, jacks and key switches, see Figure 8-17, graphic symbols J 1, SI, Kl. When terminal symbols are omitted from the terminations of a part, or an enclosed or shielded group of parts, terminal markings should be placed immediately outside the enclosure. See parts T2, T3, T4, T5,

13

T7, and T8 of Figure 8-19 for examples of term­inal markings.

15-8.4.1 Identification of Terminals (General) Terminal identifications shall be added to

graphic symbols to indicate actual physical mark­ings which appear on or near part terminations. When the terminals of parts (such as relays, switches, or transformers) are not shown or marked on the part, number or letter identifica­tions should be arbitrarily assigned. This prac­tice will facilitate use of the circuit information for Connection Diagram preparation and circuit testing. When terminal identifications are arbi­trarily assigned, the Schematic Diagram should include an explanatory note (see Figure 8-17, note 4) and a simplified terminal orientation dia­gram which relates assigned symbol terminal nomenclature to functional markings on the equip­ment and physical features of the part. For ex­amples of terminal numbering and simplified term­inal orientation diagrams for the drawing note, see Figures 8-1,8-2,8-3,8-17, and 8-19.

When terminals or leads of multilead parts are identified on the part by a wire color code, letter, number or geomeuic symbol, this identifi­cation shall be shown on or near the connecting line adjacent to the symbol. For an example, see transformer TIO (color of leads) and capacitor C40 (geometric symbol) of Figure 8-19.

10

40 :::J 3 0 o 6

03 ....... VIEWED 2 O{~O 5 FROM

06 REAR

10 o 4

SYMBOL ON TERMINAL SCHEMATIC ORIENTATION DIAGRAM DIAGRAM

ASSOCIATED WITH NOTE

FIGURE 8-1 - TERMINAL IDENTIFICATION EXAMPLE - TOGGLE SWITCH

SYMBOL ON SCHEMATIC DIAGRAM

TERMINAL ORIENTATION

DIAGRAM ASSOCIATED WITH NOTE

FIGURE 8-2 - TERMINAL IDENTIFICATION EXAMPLE - ROTARY SWITCH

USA STANDARD DRAFTING PRACTICES

51

(014~ ~SRI (A)

'o--z-r; ~4

' O-----V t ~' aFF I~ ~2 ~ ~

, OPR " tel POS z t~ Is)

, o 1

c

51

0 0 0

0 0 0

0 0 0

0 0

0

0

0

0

0

, 1 A , , , , B , ,

TL ___ '"0",----1

SYMBOl ON SCHEMAT IC DIAGRAM

OF KEY

T ERMINAL END

ORIENTATION DIAGRAM ASSOC IATED WITH NOTE

aPR pos 2

OFF aPR

pos I

OPERATING END

FIGURE 8-3A - TERMINAL IDENT I F ICATION AND ORIENTAT ION TYPICAL LEVER SWITCH (K EY )

TERM!NAL QUAORANT REFERENCE

-.............-MOVEMENT OF r---. --........ LEVER

KEY l OP

LETTERS - ",---11- -1-- -CODE MARKING

OUADRANT TERMINAL NUMSERING SEOUENCE Q

OUT WARD FROM ___ 2 I· CENTER OF KEY /'

(FRONT or 1\£ '1')

j CEN1"E R OF KEY

FIGURE 8-3B - RELAT IONSHIP OF KEYTOP FRONT AND SPRING TE RMINA L QUADRANTS

TYPICAL LE V ER SWITCH (KEY )

15-8.4 .1.1 Adjus ta ble Resi stor Terminal Identification

When rotary type adjust able resi s tors are s hown on Schematic Diagrams, it is often de­s irable to indicate direction of rotation. For indicating direction o f rotation, it i s cu stomary to refer tb the rotary motion as clockwi se or counterclockwise when rotation i s viewed from the knob or actuator e nd of the control. The preferred method of terminal identification is to des ign ate with the lett ers "CW" th e terminal ad­jacent to th e movable coneact when it i s in an extreme clockwise posicion. Thi s method is

14

s hown in F igure 8~4(A). If device terminal s are not marked, numbers may al so be used with the resis tor symbol, wherein number 2 is ass igned to the adjusta ble contact as shown in Figure 8 ~ 4( B ) . Additional fixed taps may be numbered s equentially , 4,5, etc., a s shown in Figure 8~4(C).

cw ew 3 2

(A) (8)

cw 3

5 2

4

(e)

FIGURE 8-4 - TERMINAL IDENTIFICATION EXAMPLE - ADJUSTABLE RESISTOR

1 5 ~8 .4 .1.2 Switch Terminals and Circuit FnnctioTl s

The relation o f swi tch position to circuIt function sha ll be shown on Schematic Diagram s. For simple toggle s witches, it may be sufficient to identify posicion with notations such as ON­OFF. For more complex switches, position~[o­function relations may be s hown either near th e s witch symbol or a c a more conveni ent location on the d rawi ng . Figure 8-5 shows how either form o f representa tion may be used fo r a multi po si­cion rotary s witch.

When rotary switches perform involved function s such as thos e ill usttated in Figure 8-6, the tabular form of presenting supplementary in­fo rm ation is preferred. In t abular listings, dashes link the terminals tha t a re connected. Fo r exam­ple, in posit ion 2 of Figure 8 -6, termin als I and 3 are co nnec ted, as a re terminals 5 and 7 , and 9 and 11. For an additional example of thi s method, see Note 4 of Figure 8-19 ·

5 1 VOLTAGE

O~6-c+=4~5a~V~U~N~R~'=G __ _ S +300V UNREG

a TEST 4 +J50V REG

); :"3,_F-,-+.::100,,,-,V_ R:':':O:G::..._

FUNCTIONS SHOWN AT SYMBOL

FUNCTIONS SHOWN IN T ABULAR FORM

FIGURE 8-5 - POSITION-FUNCT ION RELATIONSHIPS FOR ROTARY

SWITCHES (OPTIONA L METHODS)

ELECTRICAL AND ELECTRONICS DIAGRAMS

51 REAR

12

"~ ;o_~r~':3 8~, '04

7 5 6

(SWITCH VIEWED FROM FRONT)

SYMBOL ON SCHEMATIC DIAGRAM

POS

I

2

3

51 (REAR)

FUNCTION TERM.

OFF(5HOWN) 1-2,5-6.9-10

STANDBY 1-3,5-7,9-11

OPERATE 1-4.5-8.9-12

FUNCTIONS SHOWN IN TABULAR FORM

FIGUR E 8-6 - POSITION-FUNCTION RELATIONSHIPS FOR ROTARY

SWITCHES (TABULAR METHOD ONLY)

15-8.4.1.3 Electron Tube Pin Identification Tube pin numbers shall be shown outside

the tube envelope and immediately adjacent to the connecting line, as shown in Figure 8-7.

6

FIGURE 8-7 - TERMINAL IDENTI FICATION -ELECTRON TUB E PINS

15-8.4.1.4 Connector Coaxial Contact Identification

In showing and identifying contacts of coaxial connectors, the Single-Line Diagram representation of Figure 8-8 is preferred. The complete diagram representation of Figure 8-9 may be used when it is essential to show shield continuity.

I )>--+----+--e~

2 )>--+-----

3 »)--10-----OR

FIGURE 8-8 - SINGLE-LINE DIAGRAM REPRESENTATION

15

.; 1

2) I I I

3) I ,

Q OR

2

3

FIGURE 8-9 - COMPLETE DIAGRAM REPRESENTATION

15.8.4.1.5 Integral Circuit Package, Cir­cuit Pack or Subassembly Terminations

These terminations usually fall into one of the three types shown on the left side of Figure 8-23. The recommended circuit schematic representation for each of the termination methods is shown adjacent, to the right, of the physical arrangements. While use of the mechanical­grouping boun~ary line is shown to be optional for arrangement 8-23(B), its use ,in this applica­tion is nevertheless recommended whenever possible.

15-8.4.1.6 Circuit Pack Representation in Overall and Other Schematic Diagrams

Circuit packs shown in overall and other Schematic Diagrams may be represented in one of the following ways: (a) Pack circuitry may be repeated in detail and shown enclosed with a mechanical-grouping boundary line in a manner similar to the repre­sentation of ARI in Figure 8-22; (b) Pack circuitry may be represented with spe­cific graphic symbols. This method is recom­mended in place of (a) when pack circuitry readily lends itself to symbolic representation, and the use of such graphic symbols is com­patible with the type of Schematic Diagram to be prepared. An example of symbol application is shown at the right in Figure 8-23. For information on symbols that may be used for this purpose, see USA Standard Y32.2 and Y32.14.

15-8.5 Division 0/ Parts To clarify the circuit layout, portions of multi­

element parts may be separated, with portions of the graphic symbol shown at different locations on the Schematic Diagram.

15-8.5.1 Identification of Parts by Suffix Letter

Subdivisions of parts may be identified by adding a suffix letter to the reference designa­tion of the part. For example, CIA, CIB might identify electrically separate sections of a dual capacitor designated Cl. Suffix letters may also be used to identify subdivisions of a complete part when the individual parts are shown en­closed or are associated as in a compact unit. See crystal unit of Figure 8-10 for an example of this method.

USA STANDARD DRAFTING PRACTICES

YI r-- ----,

-t{: AD, : 0 · L .. B ~

FIGURE 8·10 - IDENTIFICATION OF PARTS BY SUFFIX LETTERS

15-8.5.2 Identification of Rotary Switch Parts When parts of rotary switches are designated

SIA, SIB, SIC, etc., the suffix letters A, B, C, etc., shall start from the knob or actuator end and be assigned sequentially away from this position. Each section of the switch shall be shown viewed from the same end as shown in Figure 8-11. When both sides of a rotary switch section are used to perform separate switching functions, the front (knob or actuator end) and rear symbols should be differentiated by ap­propriately modifying the reference designation, for example, SIA FRONT and SIA REAR. See switch SI of Figure 8-19.

ACTUATOR END

CA) TYPICAL SWITCH SECTION

(BLANK TERMINALS SIA MAY BE ADDED AS At-I REAR AID IN ORIENTATION)).

o 0 o

o ~...c>J o 4 o 0

o 6

SIA FRONT

@-t o 0

~O : 9 00

o 0

(8) GRAPHIC SYMBOL

FIGURE 8-11 - TYPICAL DEVELOPMENT OF A GRAPHIC SYMBOL -

COMPLEX ROTARY SWITCHES

16

PART OF JI

A>-r­B~ G)-1--

11-10~ c FED

(A)

T81 TB.2

00=0. ~ T81 ckkb

(8)

FIGURE 8·12 - IDENTIFICATION OF PORTIONS OF ITEMS

15-8.5.3 Identification of Portions of Items When portions of connectors, terminal boards

or rotary switch sections are functionally sep­arated on the diagram: (a) the words C C P ART OF" may precede the ref­erence designation of the entire portion as shown in Figure 8-12(A) and in Figure 8-19, switch section SIA REAR, or (b) the portion may be shown incomplete as in Figure 8-12(B) with broken line and ccPART OF" omitted.

15-8.5.4 Identification of Individual Term­inals of Parts

When the separation of the pordons of con­nectors or terminal boards on the same drawing becomes extensive, the separated portions may be identified as individual terminals as shown in Figure 8-13. If individual terminals from dif­ferent portions (such as connectors) are inter­mixed, mechanical-connecting lines shall be omitted.

> J2-C .... , J2-A < I I

~ 't' "2-B <

~ P3-4 ~

E P3-1

> J2-F TBt-I 0

~ "2-0 TB2=3 0 P3-5 T"~A 0

~ P3-6 T85-7 0

FIGURE 8·13 - IDENTIFICATION OF INDIVIDUAL TERMINALS

ELECTRICAL AND ELECTRONICS DIAGRAMS

~ 15-8.5.5 Detached Contact (Contact Separa­tion) Methods

Switching circuit functions may be more clearly shown, and bends and crossovers sub­stantially reduced by showing the contacts of switching devices separated from each other and from the operating device (coil). Unused contacts need not be delineated on diagram if listed separately.

In Figure 8-17, relay contacts have been shown spaced from the coils to facilitate under­standing the circuit functions. Mechanical link­age lines shown between elements of multi­element switching devices and reference desig­nations for identifying individual contacts may both be omitted when the association of ele­ments is clear. Functional designations not in­tended to convey surface marking information may be aligned along one edge of the Schematic Diagram instead of being shown at the graphic symbol.

The circuit function presentation of Figure 8-17 may be improved by completely separating the switching device elements as shown in Figure 8-18. The association of the elements is shown by means of" reference designations and contact designations. If the Schematic Diagram is complex, it may be necessary to show the complete graphic symbol of the contacting de­vice elsewhere on the diagram with zone loca­tions of the device elements. In Figure 8-18, the switching function symbols are used instead of the contact symbols shown in Figure 8-17.

15-8.6 Reference Designations Reference designations are combinations of

letters and numbers which identify items shown on the Single-Line or Schematic Diagram. These reference designations serve to identify the same items on related documents, such as the Assem­bly Drawing and Connection Diagram. All graphic symbols of separately replaceable items shall be identified by an appropriate reference desig­nation located as near as practicable to the graphic symbol. In addition, items not separately replaceable may be identified as required. Mount­ing devices for electron tubes, lamps, fuses, etc., are not usually shown or identified on Schematic Diagrams. For application of partial reference designation prefixes see 15-8.10.1. The use Qf reference designations in this Standard conforms to the Unit Numbering Method of Y32.16. The use of other reference designation methods shall conform to the requirements of the particu­lar application, and the method shall be ex­plained.

15-8.6.1 Letters For the selection of reference designation

letters, refer to USA Standard, Electrical and Electronics Reference Designations Y32.16.

17

15-8.6.2 Numbers The number portion of the reference designa­

tion shall follow the letter or letters without hyphen or space and shall be of the same size and on the same line; for example, CI, S14, and MG5. The assignment of numbers should prefer­ably start with the lowest number in the upper left-hand corner of the Schematic Diagram and proceed consecutively from left to right and top to bottom throughout the drawing.

When items are eliminated as a result of a drawing revision, remaining items should not be renumbered. For circuits showing many items, a table may be used to show which numbers are not used and the highest numbered reference designa­tions, as shown in Figure 8-14.

This table may include any or all types of items and shall be located; conveniently near notes or other tabular information.

HIGHEST REFERENCE

DESIGNATIONS

R6S I C3S

REFERENCE DESIGNA TIONS

NOT USED

R 7, R9 I ell, C 14 R60, R62 C19, C23

FIGURE 8·14 - TYPICAL TABLE INDICATING OMITTED AND HIGHE'ST NUMERICAL

REFERENCE DESIGNATIONS

15-8.6.3 Type Designations Electron tubes, semiconductors and other

devices with standard type designations shall be identified by reference designation and type designation. Below the type designation, the circuit function may also be indicated. This in­formation should be located immediately adjacent to the symbol, preferably above it, as shown in Figures 8-15,8-19, and 8-23.

V5 3SC5

OUTPUT Q3

2N335 1ST IF

~7 __ 6

2 === I

V7B 17AU7 DET

~ FIGURE 8-15 - REFERENCE DESIGNATION

TYPE DESIGNATION AND FUNCTION- ' ELECTRON TUBES AND SEMICONDUCTORS

USA STANDARD DRAFTING PRACTICES

15-S.7 Numerical Values Numerical values of resistance, capacitance,

inductance, voltage, etc., should be specified in a numerical form requiring the indication of the fewest ciphers (zeros). This can best be done by using the multipliers of Table S-1 in combination with a basic unit; for typical ap­plications see 15-S.7.2, 15-S.7.3, and 15-S.7.4. In these applications the symbol of method 1 is shown. Method 2 may also be used.

Table 8-1 Multipliers

Symbol

Method Method Multiplier Prefix 1 2

10 '2 tera T T

109 giga G G

106 mega M M (1,000,000)

103 kilo k K (1000)

10-3 milli m MILLI (.001)

10-6 micro p. U (.000001)

10-9 nano n N

10- 12 pico P P

10-15 femto f F

10- 18 at to a A

15-S.7.1 Commas Four digit numerical values shall be shown

without commas. For example, 4700 and not 4,700.

15-S.7.2 Resistance Resistance values should be expressed in

ohms, kilohms or megohms as follows:

Range in Ohms Express as Example

Less than 1000 ohms .031 470

1000 to 99,999 ohms or IS00 kilohms 15,S53

10k S2k

100,000 to kilohms 220k 999,999 or megohms .22M 1,000,000 or mego ms 3.3M more

IS

15-S.7.3 Capacitance Capacitance val ues should be expressed in

picofarads or in microfarads as follows. (The term "picofarad" has replaced the older term C C micro microfarad.")

Range in Picofarads Express as Example

Less than picofarads 152.4pF 10,000 4700j>F 10,000 or microfarads .015p.F more 30p.F

15-S.7.4 Inductance Inductance values should be expressed in

henries, millihenries, or microhenries. For ex­ample, 2p.H should be used instead of .002mH and 5mH should be used instead of .005H or 5000p.H.

15-S. 7.5 Notes To avoid repeating abbreviations of units of

measurement which are generally applicable throughout the diagram, a general drawing note may be used and only the numerical value need be specified on the diagram. A recommended form of the note is: UNLESS OTHERWISE SPECIFIED: RESISTANCE VALUES ARE IN OHMS. CAPACITANCE VALUES ARE IN MICROFARADS.

or CAP ACITANCE VALUES ARE IN PICOFARADS.

An alternative note for specifying capacitance values is:

CAPACITANCE VALUES SHOWN AS NUMBERS EQUAL TO OR GREATER THAN UNITY ARE IN pF AND NUMBERS LESS THAN UNITY ARE IN p.F.

R3 1M

~

-ANY--R3 1M

R3 OR -'VVv--

1M

FIGURE 8-16 - METHODS OF NUMERICAL VALUE AND REFERENCE DESIGNATION PLACEMENT

ELECTRICAL AND ELECTRONICS nIAGRAMS

15-8.7.6 Numerical Value and Reference Designation Placement

Numerical values and reference designations shall be located as near as feasible to the sym­bol. Preferable arrangements are shown in Figure 8-16. Multiplier symbols are shown to indicate multiples of a basic unit.

15-8.8 Functional Identi/icationo/ Parts Some parts may require special functional

identification. Such information may be applied when it will contribute substantially to the read­ability of the circuit. Functional designations which are to be marked on chassis or panel sur­faces shall be shown on the diagram adjacent to the applicable symbol.

15-8.9 Test Points In addition to the reference designation, test

points shall be identified on a diagram, by one of the following methods: (a) with the letters uTP" followed by a number suffix. The number suffix should be assigned on the diagram in sequence for troubleshooting con­venience. (b) with a special distinguishing symbol to in­dicate the test polnt category (for example, major, secondary, or minor). Test points within each category may be identified by designation num­bers or letters. (c) with the test function indicated below the reference designation.

15-8.10 Additional Circuit In/ormation The following additional information, as ap­

plicable, may be included on Schematic Diagrams. When diagrams are specifically prepared for maintenance purposes, as much of this informa­tion as is applicable shall be included. Additional informacion should not be limited to the items noted in this paragraph. DC resistance of windings and coils (if more

than one ohm) Critical input or output impedance values Wave shapes (voltage or current) at significant

points Wiring requirements for critical ground points,

shielding, pairing, etc. Power or voltage ratings of parts Indication of operational controls or circuit

functions Caution notation for electrical hazards at main­

tenance points

19

Circuit voltage values at significant points (tube pins, test points, terminal boards, etc.)

Significant circuit resistance values at desig­nated leference points (information may be in tabular form)

Zones (grid system) on complex Schematics. When technical data is prepared from engineer­ing drawings, zone reference may bet the same.

Circuit element zone locations (on complex Schematics) in tabular form on the drawing or associated document when such location in­formation will facilitate use of the Schematic.

Signal flow direction in main signal paths shall be emphasized.

15-8.10.1 Partial Reference Designation Prefix

When it is necessary that a Schematic Dia­gram convey for maintenance purposes the loca­tion of a part within an overall unit consisting of one or more subassemblies, the notation REF DESIG PREFIX foilowed by an appropriate ref­erence designation prefix shall be used, as shown in Figure 8-22. The notation and prefix shall be placed in the upper left corner of the mechanical­grouping boundary line enclosure of the sub­assembly immediately below or following the subassembly name. By preceding the part or subassembly reference designation, the prefix conveys location within each sub-assembly level of the unit. For example, the reference designa­tions of parts within Al would be prefixed by 3Al, indicating that part is in subassembly Al and that Al is within unit 3. For parts within amplifier ARI, the prefix is 3AIARI. The com­plete locational reference designation for C2 of ARl, for example, would be 3AIARIC2.

IS-8.ll Examples 0/ Schematic Diagrams /or a Complete Item

Figure 8-19 is an example of a conventional Schematic which adequately serves manufacturing purposes.

Figure 8-20 is an example of a schematic wherein each stage is identified for ease in understanding its function. In this form it may be readily converted to add or emphasize mainte­nance information in accordance with 15-8.10, in which case it will be similar to Figure 8-21.

Figure 8-21 is an example of a maintenance schematic in which the signal path is emphasized.

INCOMING TRK CKT

INCOMING TRK CKT

GRD BUS

21 - 26V BAT. BUS

45-S0V BAT. BUS

USA STANDARD DRAFTING PRACTICES

MONItOR POSITION ,..---.. IE ..

T

CI R2 (A)

8.56- 1260 0.72 LI

2 C3 4 JI SI .5 200

3 TALK 3 P MON ....... OISC P 2 I P

R6 2

. I 2

(0) C2

8.56-8.72

KI SLEEVE A

R3A 67

C

3

R3B 67

4T 2T

I I

2 I - I -------~

5

3

: t I IV'C

:80 I I I I I

600

C4 1.07-1.09

K6 SLEEVE B

C I

K3 I 2T ! : PAD CONT : 5T 3~C :

~! 4T ~-t+O""'--------'''l: 2 -~~,~c~-------------------_4-8--V 68 6T ~

: 1300

R

S

: I I ! -24V~~-3------------------~----

I ~

_24V~5 : 210

TO ANSWERING JACK AND LAMP CICT

I SB:4l -------------------------.f~;----------------------~-=~c~ ~ 3.: 4B ~

BL

---[>C

----24V

----4BV

~~c~~------------------------- .--. -48V NOTE 2

NOTES: I. UNLESS OTHERWISE SPECIFIED

RESISTANCE VALUES ARE IN OHMS CAPACITANCE VALUES ARE IN MICROFARADS

2. PROVIDE -Z- OPTION WHEN BUSY LAMP CIRCUIT IS USED

3. FOR INFORMATION CONCERNING RELAY TERMINAL IDENTIFICATION. SEE STANDARD PRACTICE XX X

4. TERMINAL NUM~RING FOR SI IS FOR REFERENCE ONLY. RELATIVE LOCATION OF TERMINALS AND MARKINGS IS SHOWN IN DIAGRAM BELOW.

SI

DISC TALK MON

OPERATING END

FIGURE 8·17 - TYPICAL SWITCHING·CIRCUIT SCHEMATIC DIAGRAM (USE OF JUNCTION DOTS OPTIONAL)

20

~

ELECTRICAL AND ELECTRONICS DIAGRAMS

INCOMING TRK CKT

I

51 TALK MON

NL KEY

3 P

2

K2 PAD SHORT

MONITOR POSITION

'0:. ~ ,

I

k4

2T

SI TALK CI DISC 8.56 - 8.72 L KEY

28 I

51 TALIC

C2 DISC L KEY 8.56-8.72

2C I

C

~8y~~5~T~ ______ ~KI~5~ _________ ~~~:~_~ . ----UZ5OO 3 5 2T; I "C

K3 PAD CONT

AAA K6 -48Y,--~~--~)f~--E>-

L-5~~~;~i~::---C---:4::T-l)~(-=3:--"'1>c INCOMING .:;.BL':'-__ ""T"'_~KM3_--r _____ r,b TRIC CICT ,--5~B...,:~1 4~..II1 C. :iI"'.-J--r--48

Y

3 48

GRD BUS ----t>C

~T~~S -24Y

45-SOY -"8Y BAT. BUS

P

k2

28

RIA RIB 67 67

R2 1260

C3 .5

2 K5 K2 PAD IT CONT

R3A R3B 67 67

K2

3 4T

4 - 3

K6 3

A

R6 600

C4 1.07-1.09

2 KI

IT

K6

T

P

R

KI SLEEYE 8

~1---2"""'II-B~--=3;;::M~I~:~~8~5-"'''''''''';S~ 4M I

C 5-1800

K3

TO ANSWERING JACK AND LAMP CKT

KI NOTE 5

-24Y--~6~T~)*(~5--~3~1-,~t~----T~--~L.

28 L...L Tg,,:'g~i -Z4Y

NOTES: I. UNLESS OTHERWISE SPECIFIED:

RESISTANCE VALUES ARE IN OHMS CAPACITANCE VALUES ARE IN MICROFARADS.

2. PROVIDE ·Z· OPTION WHEN BUSY LAMP ctRCUIT IS USED.

3. FOR INFORMATION CONCERNING RELAY TERMINAL IDENTIFICATION. SEE STANDARD PRACTICE XXX.

4. TERMINAL NUMBERING FOR 51 IS FOR REFERENCE ONLY. RELATIYE LOCATION OF TERMINALS AND MARKINGS SHOWN IN DIAGRAM BELOW.

51

0 0 o r 2 A I 0 0 1

10 0 0

00

0 C 2 ~ B

s , TERMINAL ENO

DISC TALK MOM

OPERATIfiCG END

5. K3 RELAY, CONTACTS 1-28 MAKE BEFORE CONTACTS 1-3 BREAk.

FIGURE 8-18 - CONTACT-SEPARATION METHOD OF SCHEMATIC REPRESENTATION (CIRCUIT SAME AS SHOWN IN FIGURE 8-17)

21

(

(

A

B

C

D

E

USA STANDARD DRAFTING PRACTICES

LINK CLOSED

FOR LOOP OPERATION

GR~~r---t5

GR~~H

LI FM ANT. L

4 ~ C2B FM ANT. ~ 9-27

EI

AM LOOP

VI 6CBS

RF AMPL

RI 2.2M [2~~7

II 12pL

(;!) PART OF

SIA REAR

4

RF ENCLOSURE r--------------------------------------------------------I I I I I I CS -!:- J..,orC2C ~ L2 I : 101' "'1"7-22 ~FMOSC :

I ~( I I I I C I I R3 R4 I : 10K 33K I i -l- C5 V2""'-- ~ I 14700 SX8 II I MIXER OSC W~ T2

~: R5 C7}'r-- 9 10.7 MC I -:: \6 I 68K ;~ 2( - ___ I 8 Ai-----------lc I

::: ~!l ~4~6C ~2. I "RS \~ B: 33'+ it: 33 i ! 68 i SIC 18K L--------D --i !

~ 7C I FRONT ""-- I I E C I

1 ;~~~ 2!17¥ t;2~~1: AMTlosC ~ RS~~R 1

I V'c B V'~ 98 ~~ !

C21 7 t 1f T7 I

r d' ..v ~. 3 455 KC I I

2~17j" 1'"9C-~j ~F~3RF 1-- ----- I I

~7C J3~T l[ 3301 i

I I I L-------2 --~ :

10 SI8 I

~ __ +_-..;.9O-+J t FRONT ~~/5

+21811

R9 S80

+222V-J>{I.I\r---i

PART OF SIA

REAR

7 S '-

6

J2 TEST POINT ,

V4 6AU6

2ND IF AMPL

+222V

RIO lOOK

T3 FM 5 A 10.7MC C~~ RII .--1--------, C 2 - +S911

'OOK

I IC ::: I ::::..:..:...J61 I ~.33: I i ----'" -!- CIO I I 4roO

L...OI----- -~ --, 1 RI2 : .J... CII 120 ~4700

\7c

.T4 10.7MC

II'-----:,-h I ~~ " I, 1/ I ,: I I ,}O I

2 122 ;:, l : II I L,-------l

RI6 120

T8

RI3 rl CI2 680 14700

3 455 KC r-- ---------. I -. i

' 1250;, At ~2~

4: 125 I L------2 -----;h5

R32 R33 r' lOOK 390K "C

+22211

v

RI4 220K

CI4 r RI9 47001 33K

+222V

R20 100

R22 18K

I I ,.. I I

I/~ R21 CI5 c',~ 2200

470 470

'i7C

t:C17 + CI8 2UF 4700

5

~

R23 I 200

R 24 3 9K

'VC

II 8 I R26

: 330 II 12. I R27 C23 . .r R30

+222V -: CI9

~c4700

JI

: 3300 SIB • I R25 - 3 9M 4700~C 1200 I -AI\A_ REAR J +222V

C34 ~38 .0IUF lOOK

Hr-- R39

'330K I -"2 3 rJ SIA

: "'~4 C2Ei,f. >. 7' R28 : C 10 FRONT I 12- _ (T 6 680 I ~ V8 I 231.5 ' 2-17 I 9~. :3 R34 SAV6 +73V : 1---'1,-""=5---...J.--4 I ~J\.'L.~/tt-r;;::4~\-;+-t-t--m+r+',., 1 V~~~ME DET-AVC-AF - I I

I AM RF 120K : S1 ~ ~2b20.:r_ (NOTE 3) .~lyF _ -0.8V " ( - - 5 \JC ( -' '3~ : 1"-2i60 7~igo I fI3:-":1 2 I "C I\)h R37t- --:, 6 C : m rh: R31: cW' 5"4.... 10M 2

L-___ -!I ______________________ ....L _________ L.-__ t-I ____ --I. ____ 2_.2_M--I I 8 ~I ~~~ .8,~} C C R41

I TS Uc R29 I ~t '" '-0-- C33 AMPL .r: j' C3330?T4C7300] mo~

L _____________________________________________________ -i .5;;UFic! ~Jl' ~'-,-,\M'----it---t>c -:3 ~~o I _ 470K"7,

~~~~~ r»..,.:--t-r.---------r.-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-~-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-' ___ J ~c~0~~6UF 1 r E 1 C

S2 / T9 Y 260V,S2MILLI A \l NOTES:

V9 6V6-GT

AUDIO OUTPUT

+22211 +24311

4

5'¢8 t12.6V ioe--

C40A -!- : R42 20UF'L 330

'VC

...

TIO LSI

~ SR BK

C

SL

--L

R43 1500

III + 22211 _ C40B L4 ON-OFF,' It

WI II TURN (NOTE 3)1 Uf-...:.Y ______ --,

BIFILAR I..J. 2 oJ-PI -'-1 I C27.l.. ~ R V7 4

I. UNLESS OTHERWISE SPECIFIED RESISTANCE VALUES ARE IN OHMS, CAPACITANCE VALUES ARE IN PICOFARADS.

4. TERMINAL NUMBERING FOR SWITCH SI IS FOR REFERENCE ONLY. RELATIVE LOCATION Of TERMINALS IS SHOWN IN DIAGRAM AT RIGHT OF TABLE SWITCH IS SHOWN IIIEWED FROM FRONT WITH KNOB IN EXTREME CCW POSITION.

C40C ...,

30UF ~C ~c50UF

~~~sC~ ,,:A:. :::b ~ S~C;T : LJ l'--__ 4_7_0-Llr __ ~BK~ R 6

~~2 DIAL LAMPS

C29J .0IUF.l

C30 ;:J;.OIUF

...!-C31 ;J;.OIUF

L7

L8 L9

- C32 ;:J;.OIUF

2. VOLTAGES MEASURED TO COMMON WIRING WITH VTIIM.

3. SWITCH S2 IS PART OF POTENTIOMETER R34. TERMINAL NUMBERING IS FOR REFERENCE ONLY. RELATIVE LOCATION OF TERMINALS IS SHOWN ®,2 IN DIAGRAM AT RIGHT. R:34 0 0

TERMINAL I 2 SIDE 5 4

:3 2 I

SWITCH SECTIONS AND TERMINALS CONNECTED

POS FUNCT I ON 1--:=-=-="",ST'A",=-:-::--+=::-:==jSI=8--=-:::-:-:::-+::=~Srl C'-::::::-:-;:---i FRONT REAR FRONT REAR FRONT REAR

I PHONO 3-4 5-S-7 - - - 8-9 (SHOWN)

2 AM 3-5, &i9 4-S-7, 8-9 6-7,11-12 11-12 7-8,9-10

RADIO 11-12

3 FM 3-S, 9~ 10 4-5-7, 9-10 6-7,12-1 12-1 8-9 RADIO 12-1

SO-8021S1

HIGHEST REFERENCE

DESIGNATIONS C421 L9 R43

REFERENCE DESIGNATIONS N~T USED'---i

FIGURE 8·19 - TYPICAL SCHEMATIC DIAGRAM (SEE 15-8.11 FOR OTHER FORM)

22

(

(

LINK CLOSED

FOR LOOP OPERATION

GRD

GRD

FM ANT.

TBI CI :3

4

JI

EI AM LOOP

C20 150

ELECTRICAL AND ELECTRONICS DIAGRAMS

T 2-17

tl55V

RF ENCLOSURE ,----------------'-------------1

t200V

C21 33

L3 FM RF

+200V

R5 6SK

T 2-17

+200V

R27 3.9M

R29 120K

+140V T7

455 KC R30 4'-----------l2 1200

31330

L _____ _

T2 10.7MC

I

o B'------A: 33

L. _________ ;;,

L2 C2C FM

OSC 7-22

T 2-17

I C24 I

C4 C25 14700 I L 1 4700 4700 l' I ------------------------------~

SIA FRONT

+165V

TS 455 KC I

--I 1

250: 2

8 9

~:

C26 R:31 .047 ~ 2.2M

UF C

SIA REAR

( J

+222V

+165V

tl30V

R9 680

RS 22K

C9 1'4700

VSA SAV6

DET-AYC

+205V T4 10.7MC

2'---------,

FM

500K

250K

I I 1 I 13

R36 10K

C36 '* .039 ~C UF

+205Y RI3 1

680 I 1 1

CI2 RII I

t69V l'47oo I

lOOK: I

CIO : 1'4700:

PHONO~,--+-----------------------------------------------------------------------~ I I I

INPUTM

WI

r----- - - -- --------- - - ---- -- ---- --- --- ---- - ------- ----- ---- -_ - ____________ - ----------------------- ---- ____ J

: T9 R I R-Y I I

2 R W

BK

FIGURE 8·20 - TYPICAL SCHEMATIC DIAGRAM

23

V3

4 3 4 3

VI V2

L9

NOTES: I. UNLESS OTHERWISE SPECIFIED

RESISTANCE VALUES ARE IN OHMS, CAPACITANCE VALUES ARE IN PICOFARADS.

R34 2. VOLTAGES MEASURED TO COMMON T£::RMINAL

WIRING WITH VTVM. SIDE

3. SWITCH S2 IS PART OF POTENTIOMETER R34. 02

;;~~~I~~t~~:~~~T\~:O;F ~E::::I;~i~ F °2 IS SHOWN IN DIAGRAM AT RIGHT, 5 3 2 I 4

J2 TEST POINT

+168V

+IOOV

+53V CI4 1: 4700

CI3

1 4700

VSB 6AV6

AF AMPL

C3S 4700

C37

7 330 C

V6

i 6AL5 RATIO DET

:+222V

+222V

R22 18K

R23 1200

CI6 470 CI5 470

R21 2200

, CI9

~C4700

V9 6V6-GT

AUDIO OUTPUT

1~6~ PT OF TlO

R38 lOOK

RI9 33K

RI7 1

630

RIS 33K

BR R + C40C~ 30UF

C

4. TERMINAL NUMBERING FOR SWITCH SI Ib FOR REFERENCE ONLY. RELATIVE LOCATION OF TERMINALS IS SHOWN IN DIAGRAM AT RIGHT OF TABLE. SWITCH IS SHOWN VIEWED FROM FRONT WITH KNOB IN EXTREME CCW POSITION,

SWITCH SECTIONS AND l1ERMINALS CONNECTED P~S FUNCTION SIA SI8 SIC

FRONT REAR FRONT REAR FRONT REAR

2 8-9 6-7,11-12 II -12

3 9-10 6-7,12-1 12-1

R24 39K

SI

CIS 4700

HIGHEST REFERENCE

DESIGNATIONS

C42 L9 R43

(

(

LINK CLOSED

FOR LOOP OPERATION

GRD

GRD

FM ANT.

TBI CI 3

4

USA STANDARD DRAFTING PRACTICES

RF ENCLOSURE 1-----------------------------,

EI AM LOOP

t200V

C21 33 FM _

L3 C2F T FM RF 9-27 2-17

Ave

SIC REAR

R27 3.9M

AVC

tl40V T7

455 KC 4 r-----------'2

L _________ ;;,

R30 1200

AM/FM

AVC

t

AVC

T 2-17

I I I I I I I I I I I

+165V

T8 455 KC I

AVC

SIA FRONT

8 9

--I I

250 i 2

AM AUDIO +

C26 R31 .047 ~ 2.2M

UF C

SIA REAR

« I

+205V

V8A 6AV6

DET-AVC

T4 10.n.1C

2 r-- -- ----'-,'

RIO 10K

FM AUDIO

AM AUDIO

PHONO AUDIO-

R36 10K

500K

I I I

33 I 13

SIA FRONT

J2 TEST POINT

RI4 220K

FM

tl6SV

fl00V i

R39, 330K'

+73V

VSS 6AV6

V6 R23 6AL5 1200

RATIO DET

+222V

CI6 470 R24 CIS 39K + 470 CI7

R21 2200

+ FM AUDIO

R22 18K

CI9

~C4700

AUDIO _

V9 6VS-GT

2UF

AF AMPL ..... -~j.-,..,.O\-AUDIO

OUTPUT

C38 4700

CIS 4700

C

t L2

C2C FM ~--~~~-----~

C36 ~ :CW ;h

JI

C20 150

tl55V

+200V

R5 68K

AVC

t200V

R29 120K

OSC 7-22

I C24 I

C4 C25 14700 II

1'4700 4700 l' L ______________________________ ~

PHONO AUDIO _

t222V

tl65V

tl30V

R9 680

R8 22K

C9 1'4700

.039 ~C I UF !

I I I I I I

t205V RI3 680

RII I

lOOK: ~------~ I

CIO : 1'4700:

PHONO~,---r--------------------------------------------------------------------------------------------------------------------------~ I I I

INPUTM

115V 60 CIS

WI

,----- - - ---------- -- ----- --- ____________________________________________________________________________ ...J

I " . I R I R-Y I I

2 W

8K

R

Y Y L9

NOTES: I. UNLESS OTHERWISE SPECIFIED

RESISTANCE VALUES ARE IN OHMS, CAPACITANCE VALUES ARE IN PICOFARADS.

2. VOLTAGES MEASURED TO COMMON WIRING WITH VTVM.

R34 TERMINAL

SIDE

C

DIAL LAMPS

3. SWITCH S2 IS PART OF POTENTIOMETER R34.@2 TERMINAL NUMBERING IS FOR REFERENCE 1° °2 ONLY. RELATIVE LOCATION OF TERMINALS 4 IS SHOWN IN DIAGRAM AT RIGHT. 5:3 2 I

FIGURE 8·21 - TYPICAL MAINTENANCE TYPE-SCHEMATIC DIAGRAM

24

C37 ~ 330 C

t222V

I~g PTOF TlO

tipOV R38 lOOK

BR R t ... ,

'I----'W'v----l RI9 33K

C40C~ 30UF 400V

C

t53V

CI3

1 4700

RI7 630

RIS 33K

4. TERMINAL NUMBkRING FOR SWITCH SI IS FOR REFERENCE ONLY. RELATIVE LOCATION OF TERMINALS IS SHOWN IN DIAGRAM AT RIGHT OF TABLE: SWITCH IS SHOWN VIEWED FROM FRONT WITH KNOB IN E;XTREME CCW POSITION.

SWITCH SECTIONS AND TERMINALS CONNECTED POS FUNCTION SIA SIB SIC

f1P.ONT REAR FRONT REAR FRONT REAR

(~~g~~) 3-4 5-6-7

2 AM RADIO 3-5,8-94-6-7,11-1 8-9 6-7,IH2" - 12

:3 FM RADIO 3-6,9'1045'7,12'1 9-10 6-7,12-1 12-1 8-9

SI

HIGHEST REFERENCE

DESIGNATIONS

C42 L9 R43

)

~ VI

'.,

UfCIT 2

TRAM'MITTER-RECEIVER

Til, T T TTl 1 T T T T

lIMIT I

POWIR INPUTS

C

.1...,.I0Il lOX --I Til, T T TTl

... IARTH

OItOUllD

I I

SIG (. INPUTS·

+IIV

~

AI

CONTROL PANEL REF DESIO PREFIX 3AI

'10

PI 1.11 II

Aiif'\. CDflTRCK..

+24V

AI INDICATOR auau ..... y, REF DESIO JOtIUIX SAl

-DII

C

- "I ... "t!..l.(

ARI

AMl't.IFI£R +11\' REF DESIO PREFIX~ MIARI C2

-I 01 f-3~1

~l RI

~' I I C I C I I I

R

Itt

--~+-

l

I I I

I I I

~ I

4 HJ Ie t· m-, - ~ +IIV

+12V RIGULATED

IATTIRY SUPPLY

~ 110 INPUTS

Ims. I. PAUlA&. R[FElIDlCE DESlCIlATlOIIS AlE 1lI0II.

'01 CCIIPLm DESIUATlOII'flREFII WITN IlIIT NWIEIt UD SUIASSEMa. Y DESICIATlO.S.

2. ~=~M~~f~l0:R~I:r:~~~. SYIIIOL

~R +2'" SU'PL Y R£lUI.

-(>C SIIWl CIOUID

-t>, FWIt CItGUIID

FIGURE 8.22 - TYPICAL APPLICATION OF CIRCUIT RETURN SYMBOLS

tTl t""' tTl q ~ ()

F: § tTl t""' tTl () ..;

~ z n (J)

o >= c;') ::a ~ (J)

USA STANDARD DRAFTING PRACTICES

15-8.12 Single-Line Diagrams lor Microwave Circuits

Single-line symbols shall be used in represent­ing coaxial and waveguide parts on microwave­circuit Schematic Diagrams. For the auxiliary portions of the circuit such as power supply or controls, single-line or complete symbols may be used. For sample diagram, see Figure 8-24.

15-8.12.1 Transmission Path Recognition Symbol

Type of transmission path, such as coaxial or waveguide, need be indicated only at each end of a path as long as the path remains of the same type. See waveguide path from CPI to MT2 via A4, AS and A6 on Figure 8-24. Additional recog­nition symbols may be shown as required for further clarification.

15-8.12.2 Connector and Flange Symbols Transmission path separable connectors or

equipment flanges shall be identified only when it is necessary to indicate the elecuical func­tion or separable feature of these parts. See representation of M2 and WI in Figure 8-24.

E5 0-0-

EI ~ RI

15-8.12.3 DC Continuity and Discontinuity When the circuit includes DC and RF sig­

nals, DC continuity should be clearly shown. See A3 and A5 of Figure 8-24. MT2 illustrates method of indicating DC discontinuity. The discontinuity symbol is used to indicate absence of direct electrical connection between a waveguide and the outer conductor of a coaxial cable at a point where the tr:ansmission paths change from wave­guide to coaxial or vice versa.

15-8.12.4 Pressure Seals When it is necessary to indicate that certain

path sections of waveguide are sealed from other paths of the circuit, a note similar to note I of Figure 8-24 shall be used. This particular note indicates that the path from EI via AIHYI, CPI, A2S2, DCl, and ZI is a sealed path.

15-8.12.5 Subassemblies Subassemblies such as mixers may be shown

with all parts represented as shown in A7 of Figure 8-24, or, if such ietailed representation is not essential, a general overall symbol may be used as shown for A 7.

R3 240 Ea

E4

00-E2 Q~

E4 ~:1~3~~ ____ ~ ____ -L ______ ~ ______ ~E~5~

TERMINALS USED

PRINTED CIRCUIT USED AS PLUG-IN ELEMENT

~PI

REPLACEABLE PLUG

PHYSICAL ARRANGEMENT OF clRCurr TERMINATIONS

CRI 2 1N696 2

2~-__ ""'-'

(A)

(8)

R3 240 3

4

5

R3 PART 240 OF PI

r--JV'tJ"--r~3

"-:-::~""""----~4

~--~---L------~----~--------~~5 (C)

SCHEMATIC REPRESENTATIONS

3

~ 2 5

GRAPHIC sneoL USED ON OVERALL SCl£MATIC

FIGURE 8-23 - SCHEMATIC REPRESENTATION IN RELATION TO TERMINATION METHOD USED

26

')

t-..)

-..J

EI

r-----, IANTENNA I I DRIVE r----L. ____ .I

-")

NOTE I

E2

---~""---1""J. BU" I 1111 I I I

I A2

:FO~:I : I ~S1

: 521 08 I

A

I I

L __

r---~--l

~I~~f I

I

EI

A7

... , ...

NOTES: I. THIS CONNECTION SEAlS)

TO MAINTAIN A PRESSURE DIFFERENCE OF 15 PSIG

2. REMOVE "X· OPTION AND PROVIDE ·Y"OPTION FOR TEST PURPOSES ONLY

3. PARTIAL REFERENCE DESlGNA-

lc:t:~S:fo.FOR PREFIX WITH tNT tUIBER AM) SlI8ASsaa Y DESIGNA­TIONS.

NOTE 2

~)M2 LI

~AJSHUTTER CONTROL 8 A

ARI

MIXER

TO CIRCUIT

It.

TO CIRCUIT

B

~t~ l I ~ 2~~~ 't~ ~ X30C8 B ~ F.'~ENCY L __ £________ ________ _ _______________ ~ .. ~ FIGURE 8-24 - TYPICAL MICROWAVE-CIRCUIT SCHEMATIC DIAGRAM

l

tr1 t"4 tr1 () t-i :;d

n :> t"4 :> Z o tr1 t"4 tr1 () t-i :;d o z n en o -:> G') :;d

~ en

USA STANDARD DRAFTING PRACTICES

15-9 Schematic Diagrams (Power Switchgear and Industrial Control)

The following subparagraphs contain detailed information specifically applicable to Power Switchgear and Industrial Control Schematic Dia­grams. This material is to be used as a supple­ment to the general standards of 15-7.

15-9.1 Contents A Schematic Diagram shows in the simplest

manner the circuits and functions of the com­ponent devices or parts of the electrical equip­ment. Consideration shall be given to inclusion of the following information.

15-9.1.1 Device Ratings (Fuses, Resistors, etc.) Note: Industrial Control Schematic Diagrams may omit device ratings when they are used as standard drawings applying to more than one rating.

15-9.1.1.1 Rating Location Device ratings should be located close to

the device symbol to assure correct identifica­tion. For example, see ratings of 40 amperes for the fuse, Figure 9-1(A); 3300 ohms for the re­sistor, Figure 9-1(B); 200/5 (amperes) for the current transformer, Figure 9-1(C); and the volt­age ratio for the 115000-115 volt potential trans­formers, Figure 9-1(0). Polarity marks shall be shown on all instrument transformers.

(A)

40AMP

(8)

3300 OHM

II' LtG 115000-115

rrr lit

(0)

(C)

FIGURE 9·1 - TYPICAL LOCATIONS FOR DEVICE RATINGS

28

15-9.1.1.2 Current Trans formers Where current transformers are the multi­

ratio type, both the maximum current ratio and the ratio of the tap to which the external circuit is connected should be shown as indicated in Figure 9-2.

FIGURE 9·2 - TYPICAL MUL TI·RATIO CURRENT TRANSFORMER RATING

15-9.1.2 Explanatory Notes Where die function is not clear, explanatory

notes should be added for clarification. For ex­ample, the note adjacent to device 23 in Figure 9-3 indicates that the contact cIo ses at 40 F on decreasing temperature. Where notes are lengthy or need repeating they may be shown at a com­mon location with proper reference at the point of application.

23

CLOSES AT 40 F DECREASING

HTR 200W

FIGURE 9·3 - TYPICAL DEVICE FUNCTION EXPLANATORY NOTE

ELECTRICAL AND ELECTRONICS DIAGRAMS

15-9.1.3 Wire and Terminal Designations Wire or terminal (or both) designations iden­

tify the conductors and terminals and facilitate checking of circuits. The use of wire or terminal (or both) designations should be determined by the overall adaptability to the design, assembly, installation, and maintenance of equipment. Simple designations are desirable as illustrated in Figure 9-4.

8

101"-WIRE NUMBERS

103

(A)

52Y 52X 101 102 A . 103 ~---~~l-2--~--~7V-B----

'-TERMINAL

(B)

NUMBERS

FIGURE 9-4 - TYPICAL TERMINAL AND WIRE DESIGNATIONS

15-9.1.3.1 Designation Location Whenever possible, all wire design~tions

should be located either above or to the nght of its line and terminal designations either below or to th; left of its symbol as indicated in Figure 9-4. However, any other consistent system of wire and terminal designation 10 cation may be used.

15-9.1.4 Wire Designations Wire designations are usually arbitrary iden­

tifications assigned to specific conductors. These may comprise a series of numbers, char­acters or symbols, or combinations of each, or both. The following are a few examples:

1, 2, 3, etc. A, B, C, etc. +, -, ±, etc.

1-1, 1-2, 1-3, etc. A-A, A-B, A-C, etc. A+, A-, lA+, etc. I-AI, 2-Al, 3-Al, etc.

29

15-9.1.4.1 Designations Denoting a Func­tion

Designation numbers, characters and symbols also denoting a function may be chosen. The following are a few examples:

Designation Function 1 Phase 1 2 Phase 2 3 Phase 3

A Phase A B Phase B C Phase C

P Positive N Negative C Close T Trip R Red Lamp G Green Lamp A Alarm AP Alarm Positive A+ Alarm Positive

1-1 Unit 1, Phase 1 1-2 Unit 1, Phase 2 1"'3 Unit 1, Phase 3

A-A Unit A, Phase A A-B Unit A, Phase B A-C Unit A, Phase C

LI Line 1 L2 Line 2 L3 Line 3

+ Positive Negative

± Neutral

15-9.1.4.2 Designations Denoting Location Designations may also be used to denote

location as well as function. Figure 9-5 illus­trates standard identification of bushing type current transformers and leads. See NEMA SG4 Part 3. Designation IYl, for example, denotes that the connection originates on circuit breaker pole 1 as indicated by the first digit, the letter Y denotes the upper transformer (further removed from the breaker contacts) and the last digit 1, the secondary winding tap number.

15-9.1.4.3 Assigned (Wire) Designations The assigned wire designation for a con­

tinuous electrical connection should be retained whenever practicable until the circuit charac­teristic is altered. Figure 9-11 illustrate s good drafting practice in this respect. In many in­s.tances it is not practicable to retain the same wire designation throughout because of estab­lished terminal marking standards, differences in

USA STANDARD DRAFTING PRACTICES

design, drafting and manufacturing practices. However, the same designation shall be used be­tween any two interconnected points. Figure 9-10, "52 Closing Circuit" and cc52 Tripping Circuit," illustrates good drafting practice in this' respect.

15-9.1.5 Terminal Designations Standard terminal designations have been

applied to electric power apparatus such as motors, generators, transformers, etc., and are covered in USA Standard Terminal Markings for Electrical Apparatus C6.1 and for power cir­cuit breakers in USA Standard Power Circuit Breaker Control C37.11. Where no standard term­inal designation exists, amitrarily chosen desig­nations may be used similar to the method de­scribed in 15-9.1.4.

6 4

5 3

FIGURE 9-5 - STANDARD IDENTIFICATION OF BUSHING CURRENT TRANSFORMERS

15-9.J...5.1 Interconnecting Unrelated Term­inal Designations

Figure 9-6 illustrates good drafting prac­tice when interconnecting electrical equipments which have unrelated terminal designations. This figure shows in schematic form a typical indus­trial control circuit. The location of the various

30

devices has been shown for illustra.tive pur­poses only. The terminals for each of the panels where these devices are located shall be shown in their proper po sition in the circuit. The inter­connecting wires required between the panel terminals can thus be seen. Reference may be made to the associated interconnection diagrams. However, any other consistent system of device, terminal and interconnecting designations may be used.

1-----1I5V AC CONTROL SOURCE---....

(

DEVICE FUNCTION DESIGNATION

(

EQUIPMENT LOCATION (NTERCONNECTION WIRE DESIGNATION

X TR-A WI CR·S W2 W3 Y o-~I~~--o-~~-o--o---iM-C~-<~

I 2 S 9 2 7

TERMINAL L.;;W;.;;;2;"'O_-{IM-A ..... ----. DESIGNATION 4

IM-A 1-..---~~----~2M~~---~

DEVICE LOCATIONS: IM-A ON PANEL A 2M-A ON PANEL A TR-A ON PANELA CR-S ON PANELS M-C ON PANELC

~ .l TERMINAL POINT Y (EXTERNAL CONNECTION)

FIGURE 9-6 - TYPICAL SCHEMATIC DIAGRAM SHOWING TERMINAL AND INTERCONNECTION

DESIGNATIONS

15-9.1.6 Mechanism End of Power Circuit Breaker

The location of the breaker mechanism M de­termines the designation numbers of the breaker bushings and their associated current trans­formers. Refer to NEMA SG4, Part 3. The breaker mechanism location with respect to the phase identification is required for the proper connec­tions of the current transformers. See Figures 9-7(A) and 9-7(B).

15-9.2 General Layout The arrangement of the diagram should show

all circuits in the clearest manner. The follow­ing requirements shall be observed in the prepara­tion of the diagram.

ELECTRICAL AND ELECTRONICS DIAGRAMS

PHI

2 3

52

5 3

LOAD (Al

M

2 3

LOAD (8)

FIGUR E 9-7 - PROPE R LOCATION OF MECHAN ISM WITH RESPECT TO BREAKER BUSHINGS

15-9.2.1 Graphic Symbols Symbols for Schematic Diagrams are intended

to indicate the • operating functions. These sym­bols are shorthand graphical representation and are not necessarily intended to represent the physical likeness of the device nor contain com­plete electrical connections. Graphic symbols shall be applied as described in 15-3.6.

15-9.2.2 Abbreviations Abbreviations shall be applied as described

in 15-3.7.

15-9.2.3 Device Function Designations

15-9.2.3.1 Device Function Designations for Power Switchgear

Device function designations as applied to Power Switchgear shall conform wi th USA Standard Manual and Automatic Station Control, Supervisory, and Associated Telemetering Equip­ments, C37.2 or other national-level standards if the device function designation is not covered in the USA Standard. Those device letters which denote parts of the main device, and those which cannot or need not form part of the device function designation, are generally written direct­ly below the device function "designation, as for

example, 52 or CS. If two or more devices with LC T

the same function designation and suffix letter (if used) are present in the same equipment, they may be distinguished by numbered suffixes, as for example, 51-1, 51-2, and 51-3, when neces­sary.

15-9.2.3.2 Device Function Designations for Industrial Control

Device function designations as applied to Industrial Control shall conform with NEMA

31

Standard ICI, Part 3 until a USA Standard is issued.

15-9.2.4 Device Contacts When necessary to understand the function of

a circuit, the sequence of operation of contacts within a conuol or protective device should be shown on the Schematic Diagram, or reference made to the appropriate drawings. Consideration should also be given to cross-referencing con­tacts of relays or other devices which are used in circuits remote from the operating coil. .In ad­dition, the unused contacts of the devices may also be shown.

15-9.2.5 Circuit Arrangements The circuits should be arranged in functional

sequence, left to right or top to bottom. How­ever, this should not be followed rigidly where excessi ve line crossings would impair the clarity of the diagram. In Figure 9-8, the pressure switch PS when closed energizes device TR, whose time closing contact then energizes device lCR, which in turn energizes device M.

y

...... --------1I5V AC -------~~...41

PS .... ----f ~--------..( TR )-----..

TR .... ----f 1---------..... ICR ~--..

TC

leR M

FIGURE 9-8 - EXAMPLE OF CIRCUIT ARRANGEMENT IN FUNCTIONAL

SEQUENCE

15-9.2.6 Control Sources Control sources should be shown by means

of horizontal or vertical parallel lines with de­tailed circuits between and perpendicular to them. Note AC source X and Y shown in Figure 9-8.

15-9.2.7 Physical Relationship Physical relationship between portions of a

device ~re usually disregarded. In Figure 9-8, the coil and contacts of device lCR are shown separated to facilitate tracing the circuit and its function.

USA STANDARD DRAFTING PRACTICES

15-9.2.8 Course of Circuit Course of each circuit should be shown in

the most direct path. Refer also to 15-7.1.

15-9.2.9 Horizontal and Vertical Lines Lines between symbols should be horizontal

or vertical with a minimum of line crossings, and with spacing to avoid crowding. Refer to 15-7.2.

15-9.2.10 Phasing Indication Phasing of alternating current components

should be indicated so that there is general agreement with the actual physical arrangement and suitable notes applied where necessary. When physical arrangement is not the governing factor, the phasing should be indicated in se­quence, 1, 2, 3, N from left to right or top to bottom.

15-9.2.11 Polarity Indication Polarity of direct current components should

be indicated with a up" or U+" for positive, uN" or (-) for negative, and CCPN" or ± for neu­tral. Direct current busses should be shown in sequence, positive, neutral, negative from left to right or top to bottom when physical arrangement is not the governing faccor.

32

15-9.3 Typical Schematic Diagrams Typical Schematic Diagrams that illusuate

good drafting practices are shown in Figures 9-9, 9-10 and 9-11.

15-10 Connection Diagrams Material for this paragraph has not yet been

approved as USA Standard. Material approved by the Sectional Committee has been published as a Proposed '(}'SA Standard for uial use (see page 39). Industry comments are welcomed and will be considered before final adoption of this section as a USA Standard.

15-11 Interconnection Diagrams Material for this paragraph has not yet been

approved for circulation as a Proposed Standard.

15-12 Terminal Diagrams Material for this paragraph has not yet been

approved as USA Standard. Material approved by the Sectional Committee has been published as a Proposed USA Standard for trial use (see page 66). Industry comments are welcomed and will be considered before final adoption of this section as a USA Standard.

ELECTRICAL AND ELECTRONICS DIAGRAMS

115KV BUS

II ~ : ==::=:==:==================================================H-II"'~:H=2=H:I~:H=2=H=I .. t;1-H=2====II'

NC } 115000-115

67G NEUT CT ~ PWRTRANS

8 7 NCO SEE DWG-

ICII ICO

5 6

6 X 5, 4 X 5, 2 X 5

2CI 5X5

WM

BUS DIFF SEE DWG-

66400-115

~I'

:=LX2~}SYN ..... -+---. :=r'1' ~ SEE DWG-

LINE I

AM

2CO 2 6 2 4 8

2 4 VARM

6 8

51 AC TIME OVERCURRENT RELAY

52 AC CIRCUIT BREAKER

67G AC DIRECTIONAL OVERCURRENT GROUND RELAY

AS AMMETER SWITCH

VS VOLTMETER SWITCH

M BREAKER MECHANISM

DRAWING REFERENCES

DC SCHEMATIC DIAGRAM ... FIG 9-10 DEVICE INTERNAL CONNECTION

DIAGRA ..... FIG 10-14

FIGURE 9·9 - TYPICAL POWER SWITCHGEAR AC SCHEMATIC DIAGRAM (USING BOTH TERMINAL AND WIRE DESIGNATIONS)

33

VM

+

USA STANDARD DRAFTING PRACTICES

152 CLOSING CIRCUIT

8-1 TP

52 TRIPPING CIOCUIT---1

II

I CS 40

ICI'

AMP

CPI CP

I SS NOTE I IC

3 CS

3TT I 1 51-1 51-2 51-3 67G 87X

2C CS 2 2 2 2 2 RL

2 T 7 5 G

T

5 13 9

52 5

52X 2 52X 7 6

~52X 3 52 125V LC 4

DC

6 2 52

X 13 9 8-2

5 15AMP 52 :r 52

51 53 55 57

I 52 23 AT 40F 52Y 52Y ao 5 I tIll {WSES

I DECREASING

52X 52Y 2 4 2 I

6

6

6

8-1

2

8 CONTROL POWER DISCONNECTING SWITCH

23 TEMPERATURE CONTROL DEVICE

NOTE I

51 AC TIME OVERCURRENT RELAY

52 AC CIRCUIT BREAKER

00 AUXILIARY SWITCH OPEN WHEN THE OPERATING MECHANISM IS IN THE NON-OPERATED POSITION

CC CLOSING COIL LC LATCH CHECK SWITCH

TC TRIP COIL

52X CLOSING RELAY 52Y ANTI-PUMP RELAY

676 AC DIRECTIONAL OVERCURRENT GROUND RELAY

12

115V 14 52545658 AC

EXTRA AUXSW HTR

I 52 200W

2 TC

10 15AMP

V

14 10

87X DIFFERENTIAL PROTECTIVE AUXILIARY RELAY

CS CONTROL SWITCH

C CLOSE

T TRIP

HTR HEATER

55 SYNCHRONIZING SWITCH ~ AC CIRCUIT 8REAKER TERMINAL

BLOCK STUDS FOR EXTERNAL CONNECTIONS

GL GREEN LIGHT

RL RED LIGHT

NOTE I JUMPERS INSTALLED BY MANUFACTURER

DRAWING REFERENCES

AC SCHEMATIC DIAGRAM .. FIG 9-9 DEVICE INTERNAL CONNECTION

DIAGRAM .. FIG 10-14

FIGURE 9.10 - TYPICAL POWER SWITCHGEAR DC SCHEMATIC DIAGRAM (USING BOTH TERMINAL AND WIRE DESIGNATIONS)

34

~

LI

AC POWER L2

L3

M MAIN CONTACTOR

A ACCELERATING CONTACTOR

TR TIMING RELAY

ICR AUXILIARY CONTROL RELAY

2CR AUXILIARY CONTROL RELAY

OL OVERLOAD RELAY

TC TIME CLOSING CONTACT

ELECTRICAL AND ELECTRONICS DIAGRAMS

OL

LII

Ll2

Ll3

STOP START -L 3

10

ICR

2CR

FIGURE 9-11 - TYPICAL INDUSTRIAL CONTROL SCHEMATIC DIAGRAM

35

5

PROPOSED

USA STANDARD

DRAFTING PRACTICES

ELECTRICAL AND

ELECTRONICS DIAGRAMS

USAS Y14.15· 1966 15-10 CONNECTION DIAGRAMS

15-12 TERMINAL DIAGRAMS

ELECTRICAL AND ELECTRONICS DIAGRAMS

15-10 Connection Diagrams The following subparagraphs contain informa­

tion generally applicable to the preparation of all types of Connection Diagrams.

15-10.1 purpose (a) Furnish information showing electrical

connections between component devices or parts. (b) Facilitate determination of electrical con­

nection adequacy. (c) Facilitate maintenance of equipment. (d) Supplement Schematic Diagrams by relating

circuit information with the actual wiring and location of component devices or parts.

15-10.2 Types Connection Diagrams covered in this standard

fall into three classifications. These are the continuous-line type, the interrupted-line type and the tabular type. These classifications are based on the method of indicating connections between component devices or parts and whether the approach for conveying this information is or is not essentially diagrammatic. The various methods permit a selection which will satisfy the requirements of a wide range of equipment design.

15-10.2.1 Continuous-Line Type In this type of diagram, continuous lines,

generally representative of the actual between­terminal conductors or cable paths, are shown from symbol to symbol. Two somewhat similar methods whereby continuous-line diagrams may be prepared will be referred to as: (a) Point-to-Point (15-10.4.1) (b) Highway or Cable (15-10.4.2)

15-10.2.2 Interrupted-Line Type Instead of continuous lines as used in the

preceding method, connecting lines in this type of diagram start at a symbol and are interrupted a short distance away. Two rather similar me­thods whereby interrupted-line type of diagrams may be prepared will be referred to as: (a) Base-line (15-10.5.1) (b) Feed-line (15-10.5.1)

15-10.2.3 Tabular Type In the tabular arrangement of information,

15-10.6, connections between component de­vices or parts are listed in a FROM-TO type of tabulation which includes all the information necessary to identify the connections. A symbolic or pictorial representation showing the relative location of the component devices or parts, with or without connecting lines, should be referenced on or accompany the tabulation.

15-10.3 Common Requirements While there are differences in the methods of

preparation, and types of diagrams mentioned in the preceding paragraphs, there are certain re-

39

quirements which are common to all of them. The paragraphs that immediately follow cover these common requirements, and while they will apply to a greater extent to continuous- and interrupted­line diagrams, the same requirements are ap­plicable to tabular-type diagrams. The common requirements paragraphs are followed by para­graphs on specific requirements applicable to the different types of diagrams covered in this stan­dard.

15-10.3.1 Equipment Views The view or views of an equipment that are

required for a Connection Diagram are those which will most clearly show the terminals or wiring sides of the component devices or parts as they are mounted in the equipment. In most instances, one view as seen from the wiring side of the items should be sufficient. This view will generally correspond to the view of the items as seen during wiring. More than one view is usually required when the equipment is wired from both front and rear. Component devices or parts with more than one level of terminals may also require more than one view. Typical ex­amples of the type of equipment arrangement for which more than one wiring view is needed are shown in Figures 10-I(B) and 10-2(B). The Con­nection Diagram representations of these views are shown in Figures 10-I(C) and 10-2(C).

15-10.3.2 Princ'ipal and Auxiliary Wiring View Selection

When practicable, the side of the equipment or mounting surface that shows a majority of the wired items from the wiring side should be se­lected as the view for establishing a plane of reference for the Connection Diagram. This plane thus becomes the principal plane of reference. For example, when wired items mount in planes perpendicular to or at an angle to the selected principal plane, these auxiliary planes shall be rotated or revolved into the principal plane or planes of the diagram.

Planes that are merely revolved in position should be shown adjoining the principal plane or view. See rotation of sides of equipment shown in Figures 10-I(C) and 10-2(C). Planes such as those identified in Figure 10-I(C) as auxiliary planes should be oriented exactly as these equip­ment planes would appear when viewed from a normal wiring position.

Auxiliary planes may be positioned at the same location where they have been revolved or they may be shown slightly apart from the princi­pal view with an appropriate identification; see Figure 10-I(C). Views represented as auxiliary planes shall be enclosed with phantom lines in order to define the boundary limits of these planes.

PROPOSED USA STANDARD DRAFTING PRACTICES

~~~ ~

aCID e

o • ... ---------~ I. 0 I L _________ ..I

CA) VIEW AS MIGHT BE SHOWN ON EQUIPMENT DRAWING

TOP VIEWING DIRECTION

VIEWING DIRECTION & WIRING SIDE OF FRONt PANEL (UPPER PART) MOUNTED PARTS

CHASSIS SIDE

VIEWING DIRECTION & WIRING SIDE OF CHAS-SIS MOUNTED PARTS CHASSIS

FRONT

- FRONT PANEL

(B) DIRECTIONS FROM WHICH EQUIPMENT MUST BE VIEWED FOR WIRING AND PREPARATION OF CONNECTION DIAGRAM

.r--------------~ I "" XOSI : I® f.':\ 0 I

AUXILIARY _~ '-Il!J til tl2 : PlANE L _______ ~_~

REAR VIEW OF FRONr PANELfUPPER PARr)

_ _ __ _ _ __ _ _ _LINE CORRESPOND ING :HASS I S rqONT r ~ TO COU\40N EDGE OF 1¥'R ING SIDE - ............... ! r?i1 InJ CHASSIS

~ !HISI SIIbI' r--t-- ----~-'@' 1. I' HOLE-\ Jo 0 "'01 XVI

II ~o~ ';o:o~ .. ./HOLE r,::: --- ---,

tl3 f (. r' ,I []' I I I r[;l?).XV2 II ~I .:. ~ .); I I 'i:JY _ ... --.J

rap -ViEW OF TI CHASSIS SIDE~ I@ 1;;;1. , AUXILIARY PUNE

I I 0$0" PlANE CONTA I N I HG WIRING SIDE I 160 0 o<)o~

XV3 LARGEST NU"'BER L_ -12 ---- -- OF' WIRED ITEMS­

BOTTOM VIEW OF CHASSIS PRINCIPAL PlANE

(C) CONNECTION DIAGRAM VIEWS OF EQUIPMEM'T

FIGURE 10-1 - VIEWING DIRECTIONS - TYPICAL FOR CHASSIS-TY~E EQUIPMENT

40

~. ---, '~1

PANEL A

PANEL B

r

BEla ElEl8

ELECTRICAL AND ELECTRONICS DIAGRAMS

FRONT VIEW OF PANEL. A

AS AS AS a a D

~ ITS T8: ~ lUI [UJ lUI L

CS (5 (5 FRONT VIEW OF AlN£L. .,

FRONT VIEW

(A) VIEWS AS MIGHT BE SHOWN ON EQUIPMENT DRAWING

(B) DIRECTIONS FROM WHICH EQUIPMENT MUST BE VIEWED FOR PREPARATION OF CONNECTION DIAGRAM

(C) CONNECTION DIAGRAM VIEWS OF EQUIPMENT

FIGURE 10-2 - VIEWING DIRECTION - TYPICAL FOR CABINET TYPE OF EQUIPMENT

It should be noted that the viewing planes referred to in this paragraph are primarily for purposes of showing terminals diagrammatically in as simple a manner as possible. For this reason, the methods of view representation are not bound by the rules governing the relationship of views projected orthographically.

15-10.3.3 Representation of Component De­vices and Parts

Symbols for connection diagrams are in­tended to represent each item or terminal of the equipment that is to be wired. Component de­vices and parts may be represented with symbols in one of two ways. The symbols may be of simple geometric shape (rectangle or circle) or the symbols may be of the circuit schematic type. When the rectangular or circular shape is used only terminal circles are shown within these shapes. The circle shall be used only when the component device or part shape closely approxi­mates a circle; otherwise a rectangle shall be used. When circuit schematic symbolization is required as shown in Figures 10-15 and 10-16, USA Standard Y32.2 shall be consulted.

41

15-10.3.4 Component Devices or Parts Sym­bol Size

No attempt should be made to show exact differences in size among component devices or parts especially when they are basically similar in shape or function. Differentiation between maximum and minimum sizes shall be accom­plished so that the largest shall not appear too large nor the smallest too small. For example, a symbol of suitable size may be used to represent similar items when physical size variation is minor. In general, the symbol shape shall be drawn as small as it is convenient to do so, consistent with a clear, well proportioned repre­sentation, and large enough to contain item or terminal designations.

15-10.3.5 Terminals Component device or part terminals, standoff

terminals and binding posts, when shown, should be represented as small circles. To insure clarity on full size drawings, a circle diameter of not less than 0.06 inch shall be used. Terminals should be shown as circles even when physical appearance differs markedly from the circular form.

PROPOSED USA STANDARD DRAFTING PRACTICES

15-10.3.5.1 Perpendicular Planes To facilitate showing terminals that are

in a plane perpendicular to the item mounting surface, the sides of the item containing the terminals may be revolved into the plane of the drawing as shown in Figure 10-3.

c 8

AXIS °rF_~:~~ON~__ -----J I 01 02-'05~09 I

i ! i 010 i ~-----~j~ _~.ti..2!I ____ ~

FIGURE 10·3 - REPRESENTATION OF TERMINALS OCCURRING IN PLANES NOT PARALLEl., TO

THE MOUNTING SURFACE

15-10.3.5.2 Terminal Boards or Strips The terminals of terminal boards or strips

may be represented in one of three ways: (a) as circles enclosed in a rectangle, as shown in Figure 10-4(A). (b) without enclosing rectangles and with the terminals arranged in an order convenient for wiring; see Figure 10-4(B). (c) as subdivided rectangles, where the sub­divisions represent terminals; see Figure 10-4(C).

15-10.3.6 Arrangement of Component De­vices or Parts

The arrangement of symbols in the diagram shall closely approximate the relative location of the items as shown on the assembly drawing or as located on the actual equipment; see Figures 10-1 and 10-2. Within reasonable limits, symbol placement may differ from the actual arrange­ment in order to avoid unnecessary crowding of connecting lines and designations, or to simplify the layout.

15-10.3.6.1 Critical Location When part locations are electrically cri­

tical to the extent that locations must be speci­fied precisely, a two or three dimensional delinea­tion may be used. This delineation shall show the relative location of the critically sensitive parts and wiring with respect to other parts, wires or areas. For this purpose, the outlines of

42

(A)

(B)

(C)

R

s A o

FIGURE 10·4 - REPRESENT ATION OF TERMINALS ON TERMINAL BOARDS OR STRIPS

the parts may be simplified, if essential informa­tion is not omitted. Notes in combination with a simplified view may be used when this method will satisfactorily convey locational require­ments and thereby reduce drafting effort.

15-10.3.7 Equipment Device or Part Orienta­tion

Diagrams shall show front views of front­connected items or rear views of rear-connected items, or a combination of both to clearly in­dicate connections. The diagram or sections of diagram shall be marked to show the appropriate view and orientation. When orientation cannot be clearly shown, reference should be made to phys­ical arrangement drawings or to supplementary notations or designations. For items which can­not be clearly located in relation to the main as­sembly, additional information should be given to assure proper connection. When an item is mounted perpendicular to a panel, the end that is nearest the panel shall be indicated. For such indication, see X designation in Figure 10-9 and note for R2 in Figure 10-10.

15-10.3.8 Designations Designations for equipments, it~ms, com­

ponent devices, parts, etc., shown on Connec-

~ '"j,

ELECTRICAL AND ELECTRONICS DIAGRAMS

tion Diagrams shall correspond to those shown on the associated Schematic or Elementary Diagram.

15-10.3.8.1 Axial Lead and Pigtail Parts Identification of lead-mounted parts is

preferably indicated by showing the part designa­tion within the part symbol outline; see Figures 10-12, 10-17, and 10-20. For all other parts, designations may be shown either outside or in­side the part symbol depending on preference.

15-10.3.8.2 Terminal or Wire Designations Terminal and wire riesignations shall

agree with designations assigned on the related Schematic, Elementary Diagrams or Assembly Drawings. If these designations have not been assigned on tne related drawings, then the in­dication of them on the Connection Diagram shall agree with markings on the equipmen t.

15-10.3.8.3 Wiring Tie Point Designations Terminals which are used as wiri;og tie

f10ints or connection points, but which are not identified on the Schematic Diagram, shall be as­signed ccWT" numbers on the Connection Diagram. For example, WTl, WT2, etc. See Figures 10-20 and 10-24{B).

OC R£l 4-12"

o o

o o

200/5

~~oo OHM

AM O-I50A

o o

FIGURE 10-5 - DEVICE OR PART RATING, TYPE, RANGE, SCALE INDICATION

43

15-10.3.9 Device or Part Rating, Type, Range or Scale Indication

Rating, type, range or scale of a device or part should be indicated as shown in the ex­amples of Figure 10-5. To assure correct iden­tification, the rating of circuit breakers, contac­tors, instrument transformers, fuses, resistors, etc., should be located close to the associated symbol, or shown in tabular form. The type, rating, range or scale of protective relays, in­struments, meters, etc., should be located within or close to the symbol unless this information is provided on other drawings or documents to which reference is made; see also Figure 10-15.

15-10.3.10 Wire or Cable Size and Type

15-10.3.10.1 Identification The preferred method of identifying wire

and cable construction is by means of a drawing note. In such a note, the general rule is to iden­tify the wire size. The type of wire construction may be specified by code or specification num­ber. Several typical forms of wire identification covering various wire items are given in the following examples along with an explanation of each item of identification.

Direct identification of No. 14 American Wire size ...•.... 14AWG Gage Wire

Direct identification of size •••. 0640 diameter (14AWG)

Direct identification of size and type of insula­tion .....• 22DNCCB

Identification of size directly and of insula­tion by code or specifi­cation number .•• L20P

Identification of size and type of insulation with code letter ..•• B

Nominal dia .0640 No. 14 AWG wire

22AWG wire with covering of double nylon, single cotton, and cotton braid

One pair of 20 AWG wires with covering per code L or Specification

Wires per B code covering size and type

15-10.3.10.2 Method of Identification on Diagram

When all or most of the wires on a Con­nection Diagram are of the same size and type, wire specification shall be given in a drawing note, for example: ALL WIRES SHALL BE 22AWG STRANDED PER (Spec. No.) UNLESS OTHERWISE SPECIFIED. Wires which differ from the general specification covered in the note may be identified directly on or within the feed line; see Figures 10-10 and 10-17. This may be done also with a leader line

PROPOSED USA STANDARD DRAFTING PRACTICES

directed to the feed line, see EU designation at part location 13 in Figure 10-20. In the tabular type of Connection Diagram, this information shall be shown in the appropriate column.

15-10.3.10.3 Wire Color or Color Code Placement

Wire color designations (15-3.11), whether letters or numbers, shall be placed, in general, at both ends of a connecting line or as near as possible to each terminal end. However, a single appearance of the color designation may be suf­ficient when the ends of a continuous connecting line are obvious. When wire color is the only wire data shown on a connecting or feed line, the color designation may be shown within the line; otherwise the data should be shown above the line.

15-10.3.11 Direct or Surface Wiring The designation "DIR" (direct wiring) or

"SUR" (surface wiring) applies to wiring which is not part of the cable assembly (wiring harness) but which is run from terminal to terminal accord­ing to the following methods: (1) DIR - wires run directly from termin~l to terminal with a minimum of slack. (2) SUR - wires run from terminal to terminal in the most convenient manner. When it is neces­sary to distinguish these wires from wires which are included in a cable assembly, the designa­tions DIR or SUR should be used to identify these wires as being apart from cable assembly wires.

For typical examples of DIR and SUR wire specifications, see Figure 10-17 and for typical drawing note, see Figure 10-20, note 3.

15-10.3.12 Critical Wiring When circuit functions are so sensitive as

to be affected by wire path, direction, or position, the wiring involved is regarded as "critical." Critical conditions may involve not only wire path but also positioning of pigtail parts which mount by the leads furnished; see 15-10.3.6.1. Such critical wiring requirements can frequently be covered by drawing notes. However, in ex­ceptional cases, a two or three dimensional de­lineation drawn to scale may be required for a more precise specification of requirements.

15-10.3.13 Leads - Pigtail (PGT) The term "pigtail lead" is used in re ferring

to leads which are furnished with the item and are permanently connected to it. When it is ne­cessary to distinguish these leads (usually when colored and of the nonaxial type) from other wir­ing, the leads shall be designated PGT. When it is readily apparent that the PGT lead is of the axial type, the designation may be omitted; see

44

Figure 10-17, parts designated respectively T2 and R2.

15-10.3.14 Phasing Indication Phasing of alternating current equipment

should be indicated so that there is general agreement with the actual physical arrangement and suitable notes shall be used when necessary; see Figure 10-16. When physical arrangement is not the governing factor, the phasing should be indicated in sequence 1, 2, 3, N from left to right or top to bottom.

15-10.3.15 Polarity Indication Polarity 0 f direct current devices should be

indicated with a P or + for positive, N or - for negative, and PN or ± for neutral; see Figure 10-15. Direct current busses should be shown in sequence positive, neutral, negative from left to right or top to bottom when physical arrangement is not the governing factor. When it is necessary to indicate the polarity or orientation of term­inals, the feature whereby the polarity or orienta­tion is indicated on the equipment, device or part shall be noted on the diagram; see CRI and CR2 in Figures 10-12 and 10-20.

CONNECTING LINES

/J~ " ~ ~

" " ( ) "~/~HOL£

(A)

/

CONNECTING LINES

(8)

"

FIGURE 10·6 - METHODS OF SHOWING PASSAGE OF CONNECTING LINES THROUGH HOLES

15-10.3.16 Holes Openings, circular or otherwise, in mounting

surfaces through which wires pass shall be indi­cated with a phantom line and identified as HOLE 1, HOLE 2, etc.; see Figures 10-17 and 21. When connecting lines representing the wires are shown passing through the hole, the lines may be drawn to the edge of the hole or run across it depending on which method is more convenient for the type of Connection Diagram bein$ prepared. The method of Figure 10-6(A)

ELECTRICAL AND ELECTRONICS DIAGRAMS

should be used when a hole is shown in separated' views (principal and auxiliary) on the drawing. In this method corresponding feed lines should be identified with wire color or other wire data. The method of Figure 10-6(B) should be used when a view is rotated in place as illustrated in Figure 10.20.

15-10.3.17 Additional Cable Stitch Indication The designations STl, ST2, ST3, etc., are

used to indicate additional cable stitches when such additions are required. The additional stitch designation is intended to be used when several wires of the same color connect to the same item as shown in Figure 10-7. At installation and dur­ing maintenance, connection of these wires is considerably facilitated if the wires of like color emerge from the cable body at separate cable stitches, rather than from a single stitch as would normally be the case. For a typical ap­plication of an additional designation, see yel­low wires connecting to electron tube socket XVI of Figure 10-17. The need for additional stitches should be avoided, if possible, by the proper choice of wire color. Loops such as il­lustrated in Figure 10-7 require only one stitch.

CABLE STITCHES IN ADDITION TO REGULAR STITCH (REQUIRED TO SEPARATE WIRES OF SAME COLOR THAT WOULD OTHERWISE EMERGE OUT OF SAME STITCH)

FIGURE 10-7 - VIEW OF TYPICAL CABLE SECTION SHOWING REGULAR AND SERIES OF

ADDITIONAL STITCHES

15-10.3.18 Prewired Connections Prewired connections may be indicated by

anyone of the following methods: (a) Dash lines used for indicating con­

nection from terminal to terminal with no regard as to whether the lines are shown inside or out­side of the symbol outline.

45

(b) Solid lines shown within the symbol outline.

(c) Drawing note directed to connecting line with a leader line indicating that connection is prewired.

Method (a) or (b) should be supplemented by a drawing note explaining the line symbols used. Solid lines outside of the symbol outline shall always indicate wiring which must be provided. F or typical application of method (a) see Figure 10-17 and for method (b) see Figure 10-13.

15-10.3.19 Twisted Wire Designations To indicate that two or more wires are

twisted, letter designations may be used in ac­cordance with the following:

P - Two twisted wires, Pair T - Three twisted wires, Triple Q - Four twisted wires, Quad

For typical applications of the symbol for pair, see Figures 10-10, 10-11 and 10-20.

15-10.3.20 Symbols USA Standard Y32.2 electrical and electronics

diagram graphic symbols frequently used for wir­ing on Connection Diagrams are shown in Figure 10-8 for ease of reference.

15-10.3.21 Drawing Notes Drawing notes should be placed preferably

at the right side of the drawing sheet, as shown in Figures 10-10, 10-19, and 10-20. In general the notes may include information on: (a) wires which are included in or excluded from the cable assembly (b) soldering procedures, if any, which need to be specified (c) such wiring designations or symbols which need to be identified or explained (d) gage and type of wiring (e) any additional wiring information or instruc­tion.

15-10.4 Continuous-Line Type

15-10.4.1 Point-to-Point Diagrams In point-to-point Connection Diagrams,

separate connecting lines represent the actual terminal-to-terminal connections which are to be provided on the equipment; see Figures 10-9 and 10-10. On this type of Connection Diagram, con­necting line layout or arrangement is not in­tended to convey actual or preferred conductor path location. However, connection sequence should be determined on the basis of the most suitable path from terminal to terminal and ac­cording to whether wiring harnesses, raceways, cleats, etc., will be provided. Another determin­ing factor will be whether the path of cable (harness) is indicated on the Assembly Drawing.

PROPOSED USA STANDARD DRAFTING PRACTICES

",--INCICATION • .$PL Ie £ OO;T IW~:fL

~PLICED CONNECTION

CABLE (PREFABRICATED)

SHIELDING FOR WIRE OR CABLE

-t-t-t-F-CONNECTION TO ~HIELOING

COAXIAL SHIELD CONNECTION

~ ))))

l ))))

I I I I GROUPING OF CONDUCTORS

FIGURE 10-8 - GRAPHIC SYMBOLS COMMONLY USED ON CONNECTION DIAGRAMS

46

15-10.4.1.1 Application The point-to-point method is useful mainly

for the representation of wiring information for the less complex equipments that may consist of relatively few items. If use of the point-to-point method results in a diagram difficult to read be­cause of the number of adjacent and crossing connecting lines, another of the subsequent methods in this standard should be considered.

15-10.4.2 Highway or Cable Diagrams The Highway or Cable Connection Diagram

is basically similar to the Point-to-Point Diagram with the exception that groups of connecting lines are merged into lines called highways or cables in stead of being shown in their entire run as individual line.s; see Figures 10-11, 10-12, 10-13, 10-15 and 10-16.

15-10.4.2.1 Feed Lines From the component device or part termi­

nals, short lines which will be referred to as "feed lines" are drawn perpendicular to the high­way or cable line. At the point where the feed line enters the highway or cable line, direction of wire run in the highway may be indicated when necessary with an inclined or curved line; see Figure 10-11. Crossovers of inclined or curved portions of feed lines should be avoided by choice of angle or radius.

15-10.4.2.2 Wire Data When wire data is shown on feed lines,

it should include wire destination (item refer­ence designation, wiring path number, or lead designation) and if required also wire color, code, or type. This information may be shown adjacent to or within the feed line; see Figures 10-12 and 10-16. If wire data(color, type, etc.) is not speci­fied on feed lines or in drawing notes, this in­formation shall be shown in a separate wire data list. This list may appear on the same sheet, or on a separate sheet of the same drawing or on a separate drawing.

15-10.4.2.3 Highway or Cable Lines In highway layout, unidentified branch­

ing points shall be avoided. Either additional highways or a method of branch identification such as shown in Figure 10-13 should be used. More than one highway or cable line may also be used to facilitate indication of wire runs or to indicate grouping of particular wires into cable assemblies (harness); see Figures 10-12 and 10-13.

Another use of a separate highway or cable line is to indicate which wires have to be segregated for electrical reasons. A drawing note with the aid of a symbol, if necessary, shall identify the highways or cable as being part of the same or different cable assemblies.

ELECTRICAL AND ELECTRONICS DIAGRAMS

AM

,A 9 A

S'-~ 51-2. 51-1 X

I ,5 I ,,~ 2J ,,~ '2.' 2. ~y ---ro < -- ) ~r 3 I ~ ,

4

5 ...... " - 7

8

FIGURE 10·9 - TYPICAL POINT·TO·POINT CONNECTION DIAGRAM

15-10.4.2.4 Critical and Segregated Wiring Critical wiring shall not be included in a

cable or highway line, but shall be run separately in accordance with 15-10.3.12. Wires which must be segregated for electrical reasons from other wires but which are not otherwise critical may also be shown separately or run directly from term in al to terminal.

15-10.5 Interrupted Line Type

15-10.5.1 Basic-Line or Feed-Line Diagrams In the base-line and feed-line methods of

preparing Connection Diagrams, connecting lines start at a symbol and are interrupted a short dis­tance away. In the base-line method these lines are terminated in a base line for convenience of alignment, while in the feed-line method, no base line is used.

Point-to-point continuous lines, if used, are limited usually to the indication of short­connection runs between terminals of the same or adjacent parts or to the indication of axial-lead part connections. Except for these uses of con­tinuous lines, continuity between the interrupted lines is conveyed by destination information at the ends of the feed lines. This destination may be given as letters or numbers which locate the

47

symbol on the diagram. Connect ion continuity may be further facilitated by the indication of wire colors on the feed lines. Wire color indica­tion is particularly helpful when several wires emerge from a cable arm as a group and connect to a cluster of terminals on an item.

F or explanation of nomenclature applicable to the base-Line or feed-Line methods and for typical Connection Diagrams prepared according to these methods, see Figures 10-17, 10-18, 10-19, and 10-20.

15-10.5.1.1 Layout I n addition to representing relative com­

ponent device or part locations, space between symbols shall also be provided for the accom­modation of base lines and feed lines.

15-10.5.1.2 Component Device or Part Locations - Base-Line Method

For the establishment of item locations in the base-line method, location numbers shall be assigned in numerically ascending sequence starting with one, from left to right and top down or equivalent logical order. When required, loca­tion numbers may be assigned on the basis of major mounting surface divisions, but following

£3 81(

R

£1 GY

p

S£ENOT£ 4-.

PROPOSED USA STANDARD DRAFTING PRACTICES

________________ ~rE~s~rScrcOv~E~R~ ____________ __

RI

G

BR

8R BR R

_I-+ __ ~_HING£ LIM_E ______________ _

HICKEL -PLATED TERM.

BK,SUR 67 V,SUR,'7

AI,

(NOr FURN)

JI

R2

MDUNTING SURFACE

......... ----+-----+ rOBE CONN£CTED

DI

PGT

NOTES:

1. UNLESS OTHERWISE SPECIFIED, ALL WIRES ARE INCLUDED IN THE CABlE ASSEMBlY XXXXX.

2. I TEM NUMBERS REFERRED TO ARE SHOWN I N PARTS LIST OF ASSEIoIBl Y DRAWING XXXXX.

3. ALL SOl.OERING SHALL BE IN ACCORDANCE WITH OO-S-52" METHOD C.

". SPLI CE AND SOl.DER AND WRAP WITH ONE LAYER OF TAPE ITEM 59 AND TWO LAYERS OF TAPE ITEM 60.

5. SUR-WIRING-WIRE TO BE DRESSED BACK AND RUN ALONG THE MOUNTING SURFACES IN THE MOST CONVENIENT MANNER.

6. PGT - LEADS FURN I SHEO WITH PART.

69,1()

TI

I 2 J 4

FIGURE 10-10 - TYPICAL POINT-TO·POINT CONNECTION DIAGRAM AND NOToES

48

Tal BY CUST()NER

ELECTRICAL AND ELECTRONICS DIAGRAMS

f: DESTINATION flWIRE TYPE S¥M90L

TERt.:INAL NO. WIRE COLOR CODE REF DESIG OF COMPON7NT ] / r INCLINED LINE INDICATES

T8J . J 1 RUN DIRECTION S4

I X 1-1- 8 T8J· 4- C6 / 2

2 0 o 3 o 4 S4-I-C6

T83-/-829

FEED LINE (A)

(WIRE TYPE rW1RE COLOY WIRING PATH NO.

T8J SYMBOL I / _ S4

8 Rw 19 10 BL C

2 o 3 o

C 8L

CABLE OR HIGHWAY LINE

)(05/

B

FEED LINE (8)

~.D DESIGN.TION

~---------WI P2-----------~

QWHM m

------P2 CJ Ie)

FIGURE 10-11 - METHODS OF INDICATING FEED LINE WIRE DATA AND DESTINATIONS ON

HIGHWAY OR CABLE CONNECTION DIAGRAMS

the left to right and top down numerical sequence within each division; see Figures 10-19 and 10-20. Location numbers are not assigned to items which can be shown connected on a point-to­point basis and for which feed lines will not be brought into the base line; for example, see R2 of Figure 10-17 and WT1, WT2, etc., of Figure 10-20.

15-10.5.1.3 Component Device or Part Locations - Feed-Line Method

For the establishment of item locations in the Feed Line method, each item is assigned an individual arbitrary alphabetical designation. The letters can be assigned consecutively from left to right and top to bottom or equivalent logi­cal sequence. Connections are conveyed by means of a short feed line from item terminals followed by the item designation and terminal to which it is connected; see Figure 10-18.

49

15-10.5.1.4 Location Numbers and Letters Location numbers and letters should be

made bold and approximately twice the height of the lettering used in the body of the drawing. Location numbers and letters should be placed above the symbol slightly to the left.

When items are shown joined, it may be more convenient to show location identification within the symbol outline, generally in upper left hand corner; see Figure 10-19.

15-10.5.1.5 Additions Location numbers and letters may be re­

served to allow for future additions. For items added between two existing consecutively lo­cated items, identification may be shown with dash numbers or some similar distinguishing method.

15-10.5.1.6 Base-Line Representation Base lines shall be conveniently located

with respect to the symbols. When it is desired to specifically show that a diagram pertains to a particular circuit, the base line may be shown continuous, or it may be broken into segments in such a manner that continuity is maintained through linking feed lines. The presentation of such circuit distinction or unity is illustrated in Figure 10-20.

When indication of circuit unity on a con­nection diagram is not a consideration, the base line may be broken into as many separate base lines as may be convenient from a drawing layout standpoint without necessarily linking the base lines through feed lines.

Location numbers may be shown adjacent to the base line instead of adjacent to or in the symbol. Identification of the base line with loca­tion numbers may be advantageous when the ar­rangement of the component device or part ar­rangement on the equipment does not conform to a uniform ( mounting plate) or symmetrical pat­tern. A thick or an extra thick line may be used for representing the base line when emphasis of this line is desired.

15-10.5.1.7 Feed-Line Representation A single feed line may represent more than

one wire to a terminal if clarity is not sacrificed. When this is done, it is recommended that the feed line represent wires of the same gage and type. When the base-line method is used, feed lines which terminate at the base line from opposite sides shall not intercept the base line at the same point, but shall be staggered to avoid the impression of circuit continuity through the base line.

V\ o

)

u ] 1~ 8 JJp '] g~ 8\ A 3\2\1\ .\,] 781 ", !... G I ~

.... e 2 R ~ ~

~

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~ ~1~lct

~ 3 3 BL 14

~ 4 ~ 0 "I et) ...... U SSG 6

~ 6 6 &-0 i:l ,xVI

~ l' ~ BK 2

8 8 R-O i" .......

()

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b2 56 , 7'

" ~

51 5 6

:t

J .4

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~I ~ rt

i ~ I:> 'I

~

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O~~ 00\~

~"'Oo-­O"'~O

~~~ L.........J'

" il ~

~ ~o­",0

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()

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161.-p I I '~/5

I 11/ 12\ ~3 ~ • 5\ 114\ ~ A 121. 4\ 14) 1 ,

~

12 15. B 1.3)

1/\10\

rBZ

.... r'o r BL-ti 7..... !Ie 0 \J II I! BK 6.....

~ 12 5 BL 5 <:S 0 .....

~ 1.3 ~ G 4 ......

~ 14 7J 0 II .....

... 15 HI 8K 10 ~ 0 ~ '6 51 BR 13

~ 17 ~ R 121

1(4

~ ~

11)

ct l: ci:

~b~~b:; .. ~:~o'o ~ Q)

~?~9109If)O't ""9"''''

()

Q: ~ 6

~ ~

()I ~II~ * '-T

~~ .. v ~ K.3

~ C\l

~ ~

~ ~,

~

O"'~O o;~o 0 .... 1:00 Olf)-«>--0..,,,.0 0 ... "'0

~

()I~

IOc RI L-o

\) ~

FIGURE 10·12 - TYPICAL HIGHWAY OR CABLE CONNECTION DIAGRAM

J

PllRT S VIIIRED FROM FRONT OF BAY

6( 4f .3

"I ~I ~

~O"'O'"

9(51

"'1;' Il)\~

/<'1 fiR

~OC\lo ....

Q:

~I q)1 ~I "

)

~

~ ~

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~ :> ~ o o ~ :> "t1

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~

~ n d n trJ en

ELECTRICAL AND ELECTRONICS DIAGRAMS

~'-3 ~r--~._z----r-~ -~SI_1 ~~ TT~ ~ I TP S , TP ~ , TP

:2 T ,t" ,t T

Q~ Q~ ~Q lei ______ ~"~I~ ______________ ~!I~I~ ________________ ~I~I IC.~ 1(."

It:'

AS

87X VARM

WM.

WHM

T N _ ~ ~ - <If! N PI

tC~~ Q, Q, ~ ~ Q, Q, Q, PZ

~iJ~-.lL....L....L:, -:"-:"-=--:"-:"-:"~j ~I...ullw-I:-\;-:_----'~-r-Lr'-'-T--ri --r-"j -..u.11..IL.11 ---L1I1-------4[:: , u - = «« ~e i. t- C U R

I "4 )K Z

~ o~ 4e-4

SS CS

'U J n PI PZ P", TP ,. G

PI pz P~ 2 ...

r:~ PZ P!.

RELAY AND CONTROL PANEL - REAR VIEW NOTES:

1. ALL WIRES ARE 14 AWG. 2. CONNECTIONS SHOWN COMPLETELY WITHIN OUTLINES ARE PREWiRED.

FIGURE 10·13 - TYPiCAL HIGHWAY OR CABLE CONNECTION DIAGRAM -RELAY AND CONTROL PANEL (SEE ALSO FiGURE 10.14)

51

AS

CONTACTS HANDLE END

'~~l2 I

2

1~~l4 3

4

~~L6 5 6

C5

CONTACTS HANDLE END

I IC 2~ 2 I ~~ ~

2

~~~~3 4

SS

CONTACTS HANDLE END

I IC 2C 2 I o--t~ o-I~

2

3 3C 4C 4 3 ~ H 0-1 t----o

4

PROPOSED USA STANDARD DRAFTING PRACTICES

VS

POSITIONS CONTACTS

3 2 I HANDLE END

X X

X

X X 'r-4 IC 2C 2 ~ o--t

X

X X ~ 3C 4C'L 4 ~ o--t.

X

WHM

POSITIONS

CLOSE NORM. OPEN

X

X

X X

X

WM a VARM

POSITIONS

ON OFF

X

X

X

X

POSITIONS

3-1 2-3 1-2 OFF

I X X

2 X X

3 X

4 X

51

67G

2

SEAL-IN ELEMENT __ 1_-,

CURRENT

PO~IL-+~_,.,

8

87X

268 12

AUTO TR-FV

FIGURE 10·14 - INTERNAL CONN ECTION DIAGRAMS FOR FIGURE 10·13

52

)

MV BUSHING

COUPLING ,-­CAPACITOR HOUSING

I I

GRD TERM.

O~rfSJ~~~~G

VI Vol

MV BUSM,NGS

r-u~ LnJ

IISK-V PT

""I-V~ I

I 5 3

L

,

~ IY4 IY~

3vi" m 3'(3 3Y4 3vS

SVT Sv2 !;'Y3

~ 5vS

ALL WIRES ARE 14 AWG UNLESS OTHERW ISE SPECI~IEO

(+1(-)

WIRE SHOWN BY HEAVY L.INES DEVICES ON ARE 6 AWG MECMANISM

52?~III~IS CC TC 14

9

~1--+I-co)o~-f~1--<l I I 0 10

7

51

52

53

54

55-

5t,

57

58

59

60

7 '-5

2.5 3'-

BREAKER MEeHANISM HOUSING - FRONT VIEW

FIGURE 10-15 - TYPICAL HIGHWAY OR CABLE CONNECTI9N DIAGRAM - BREAKER MECHANISM HOUSING

.~

rr1 t"'4 rr1 n t-i ~ n F= ~ 0 rr1 t"'4 t'l1 n t-i ~ 0 Z n en 0 -> c;') ~

~ en

PROPOSED USA STANDARD DRAFTING PRACTICES

FRONT VIEW

LOW VOLTAGE PANEL ,--

PB

START ~~~

STOP[~

'=' AC

POWER

REAR VIEW

L3 &

9 LI3

3

:~rr l' L31

t :~

----'"\

r9, T3T2 TI

§

P--l lO] TI

L32] T2

lO] T3 I

I

__ L __ ~ I

FIGURE 10·16 - TYPICAL HIGHWAY OR CABLE CONNECTION DIAGRAM

54

~

PRE. I RED ELECTRON BUS NOTE T WIRES TO T6

[

PART \ ASSEMBLY TUBE CAP ((STRAP) SHALL BE RUN LOCATION FOR VI ~ THROUGH HOLE I NUMBER f:- BUS (STRAP) ITEM NUMBER

PIGTAIL PART~ ~ SLEEVE ITEM NUMBER

rART

~~ ~ flit ~ DIRECT .,R,NG mm:~~ON ", 4 t I \ KVI 7 jl/SHIELO "-..R .. R3 30 / TERMINATION OF

I . J _ SHIELDED ADDED PART ~ :s 6 \ 7 CONDUCTOR

FEED LINE ---.. ~ I I NOICA

7T1ON - -

I I

COLORED ~ I I II r - - - - J : 5-1 PGT SECONDARY PIGTAIL "'-JR41 ~I 3 E2 CABLE '" WIRE _ ~ XOSI INDICATION ,...

I p '" PGr ~ CO t--. (Q ~

WIRE COLOR ASSOC " Q) <>: <>: <>: STI'"""-'ST' STITCH _ WITH DESTINATION- <>: <>: '" ~ "":::' n LOCA TI ON NO. 8 .).. ~ :::. <>: ~ '" V) "> "> ~

~ '? ;;; NOTE 7 ~ 'l: It

. , RE COLOR ASSOC oJ .: .... 't ~ '< '< i:: '" • 'l: Q) s:: WITH DESTIJfATIOJf - ~ I ~ I , 9 Cl) co '<::..: ' , }... ~ ')... I 0 LOCATION NO.' :...._---,,,, \!) <>: '" <>: '< <>: '" '" <>: Q) '" '" <>: '" '" It LETTER SUFFIX '"

USED .HEN ,... ~ ADOITtOJfAl m

DESTINATION-LOCATION "'_ « '" ~ ~ -;- « FEED LINE n NUfrotBeRS IDENTIFY ~:::::: ~ ~ \,0 \0 '\J..Q ~ :::: ...... \r) ~ 'II- It) I.t) ~ ~ IDENTIFICATION ~

PART L.QCATI ONS '1.0 \() \(l ~ ....... 1 S REQU I REO 6 TO WH I CH FE£II 1 - '\ '" .;, Z II NES ARE BASE \ \ n DIRECTED LINE CABLE OR HOLE ' ....... _ , ~ V>

'P CORD SYMBOL '< ::: 0 ).. '" ,<" Q) Q) ;:

SURFACE WIRI NG ----~;;_;;;;rn:;;_::::.::--I--_ PA I RED . \RES Cl

ITEM NUMBER ----- ~ (;mlD ~ ~ ~ ...... SYMBOL V) V') PGT P (/)

/0 ( II 12 T/ T2 T3 rl--Tt---Tt-~ TERMINAl

o 0 DESIGNATION , 2 2

FIG URE 10-17 - EXP L ANATION AND APP LI CATION OF BASE- LI NE CONN ECTI ON DI AGRAM NOM ENCLATURE AND METHOD. USING A POR TI ON OF A TYPICAL DIAGRAM .

(BASICALLY THE SAME FOR FEED-LI NE METHOD, SEE FIGURE 1O - 1B)

PROPOSED USA STANDARD DRAFTING PRACTICES

C AM

FG,A4~E~ o D 51-3 E 51-2

5 , (0 2

) ;l

F 51-' x

5 CO 2

l ~ ~ ~ - t\J

A FS E5 D5

C2 F2 lJA

UA UA

3 4

I ~ w u ~ u ~ L __ __ ~_~_.~_ ... ____ ~_r-<l_-_~_"'_~_ .. __ _ 7 8

FIGURE 10-18 - TYPICAL FEED·L1NE CONNECTION DIAGRAM

15-10.5.1.8 Wire Color Indication Wire colors, when shown, shall be indi­

cated on each feed line. On a feed line that represents two or more wires, each of a different color, the colors shall be indicated in the same order in which the destination location numbers appear on the feed line, see Figure 10-17, Rl. When the wires are mostly of the same color, the colors shall be covered by a drawing note; see Note 2, Figure 10-20. In general, the wire color should be shown approximately midway on feed lines.

15-10.5.1.9 Wires - Pigtail Bare pigtail wires furnished with the parts

shall be run directly to terminals on a point-to-

56

point basis whenever po ssible. Insulated pigtail wires furnished with the parts shall be designated C cPGT." Colors of colored pigtail wires shall be indicated on the feed lines; see Figure 10-17.

15-10.5.1.10 Letter Suffixes for Wire Iden­tification

When two or more terminals of one part are to be connected to terminals of another part with wire of the same color (surface or direct wiring); a suffix letter shall be added to the feed line destination number as a means of differentiating similarly colored wires; see Figures 10-17 and 10-20.

VI --.J

5 51

21 1<.3

... 10 ", ...

-p---" I!I 11)->- )..~

J

t:,~: ~ ~~ <>-

TALK

:::g bl :i':::. 0(;.3 (:) 8,30

I/)

ci: II)

_P--o

0\ !? ~ ~ ~ lil

IS'

'" .... lc

).. CQ <:I ~

~~ ... "10<\1 ...

~1'" 'It II") '\I ...

I I ~ ~

""II.? Xl ~ ~ qj "" "" '" <\j

11~ ~ ~ '\I <\I '"

~ '" ~ ~ ~ .. ....:

TO NOTES: ANSWERING TO JACK AND MONITOI? LAMP CKT POSITION

TO INC TRK

CKT

TO NIGHT AI.M ( 1<7

r- BUS !3,ARS ON nl5E PANEL, I. ALL WIRES SHALL BE 24BH UNLESS OTHERWISE SPECIFIED.

' .... It II) ::;\~ \ \. ~I -.I CQ

i'4C <= ~24C IN CA 24C ~ IN CA IN CA ~ ~

WIRES CONNECTt:D FROM 1 FPONT OF t:Q(lIPMENT :....., r------< ~. TBj ( 18 Z8 M( 17 Zl ~l E O/6026()3b IS02S< 3S 3 OI40Z403~OI30Z30.33 4 OI20ZZ03Z(.( I (~

~ ~

\!) -.I .... l; lc

).. ).. \!) 'Il CQ ~ I.!\ ~ ~ II: q)

p----< ~

~ ~ ~ ;;; '<l '<l iii i\J ~ ~ ~ ")1<>'" ::: ~ ~ ~ ~ 'It ~ CIJ t\j

~ ~ ~ ~ <\l I\J '" iii <1\ ~ ~~p o--P_ p- ---0

): l:

oJ\!) .... \!, Il: It -b III ~ Ill';"'" II) ~ \!) II) '" I.!\ <:) '" co \;)

6 7 8 9 10 II 12 13 14 15 16 17 .II / 2 3 C4 C3 C2 CI R6 R5 R4 R3A R2 RIA LI 4

C)

~ ~ ~ ~ ~ ~

~ ~ ~ q: \!) II) ~

io-i--hi 22 l;; ... It) t\j "'1' 1<2 P

~ <\I ... ~ I ~

II: \!) ,..

' IQ \j) I\J ........

~ ---0

R.3B RIB .3

p

\I) \!)

~ ~ II) ~ II) Q Ii) ~ C) ~ ~ l{l

o--p---o

'" '" ~

'" ~ ~ '\' I\J "" '0 "- C\j 7, ~ <\) ~ ...... f <Ii ~ C\j ;\j i\j ~ ~

It ~ II: 11) Q II: III ~ C) II)

~1 ~ ~ \l) \i) I .. '11'''' .... 24

~~~O) I~ ~

C( II) \!) III

'" ~ ~ ~

F IGUR E 1O~ 19 - TY P ICAl SA SE LIN E CONN ECTION DI AGRAM (FOR ASSOCIATED SCHEMATIC, SEE FIGURE 8-17)

"'I0V I I ..,,,,,

3.

4.

5.

LOOSE WIRING

~ ~~~ ~ <Ii

...

It ~ttC) III I\J ",tIlC\j >- \!)

18 3 2 I Z K6

4M--:kt ZO;;-IM A

I -

~ \I) I\J

.. '" ~ ~

"

'THERWISE SPECIFIED.

J - TOP OF KEY VIEWED FROM TERMINAL SIDE.

c==:=:> - CABLE

OR~R; NgPi ~~~~~A ~ :~~~G. PROV I DE IN ACCORDAN CE WITH

... Q '" 1Il '" '" '" ~. ~

\!) '" Q '" 11)

~ '"

19 0

K5 5 4 .3 2 I

~ ... III l\j 'II

~

lc \!) ~ C)

~f.] ~ "l01\! ...

~ 1'I)01\J0 .... 0

.J II)

~

tI1 t""' tI1 n ...., ~ I-f

n ~

CONT S2 tJ tI1 t""' tTl n ...., ~ o z n (j)

tJ >: c:;J ~

~ (j)

XXX)(X CA8LE

AS5EM8LY

P-r"

3 -f-

L6

o

-

5 XV2

CI9

R59

WT3 R57

R61

C20

8 r-r r­L7

P,CABLE ASS£MBLY P

~r-----------------~

4 ,-----C26 ;

6 WT5

~ ,;,

CABLE ASS£MBLY-

'- CA8L£ r- - ASSEMBL'1i1

lc"" QJ'"

/0 rvt+-- I T3 1..--- S

/I ~r-AT

.----------<

12 WT8 WT9

WTIO WTII

18 52

o 0 C2 CI DI02

(HIGH) (LOW)

84B382BI AI AZ 00

CABLE ASSEMBLY--+-+--+--I-i - ,- ---- -(--f- r- -~HOL[

P &. EU --I- (S££ NCTE: 6) l(

'" ~ ~ lD ~ 13j,--i-r- - ~ ZI i F2 FI G C2 CI I

I

! I I I L _____ --.l

WIRED FROM FRONT 16 Lil

14 WTlZ

1~/7 ~,WTI3

P-f---+ f·--f-o- P dt E:U

t--to--t-- CA8LE r~ -- -( =i:' ASSEMBLY

~/~ ~ '" % /9 rr"'t-+--'-I---"!j------, ARI

20 WTIS(

CABLE ASSEMBLY-+--I-+-+--i

R1 ~ ~ .. ~ ~ ~ ':!?

23 r----sff: <.II 4- 0

OJ 2 0::1-0 1

24 S/A

o o I 12 0 2 /I

3 10

25 SI8 o

2 3

o I 12

1/ 100

28 TJ!-I

I

2

4

5

6

7 o 8 o -

-

18E

180

IBc

18B

leA

18

4 90

0 5 8 0

~ SECTION

NEAREST MTG SURF,<CE

i--CABLE: ASSE:MBLY

29 PI3

fo----t--+-------- P &. E:U

I---+O~-I--+""""+--I--------"""CABLC ASSEMBLY (s£c NOn 7)

I~ 1(' /I 5 02

18 o -015 010 07 4 ~t-17 141W ~3 o

PROPOSED USA STANDARD DRAFTING PRACTICES

21 T4-

24A

248 24C

240

20A

258

25r ZS/J

15

30 r-r---XYI

1 Z

'-I-----

8 I-. C >:: o \.J

E: ~ F « G 0

H ~ oJ ;;;:

K f::

NOTES,

1. ALL W I RES SHALL BE 22 AWG STRANDED PER XXXXX UNLESS OTHERWISE SPECIFIED.

2. ALL WIRING SHALL BE SURFACE WIRING, COlOREO GREEN UNLESS OTHERWISE SPECIFIED.

3. EU - 20 AWG STRANDED WIRE PER XXXXX.

4. ------ PREWIRING.

5. AT - WIRES AT TERMINALS I'ITG, 1'lT7, ','lTIO AND WTll TO BE CONNECTED AS REQUIRED AFTER SHOP TESTS ARE COMPLETED.

6. THESE IV I RES SHALL BE lEFT LONG ENOUGH TO REACH TER­MINALS WHEfl Zl IS ROTATED 90° CCw WHEN EQUIPMENT IS TO BE RELAY RACK MOUNTED.

7. THESE CONNECTING WIRES SHAll 8E SLEEVED WITH APPROXI­MATELY 12 INCHES OF .05 DIAMETER PLASTIC TUBING.

,0------- CABLE. ASSE:MBLY

~

~ 271/?rS"I ~,---____ ,,:,x'--'-V-"'6-f:/;O- CZ) 6'f ol\--\-1Ii---__ +-...J

r : ~:)" STRAP ji - NUT

~~ '" ~ ili

v, ~

'"

OIR~

FIGURE 10·20 - TYPICAL BASE LINE CONNECTION DIAGRAM

58

(

(

ELECTRICAL AND ELECTRONICS DIAGRAMS

·,yIRE DATA J

(A) (8) (C)

f~J (F) (G) (H) (J)

TYPE

330769 331367 337821 350133

370358 33185 1226 360111

·'IRE OR ITEM

IAWG COLOR

18 G-BIC-R 22 G ·Y-BIC 18 BARE 16 It 20 Sl -- Sl 20 BAAE

-- ---20 W-A-BL 20 W-r.-Y

FROM

LG LOCATION 16.3 23 C101-2 26.2 23 C1I8-1

3.1 23 C1I9-1 18.2 23 CI?I-2

23 CHASSIS 21.0 23 JI02 2.2 23 S101A-7

-- 23 T101-12 3i.S 23 T103-5

Tl03-6

PATH TO

REMARKS NOTES LOCATION NOTES

-- -3 23 XY103-7 -- 300

-- HOLE 7, "B" 23 C127-3 -- FEEDBACK "K" -- DIR 23 XYI08-2 -- --

2 -3 23 TB103-38 2 VOICE 3,6 23 TB103-39 4,5 7 -3 23 P204 8 If INPUT I 9,FL DIR 23 S101B-3 -- --

10-1/2" -- 23 XV101-3 10-1" ---- -3 23 TBIOI-I 11 UGN OUT

-- TB101-2 II

-

WIRING CONDITIONS FOR DATA AS INDICATE ••

!Al SINGLE WIRE IN CABLE- (F) COAX LEAD TO COAX FITTING e SINGLE WIRE - SURFACE WIRE (G) SLEEVED STRAP WITH FULL C SINGLE WIRE - DIRECT LENGTH SLEEVE-D SHIELDED WilE - LEAD (H) PART ADDED AT WIRING-E SHIELDED WilE - SHIELD CONN (J) PAIR

-USUALLY FOUND IN CHASSIS WIRING ONLY

NOTES:

I. WIRES SHALL 8E RUN AND TERMINATED IN ACCORDANCE WITH SPECIFICATION XXXX UNLESS OTHERWISE SPECIfiED.

2. TERMINATE IN ACCORDANCE WITH fiG. A OF SPECIFI-CAT ION YYYY.

~. SHIELD CONNECTION SHALL BE 2 IN. LONG.

4. SHIELD CONNECTION SHALL 8E I, IN. LONG.

5. USE WIRE TERMINAL 2222-31.

6. SOLDER DIRECTLY TO CHASSIS AS CONVENIENT, WITH­IN ONE INCH Of SHIELDED CONDUCTOR JUNCTION.

7. TERMINATE PER SPECIFICATIO~ WWWW, FIG. 12 (UG-2731/U) •

8. TERMINATE PER SPECIFICATION .wnw, FI~. j~.

9. USE SLEEVE, SPECifiCATION VVVV, Of SIZE AND LENGTH SPECifiED (FL INDICATES fULL LENGTH BETWEEN SOLDERED CONNECTIONS.).

10. USE SLEEVE, SPECifiCATION YVVV, 26 SIZE, OF LENGTH SPECIFIED.

II. USE '1I1RE TERMINAL ZZZZ-···j.

-FIGURE 10-21 - COMPREHENSIVE METHOD OF TABULATING WIRING CONDITIONS

15-10.6 Tabular Type In the tabular method, wlflOg information is

arranged in tabular form (sometimes called a Running List) rather than shown on feed lines of a diagram; see Figures 10-21 and 10-25(A). Such tabular listing of wiring information may be ac­companied or supplemented with component de­vice or part locational information shown diagram­matically; see Figure 10-22. However, when loca­tions within an equipment can be readily de­termined through the application of a coordinate locational system established for the equipment, the diagrammatic information may be omitted en­tirely or reduced substantially.

59

15-10.6.1 If/iring Information Arrangement Details of tabular arrangement of information

and number of items covered may vary with in­dividual needs. The following basic information shall be included as applicable.

(a) FROM-TO Information. The terms "From" and "To" are used to differentiate between the ends of a connection. "From-to" information shall include the identity (location and designation, terminals, etc.) for each connection point end. Notes, manufacturing information, etc., may also be included in the connection point infonnation.

(b) WIRE Information. Wire information shall identify the wire size and type used for each

PROPOSED USA STANDARD DRAFTING PRACTICES

C.ABLE PATH

o

T82 [3] CI

~ I

~I o8T

1) TBI I ICllI o .' t,

c~'T81 0 -SEE FIGURE

/ 10-22(8) LEFT SIDE VIEWED FROM INSIDE

RE~R VIEWED FROM INSIDE

RIGHT SIDE VIEWED FROM INSIDE

CABLE PATH

FRONT VIEwED FROM INSIDE

(B) PART ORITENT ATION, TERMINAL ARRANGEMENT, AND IDENTIFICATION OF ASSEMBLY D

(A) SIMPLIFIED DIAGRAM SHOWING RELATIVE LOCATIONS IN A MAJOR EQUIPMENT

FIGURE 10-22 - DIAGRAM SHOWrNG RELATrVE LOCATION OF ITEMS IN AN EQUIPMENT

connection. The portion of such information which is common to a majority of the connec­tions may be included in a general note; see 15-10.3.10. Wire gage, color or code should be included in the tabulation when this information is needed to facilitate connection and main­tenance; see Figures 10-21 and 10-25(A).

(c) PATH, ROUTING, VIA Information. In­formation concerning wire path, raceways, cable routes, hole locations, etc., should be included in the tabu lation when such information is not shown elsewhere and its indication is essential to the proper wiring of the equipment. As an alternative to showing path or route information in the tabulation, it may be shown instead in the supplementary equipment diagram accompanying the tabulated information.

(d) NOTES, FUNCTION, or REMARKS. Wire run requirements such as sleeving data, wire terminals, special jumpers, and functional lead designations applicable from one point of con­nection to the other may be included.

15-10.6.2 Tabulation Sequence The sequence selected for listing entries

in a table should be compatible with the applica-

60

tion of the information and the type of equipment involved. This application will determine the sequence selection on the basis of whether the information is to be used mainly for manufacture, installation or maintenance or any combination of these. The type of equipment structure (chassis, panel, cabinet, bay or frame) and the manner in which component devices or parts are arranged are also factors in the sequencing. The type of equipment will usually determine the method of item designation (identification) used, it may be reference, locational or functional. Tabulation sequence and the listing method used shall be spec ified on the diagram.

15-10.6.2.1 Listing Methods Connections between component devices

or parts may be listed in a sequence based on one or more of the following considerations:

(a) Component device or part location in or on equipment chassis, panel, bay, frame, etc. (Conveyance of this location will depend upon the system of designation used; reference, 10-cational, or functional.) A listing sequence of entries in the table based on a top-down and left­to-right scan of the wiring side of the equipment is preferred from a wiring performance stand-

~ .,'

0\ ....

')

PANEL WIRE TABLE

WIRE CONN OROER PANEL A

NO 14 REO G Ol,TB I Ol,TB 3 TR.TB 5 ICR. 2CR.2FU, TR 6 ICR,2CR 7 2CR.TR 8 ICR. TR 10 ICR. 2CR. 2FU.Ol

PANEL B

NO.14 REO G ICT.3CT HI IFU. TRANS H2 IFU, TRANS L11 IFU. LSW-FU L12 IFU. lSW-FU 3 M.A 5 M,A

INTER PANEL WIRE TABLE

NO. 14 REO CI Ol,ICT C3 Ol,3CT G TB,ICT XI 2FU, TRANS X2 2FU. TRANS 2 TB.M 3 TB.A 4 TR.A 5 TR,A 6 2CR,A 8 TRIM 9 2CR,A

ALL POWER WIRING TO BE 3/0 BLACK TYPE TW

START

STOP

"

PANEL A

lOW VOLTAGE PANEL

I ICR

I I ~ i i l lIlt 8

__ PANEL B

~o-2c:FROINT V'"-~Ir -_-____ ~-_- '!~A9 f ~ i : : .J .J "I I

LSW­FU ~

\U.I TR

2FU

:Jrl~n II -_ 1'121~tl ~

~~ 10 5

cp I 2

PB ~3 ~~ : L~~

-- I I -2 -

6

(tl) OL

,~~, I I

~

~ TI T2 T3

o AC

POWER 2

L13 Ll2 LII

C3

G 3CT

CI

G leT

I

1~~LJi : ~2 © : ~-_~ __ J

IFU

~~ TRANS

: T T31 T T21 L:r I 26

• I : : f: (fil : I ~--___ --.J ~

FIGURE 10·23 - TYPICAL CONNECTION DIAGRAM-WITH TABULATION FOR THOSE CONNECTIONS NOT SHOWN DIAGRAMMATICALL Y

'~

tt1 t'"4 tt1 n t-i

~ > t'"4 > Z o tt1 t'"4 tt1 n t-i

~ Q 52 > c;') :::a > ~

PROPOSED USA STANDARD DRAFTING PRACTICES

DIAGRAMMATIC FORM TABULAR FORM

T!

y REV WIRE FROM TO :Ii: z C!) -' Ia.I

...J 5 ::ig ~ c( COLOR SYMBOL METHOD TERMINAL NOTES Ia.I

>- ~ > TERMINAL > NOTES V) a: OR PATH ~-' Ia.I Ia.I ~ Z ...J -'

- y 20 GRO I 1(1 : 10 I

- +CR6 PGT K1 h Kl I 15

I I I- CR6+ PGT Kl l5 Kl P ~ y 20 Kl : 10 GRO I

- - _ .... I '- -- .---

(A) PIGTAIL PART POLARITY OR ORIENTATION (TWO WAY RUN.S)

- -I- R1 PGT WTl WTl ~ R1 PGT WT2 WTl I- BR 20 WT2 WTIt ~ ~2 PGT WT3 WTIt

BR I- BR 20 WTIt WTl I- Rl PGT WTIt WT3

i

PGT I- (B) PIGTAIL PARTS WITH NONCOLORED AXIAL LEADS (TWO WAY RUNS)

TBI -W I

~

- - -- I -- W PGT TB1 : 1 Tl

- BK PGT TBI :1 Tl I

BK ! ......

0 ~ ! -

- " PGT TBI 13 Tl I - W PGT Tl I TBI I I

8K PGT Tl I TBI I 2

I - " PGT Tl I TB1 3 "-- - -

(C) PIGTAIL PARTS WITH COLORED LEADS (TWO WAY RUNS)

FIGURE 10-24 - PIGTAIL COMPONENT ENTRIES IN A TYPICAL TABULAR LISTING

point. This method results in each wire being listed twice, once in each direction.

(b) Wiring techniques of the same type, such as wires in cable harness, direct or surface wiring, or leads of pigtail parts, etc.

(c) Wire description, such as color, gage, material, length, etc.

(d) Wires (leads) carrying similar signals, potentials, etc.

15-10.6.3 Placement of Lists Lists may be shown as follows: (a) On the same drawing sheet showing a

layout of the equipment as illustrated in Figure 10-23.

(b) On separate sheets as shown in Figure 10-25(A). When the separate sheet practice is used, the equipment layout information may be shown on another drawing or the information may be made part of the tabular list multisheet draw­ing.

62

15-10.6.4 Terminalldentification If items are identified in the table with

reference designations, terminals may be iden­tified with numbers or letters separated from the designation by a dash or space as shown in Figures 10-21 and 10-25(A). When the designa­tion is given in terms of its function or location, it is preferable to provide a separate column for terminal identification.

15-10.6.5 Pigtail Parts Pigtail part information (when listed) shall

be entered in the tabular list as follows: (a) Surface-Mounted Parts with Colored Pig­

tails. Colors of color pigtail wires shall be en­tered in a wire description column; see Figure 10-24(A).

(b) Lead-Mounted (axial lead) Parts wi th Noncolored Pigtails. The reference designations of lead-mounted parts, such as R1, C6, or CR3, shall be entered in a wire description column;

-

REV

=1 ~

~

~

~

~

~

~

~

~

~

I-

~

l-

~

l-

I-

~

~

~

I-

---~

I-

~

~

--I-

~

--l-l-

i-I--

ELECTRICAL AND ELECTRONICS DIAGRAMS

WIRE FROM TO

COLOR I SYJI80L METHOD ~ I~ TERMINAL iii

NOTES ~ TERMINAL OR PATH ~

~-a

"SI

~ ~-R-Y lit-II

~ Ie It ., ~ iN-I ~-G B II

~-BL V

BK ., SK BK BK It-V

R-G C8M

CB" CIM

.-w ~8" BR R2

112 STRAP V N

M-R

-

c Z -I

STl CA2 TBI 12 Al 18 I 1 CAl '81 12 '81 11 1 1

5Tl CA2 '81 13 Al IA

5n CA2 '81 14 AI C I

PI CA2 TIl 15 MI NEG PI CA2 'Bl 16 M.l PBS

T81 I

T2 PG' 11 I

PG' T81 IS T2

CAl TBI !9 A2 6 I ,

CAl TBI 110 A2 :2 5S4 CAl Tl It XVI 11 , I

CAl Tl 12 A2 18

SPI CAl Tl 13 PI fA. SPI CAl Tl 14 PI Ic

• , CA2 T1 IS XVI :8

PG' T2 I TBI h I I • PGT T2 I TBI

18

HI DIR VI ICAP JI I I I

SUR WTl • A2 :4S I CAl WTl I PI 'es I

5S3 CAl XVI Ii A2 7 I

5S4 CAl XVI II Tl I CAl XVI 11$ XVI 1$

I CAl XVI 11$ XVI 1$

CAl XVI !u XVI 2S 1

SS2 CAl XVI 12 R3 2 CAl XVI !21 XVI 1$

CAl XVi h A2 3 I

PG' XVI 14 XVI 7

XVI 15 , XVI 16

PG' XVI h XVI 4 1

XVI :7 XVI 18

CA2 XVI t71STl Al IE STl CA2 Al IA TBI b

I TBl

I STl CA2 Al 18 12

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Continued on page 64

(A) TABULAR CONNECTION DIAGRAM (EQUIVALENT TO BASE-LINE CONNECTION DIAGRAM FIGURE 10-25 (B»

FIGURE 10-25

63

I~ NOTES ....

PROPOSED USA STANDARD DRAFTING PRACTICES

Continued from page 63

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I iii SYMBOL

1&1 >- c COlOR ~ TERMINAL > NOTES TERMINAL i:i NOTES II) ~ OAPATH 1&1 z ... ... - "-R-V STl CAZ A1 :C TBI ; ,,, - 8K CAZ Al les Al 10 , , - 8K CAZ A1 10 A1 ItS

- v CA2 Al Ie XV1 11(STl , , - G CAl AZ 11 PI /8 - w-a CAl A2 Iz T81 110

- BR CAl AZ 13 P1 'A I

- BR CAl A2 13 XVI • 3

- RF SUR AZ I" J2 I - BK SUR AZ 14S WTl

- eL tAl A2 Is fBI 1

- V CAl A2 1 16 1

T91 9

- R-V SSl CAl A2 17 XVI I

- e CAl A2 Is Tl 2 , - BK HI DU Jl 1 VI tAP

- RF SUR J2 t A2 I" I , , - BK-W PI CA2 M1 INEG T91 15

- W PI CA2 ~l Ipas TBI '6

- BR tAl PI IA , A2 3

- R SP1 CAl PI IAe Tl 3

- G tAl PI Is A2 1 I

- R-W SSl tAl PI lB- R3 I

- R-Bl SPI tAl PI Ie Tl " I - BK tAl PI Its WTl

- R-W SSI CAl R3 II PI B-I

R3 - ca" CAl R3 II' 2S I

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- Jll,Sl CAl TBI 'I T9l rs - v CA2 XV1 le n Iloo.- :-- -- -

NOTES $ DENOTES TERMINATION OF SHIELD MS DENOTES MECHANICAL STRAP AND IS PREFIXED BY THE DESIG·

SS DENOTES SHIELDED SINGLE NATION OF THE TERMINAL TO WHICH THE SHIELDED WIRE CONNECTS. SP DENOTES SHIELDED PAIR

COM DENOTES TERMINATION OF A SHIELD ST DENOTES SHIELDED TRIPLE COMMONED WITH A SECOND SHIELD • DENOTES LOWER CASE LETTER BY A SINGLE TERMINATION.

FIGURE 10.25 - COMPARISON OF TABULAR AND PICTORIAL FORMS OF CONNECTION DIAGRAM FOR THE SAME ASSEMBLY

64

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ELECTRICAL AND ELLCTRONICS DIAGRAMS

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65

PROPOSED USA STANDARD DRAFTING PRACTICES

see Figure 10-24(B). The terminals to which the ends of the part connect shall be listed in the FROM and TO columns.

15-10.6.5.1 Polarity or Orientation of Axial-Lead Parts

When it is necessary to indicate polarity or orientation based on marks such as + or - that appear on the part, an appropriate symbol shall be used; see Figure 10-24(C). When such sym­bols are used, an explanatory note shall be in­cluded.

15-10.6.6 Supplementary Data Tabular lists that appear on separate sheets

as multisheet drawings should be supplemented with equipment layout information showing the following:

(a) Relative location of all portions of units that have to be wired within or on the equipment. If all the portions are not shown in detail in the layout, reference to drawings containing the de­tailed information should be indicated.

(b) Terminal arrangement and identification of unmarked terminals of items. The data should show a wiring side view of the terminal arrange­ment. A recommended sequence assignment of terminal identification is a left-to-right and top­to-bottom order.

(c) Special wiring arrangements shown pic­torially which cannot be conveyed with tabular information alone.

(d) Paths of cable harnesses when such paths are not readily determined. For typical illustrations showing general equipment layout information, see Figure 10-22.

1 )·11 Interconnection Diagrams (In Process)

15-12 Terminal Diagrams The following subparagraphs contain in­

formation specifically applicable to diagrams of the type often supplied for multi-terminal en­closed or sealed devices, such as electron tubes, semiconductor devices, packaged circuits and similar items. For typical Terminal Diagrams, see Figures 12-1 and 12-4.

The function of a Terminal Diagram may also be performed by a Pictorial Diagram showing:

(a) the physical relations of the terminals to the device outline, and

(b) the terminal designations assigned or marked together with a table or a Schematic Dia­gram relating the circuit or device parts to the terminal designations.

15-12.1 Circuit Representation The circuit of the item depicted shall be

represented using graphic symbols in the usual mali(ler. An envelope symbol or an enclosing

66

circle shall be shown if applicable; in all other cases the mechanical-grouping boundary line shall be used to outline the circuit.

Circuits composed of more than one component part shall have the individual parts identified, preferably by reference designations. Component part values shall be indicated and be placed either adjacent to the part symbols or in a separate tabulation. Circuits composed of many intercon­nected component parts are preferably shown by a Schematic Diagram (see Figures 8-23 and 12-4), accompanied by an Assembly Drawing showing the necessary physical relationships and term­inal designations.

15-12.2 Terminal Representation and A"ange-ment .

The terminals of the items shall be represented using the applicable graphic symbols located ad­jacent to the envelope or boundary line and ar­ranged as follows:

(a) The terminals shall be located in the order they appear when the item is viewed from outside the terminal face of the device.

(b) If the device terminals are in a circular arrangement, the actual angular spacing between the terminals should be approximated on the Terminal Diagram.

(c) If the terminals are in an essentially linear arrangement, the Terminal Diagram may show the terminals in either a linear array along one side of the elongated envelope symbol (pref­erable), or within a maximum angle of 150 de­grees around the circular envelope symbol.

(d) If terminals are omitted in an otherwise standard terminal array, the remaining terminals shall not be respaced.

ELECTRICAL AND ELECTRONICS DIAGRAMS

o Connect the terminals to the circuit inside the outline; see Figures 12-1 through 12-4.

15-12.3 Orientation Features Symmetrical terminal configurations usually

have an orientation reference in the form of: (a) a locating guide or mechanical index, a

physical feature to prevent incorrect insertion ,of the device in its mounting (key, bayonet pm, terminal omission in symmetrical pattern, etc.), or

(b) a reference mark or visual index positively located with respect to the terminal group, or

(c) terminal markings. Orientation symbols shall be indicated at their proper location on the Terminal Diagram; see Figures 12-2(E) and 12-3.

15-12.4 Terminal Arrangement Designations Devices having a base or terminal arrangement

conforming to an established mechanical design standard shall have the standard designation for the tenninal arrangement shown adjacent to the Terminal Diagram; see Figure 12-1. However, on diagrams intended for other than engineering or design purposes, mechanical design standard designations may be omitted.

15-12.5 Terminal Identification If terminal identifications have been assigned,

they shall be shown on the Terminal Diagram at the assigned positions.

New terminal configurations should have their terminal identifications assigned as follows:

(a) Terminals or contact pins should be iden­tified by numbers.

(b) Terminals should be designated in suc­cession, based on the maximum possible number of terminals. If terminals are omitted, the re­maining terminals shall not be renumbered; see Figure 12-1(B).

(c) For circular configurations, or elsewhere if applicable, terminal numbering shall begin with the first terminal, the center of which is past (in a clockwise direction) the datum line (15-12.5.1) as viewed from outside the terminal face of the device. If omission of a terminal in an otherwise equally spaced array identifies the datum line, the position of the omitted terminal shall not be numbered.

67

(d) For terminals in an essentially equally spaced linear array, the terminal positions shall be numbered progressively beginning with the terminal nearest the reference mark and counting any intermediate positions which could provide space for a terminal; see Figure 12-3.

(e) Terminals in one linear array shall be num­bered progressively from the left side, where the left side is defined as having the most terminals. This shall be employed only if (d) is not applica­ble.

(f) If a device has several standard terminal groups, the terminal identifications may be es­tablished independently for each group.

(g) If a terminal configuration has terminals in concentric circles of decreasing diameters, the terminal positions on the circles shall be numbered sequentially continuing from the high­est numbered position on the outer circle, al­way s numbering in ~ clockwise direction along a decreasing spiral. The datum line is the refer­ence used for the outer pin circle only.

(h) In the case of devices with terminals emerging from more than one plane the numbering shall start on the end:

(1) Opposite to the end containing a threaded stud or hole. (2) Opposite to the end with the smallest number of terminals. (3) Opposite to the end identified by a band, dot, or other applied visual identifica­tion. (4) Opposite to the end with the larger ferrule, flange, insert, etc.

(i) A terminal at the center of the terminal arrangement shall be identified as the CENTER terminal lead or pin, and shall not be given a terminal number.

(j) Whenever polarity of a device is to be indicated, a polarity symbol + or - should be used.

15-12.5.1 Terminal Group Datum Lines The datum line is a radial line used as a

starting point for numbering tenninals in a cir­cularly arranged array.

A datum shall be chosen in the following order of preference. If two cases apply, the method appearing first in the list shall be used.

(a) The radial line from the center of the terminal group through the center of the key, key­way, or index.

(b) The radial line midway between the two terminals which obviously comprise a gap in an otherwi se equally spaced circular terminal array.

(c) The radial line midway between: (1) The two large contact tenninals (2) The two small contact tenninals

(d) The radial line 1800 from the locating radius of the most isolated terminals.

PROPOSED USA STANDARD DRAFTING PRACTICES

RS 209 GRI AND Cl-2

(A) DEVICE WITH a-TERMINAL KEYED (SUCH AS OCTAL) BASE, RIGID ENVELOPE TERMINAL, AND METALLIC ENVELOPE CONNECTED TO BASE TERMINAL

RS 209 GRI

(B) DEVICE WITH KEYED (SUCH AS OPTICAL) BASE HAVING DESIGN CAPABILITY OF B PINS BUT WITH 2 PINS OMITTED, AND WITH 3 RIGID ENVELOPE TERMINALS

RS209 E9-1

(C) DEVICE WITH 9-TERMINAL (SUCH AS NOVAL) BASE UTILIZING GAP IN PIN SPACING TO ESTABLISH BASE ORIENTATION

FIGURE 12.1 - TYPICAL ELECTRON TUBE BASING OR TERMINAL DIAGRAMS

(A)

(B)

JEDECI2 00-9

TWO-TERMINAL DEVICE WITH ONE FLEXIBLE LEAD AND ONE RIGID TERMINAL CONNECTED TO METALLIC ENVELOPE

TWO-TERMINAL DEVICE WITH RIGID TERMINALS AND REFERENCE POINT LOCATED AT ONE OF THE TERMINALS

(C) THREE-TERMINAL DEVICE WITH CIRCULAR ARRANGEMENT OF PIN TERMINALS WITH BASE ORIENTATION DETERMINED BY GAP IN PIN SPACING

(D) THREE-TERMINAL DEVICE WITH RIGID TERMINALS, ON CONNECTED TO THE METALLIC ENCLOSURE, AND INDEX PIN

OR A ~

(E) FOUR-TERMINAL DEVICE WITH IN-LINE PIN TERMINALS, ONE CONNECTED TO METALLIC ENVELOPE, AND REFERENCE POINT

FIGURE 12·2 - TYPICAL SEMICONDUCTOR DEVICE OR TERMINAL DIAGRAMS

68

r ELECTRICAL AND ELECTRONICS DIAGRAMS

FIVE-TERMINAL DEVICE WITH IN-LINE TERMINAL LEADS, ONE CONNECTED TO METALLIC ENCLOSURE. AND REFERENCE POINT

FIGURE 12-3 - TYPICAL RELAY TERMINAL DIAGRAM

(e) The radial line 1800 from the locating radius of the bayonet pin.

(£) The radial line 1800 from the mid point: (1) Of the two most cksely spaced term­inals. (2) Of the two most widely spaced terminals.

(g) The radial line from the center of the terminal ~roup through the center of the index

•

RI

C2 R3

C3 R4

I ltI -+_R_

2

--t __ t--

C

_

4

--t_

2 4 5

CIRCUIT WITH LEAD TERMINALS, TERMINAL IDENTIFICATION MARKED ON ITEM, PART VALUES LISTED IN SEPARATE TABLE

6

FIGURE 12-4 - TYPICAL PACKAGED CIRCUIT TERMINAL DIAGRAM

terminal. In order of preference the index term­inal is defined as:

69

(1) The terminal having the smaller cross­sectional area at the point of emergence from the case. (2) The terminal having the greatest axial length •

USA Standards of Particular Interest to Designers, Architects and Draftsmen

TITLE OF STANDARD

USA Standard Drafting Practices Section 1 Size and Format Section 2 Line Conventions, Sectioning and Lettering Section 3 Projections . Section 4 Pictorial Drawing . Section 5 Dimensioning and Notes . Section 6 Screw Threads • Section Section Section Section Section Section Section Section

7 Gears, Splines and Serrations . 8 Castings . 9 Forgings .

10 Metal Stampings 11 Plastics • 12 Die Castings 13 Springs, Helical and Flat 14 Mechanical Assemblies

Section 15 Electrical and Electronics Diagrams • Section 16 Tools, Dies and Gages Section 17 Fluid Power Diagrams Section 18 Drawings for Optical Parts .

YI4.1-1957 YI4.2-1957 YI4.3-1957 YI4.4-1957 YI4.5-1966 YI4.6-1957 YI4.7-1958

· In Preparation YI4.9-1958

· YI4.10-1959 YI4.11-1958

• In Preparation · In Preparation · YI4.14-1961 · YI4.15-1966 · In Preparation

Section 19 Engineering Drawings for Photographic Reproduction

YI4.17-1966 • In Preparation · In Preparation

Graphical Symbols for: Metallizing Symbols Welding Plumbing Pipe Fittings, Valves and Piping . Heating, Ventilating and Air Conditioning . Use on Railroad Maps and Profiles Heat-Power Apparatus Fluid Power Diagrams Process Flow Diagrams in Petroleum and Chemical Industries Nondestructive Testing Symbols Abbreviations for Use on Drawings

Letter Symbols for: Hydraulics Rocket Propulsion Mechanics for Solid Bodies Structural Analysis Heat and Thermodynamics Physics . Aeronautical Sciences Radio. Meteorology . Acoustics Chemical Engineering Petroleum Reservoir Engineering and Electric Logging. Abbreviations for Scientific and Engineering Terms . Guide for Selecting Greek Letters Used as Letter Symbols

for Engineering Mathematics She 11 Theory

Y32.12-1960 Y32.3-1959 Y32.4-1955

Z32.2.3-1949 (Reaffirmed 1953) · Z32.2.4-1949

Y32.7-1957 Z32.2.6-1950 (Reaffirmed 1956)

Y32.10-1958 Y32.11-1961

· Y32.17-1962 Z32.13-1950

YI0.2-1958 YIO.14-1959 ZlO.3-1948 ZlO.8-1949 YI0.4-1957 ZI0.6-1948 YI0.7-1954 YI0.9-1953

YI0.10-1953 . YI0.11-1953 (Reaffi;med 1959) . YI0.12-19SS (Reaffirmed 1961)

YI0.15-1958 ZI0.1-1941

YI0.17-1961 YI0.16-1964