basic electrical material and methods part 1 … conformed... · basic electrical material and...

Regional Connector Transit Corridor Project

ISSUED: 03/14/14

BASIC ELECTRICAL MATERIAL AND METHODS Metro C0980 26 05 10 - 1

SECTION 26 05 10

BASIC ELECTRICAL MATERIAL AND METHODS

PART 1 - GENERAL

1.1 DESCRIPTION

The Work specified in this Section consists of designing, furnishing and installing basic electrical materials and equipment.

1.2 QUALITY CONTROL

A. Comply with Section 01 43 10, Project Quality Program Requirements – Design/Build.

B. Seismic Restraints - Equipment and installation of electrical materials as indicated; conform to California Building Code, seismic zone 4 requirements.

C. Provide equipment and material certification compliance data to Metro.

1.3 REFERENCE STANDARDS

A. American National Standards Institute (ANSI)

ANSI B31.1 Power Piping ANSI C80.1 Rigid Steel Conduit - Zinc Coated

B. American Society for Testing and Materials (ASTM)

ASTM A123 Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A153 Zinc Coating (Hot-Dip) on Iron and Steel Hardware ASTM D149 Dielectric Breakdown Voltage and Dielectric Strength

of Solid Electrical Insulating Materials at Commercial Power Frequencies

ASTM D570 Water Absorption of Plastics ASTM D638 Tensile Properties of Plastics ASTM D695 Compressive Properties of Rigid Plastics ASTM D790 Flexural Properties of Unreinforced and Reinforced

Plastics and Electrical Insulating Materials ASTM D1000 Pressure-Sensitive Adhesive Coated Tapes Used for

Electrical Insulation ASTM D1693 Environmental Stress-Cracking of Ethylene Plastics ASTM D2240 Rubber Property - Durometer Hardness ASTM D4325 Nonmetallic Semi-Conducting and Electrically

Insulating Rubber Tapes ASTM D4388 Nonmetallic Semi-Conducting and Electrically

Insulating Rubber Tapes

amanda.mendoza

Stamp


ISSUED: 03/14/14


C. American Welding Society (AWS)

AWS D1.1 Structural Welding Code-Steel

D. California Code of Regulations (CCR)

CCR Title 24 Part 3, California Electrical Code (CEC) CCR Title 24 Part 2, California Building Code (CBC)

E. Institute of Electrical and Electronics Engineers (IEEE)

IEEE C37.35 Application, Installation, Operation, and Maintenance of High-Voltage Air Disconnecting and Load Interrupter Switches

F. National Electrical Manufacturers Association (NEMA)

(All electrical equipment shall be manufactured in accordance with industry standard NEMA equipment Standards.)

G. National Fire Protection Association (NFPA)

NFPA 70 National Electrical Code NFPA 130 Standard for the Design of Fixed Guideway Transit

Systems H. Underwriters Laboratories Inc. (UL)

(All equipment shall be UL listed for its intended installation and purpose in accordance with industry standards.)

1.4 SUBMITTALS

Refer to Section 01 33 00, Submittals, for submittal procedures. Identify product data by equipment numbers and submit structural and seismic calculations as required. Operations and maintenance data as specified in Section 01 78 23, Operation and Maintenance Data. A. Product Data: Submit manufacturer product data sheets for electrical equipment.

B. Shop Drawings: Submit manufacturer shop drawings and calculations for electrical equipment installation.

C. Test Reports: Submit equipment factory test reports and field test reports.

D. Embedded conduit installation plans: Submit embedded conduit installation plans.

E. Maintenance and Operations Data: Submit maintenance and operations data in Section 01 78 23, Maintenance and Operations Data.

F. Test Procedures: Submit test procedures in accordance with Section 26 08 00,

Commissioning of Electrical Systems.

amanda.mendoza

Stamp


ISSUED: 03/14/14


PART 2 - PRODUCTS

2.1 GENERAL REQUIREMENTS

A. Furnish items of material, design, of minimum size and rating as indicated on the drawings.

B. All ancillary area electrical equipment enclosures shall be NEMA 12 type, industrial standard grey color, except electrical equipment in emergency fan rooms which shall be NEMA 4X type and shall be plenum rated, unless otherwise noted.

C. All station public area, tunnel, crosspassage, sump pump structure, and other tunnel rooms electrical equipment enclosures shall be NEMA 4X type and standard industrial grey color, unless otherwise noted.

2.2 GALVANIZED RIGID STEEL (GRS) CONDUIT AND ACCESSORIES

A. Conduit, Couplings, Elbows, Bends, Sealing Fittings and Nipples - ANSI C80.1 and UL 6, with each length bearing manufacturer's stamp and UL label.

B. PVC Coated Conduit - Conduit - NEMA RN 1, Coating Type A-40.

2.3 ELECTRICAL METALLIC TUBING (EMT)

EMT Conduit NOT Permitted.

2.4 LIQUID-TIGHT FLEXIBLE METALLIC CONDUIT AND FITTINGS

A. Conduit - Consisting of core of flexible galvanized steel with extruded liquid-tight neoprene jacket overall. Jacket - Moisture- and oil-proof, capable of minimum radius bends of flexible conduit without cracking.

B. Fittings - UL 514B, malleable iron or galvanized steel, cadmium- or zinc-coated.

2.5 PVC ELECTRICAL CONDUIT AND FITTINGS

Embedded portions of electrical and communication conduits shall be a minimum of one inch in diameter, PVC Schedule 40 type conduits, unless otherwise indicated. Embedded PVC Schedule 80 type conduits shall be used at structural foundations.

2.6 CONDUIT EXPANSION FITTINGS

A. Fabricate from material similar to type conduit with which used.

B. Include factory installed packing ring and pressure ring; prevent entrance of moisture.

C. Include grounding ring or grounding conductor for metallic expansion couplings.

2.7 PHENOLIC CONDUIT, BOXES, ENCLOSURES AND ACCESSORIES

amanda.mendoza

Stamp


ISSUED: 03/14/14


A. Phenolic conduit, fittings, elbows, conduit bodies, adhesives, boxes, enclosures and mounting hardware compliant with NFPA 130 material and wiring requirements, and ASTM E136 non-combustible material requirements.

B. Listed as part of an assembly to meet UL 2196 listing requirements, where required to meet NEC and NFPA 130 requirements.

2.8 MULTIPLE PIPE HANGERS (TRAPEZE TYPE)

A. Fabricate two or more steel hanger rods, a steel horizontal member and U-bolts, clamps and other attachments necessary for securing hanger rods, cable trays and conduits.

B. Hanger Rod - Not smaller than 3/8 inch diameter, threaded full length or sufficient distance at each end to permit minimum 1 1/2 inches of adjustment.

C. Horizontal Member

1. Standard structural steel shapes, angles and channels: 1 1/2 by 1 1/2 or 1 5/8 by 1 5/8 inches, 12 gauge, cold-formed, lipped channel; designed to accept special spring-held hardened steel nuts for securing hanger rods and other attachments.

2. Two or more channels may be welded together to form horizontal members of greater strength.

3. Galvanize after fabrication in accordance with ASTM A153.

D. Design - Comply with requirements for seismic restraint.

1. Support load including to sum of weights of conduits and wires, and weight of hanger, plus 200 pounds.

2. Stress at root of thread of hanger rods - Not more than 9475 psi at design load.

3. Size horizontal member to limit maximum stress of not more than 12,650 psi at design load.

2.9 CONCRETE CHANNEL INSERTS

A. Channel Inserts

1. Fabricate from cold-formed steel channels 12 gauge or thicker Galvanize after fabrication in accordance with ASTM A153.

2. For Embedding in Concrete

a. Fabricate from channels having a solid base.

b. Weld concrete anchors to channel during fabrication and before coating.

amanda.mendoza

Stamp


ISSUED: 03/14/14


c. Clean and galvanize after fabrication.

d. Provide assemblies with minimum pull-out load rating of 4500 pounds per linear foot uniformly distributed. Furnish channel inserts for embedded installation in concrete with channel interior completely filled with styrofoam.

e. Furnish channel inserts for embedded installation in concrete with channel interior completely filled with styrofoam.

3. For Surface Mounting

a. Fabricate from channel with 3/8 inch by three inch slots on four inch centers in base.

b. Galvanize inserts for surface mounting on concrete surfaces, and for installation in damp or wet areas in accordance with ASTM A153.

c. Use galvanized expansion shield type anchor bolts.

B. Spot Inserts for Embedding in Concrete

1. Steel, galvanized after fabrication in accordance with ASTM A153.

2. Design for maximum loading of 800 pounds with safety factor of three.

3. Knockout openings - Accommodate square or rectangular nuts.

2.10 SURFACE METAL RACEWAYS AND FITTINGS

Conform to UL5 and NFPA 70.

2.11 OUTLET, JUNCTION AND PULL BOXES

A. Conform to NFPA 70 Article 314.

B. Electrical boxes - Conform to UL 50 and UL 514B.

C. Provide electrical boxes of material, finish, type and size indicated and required for location, kind of service, number of wires, and function. Provide exterior mounting ears for electrical boxes used in tunnels and cross passages (NEMA 4).

D. Provide boxes complete with accessible covers designed for quick removal and suitable for purpose used; equip boxes, in which or on which no devices or fixtures are to be installed, with flat or raised blank covers as required. Ceiling fixture outlet boxes - Equip with 3/8 inch boltless fixture studs.

E. Junction and pull boxes less than 100 cubic inches in size - Cast metal for exposed installation pressed steel for embedded installation. Boxes more than 100 cubic inches in size -Conform to requirements for cabinets, Section 26 09 16 Cabinets, except use sheet metal boxes with gasketed covers in tunnels; interface pull boxes at ends of tunnels.

amanda.mendoza

Stamp


ISSUED: 03/14/14


F. Covers - Same thickness as pressed steel boxes; secured in position by No. 10-24 stainless steel machine screws. Arrange covers to be readily and conveniently removed. Cover for four inch square box - Provide opening at one side for switch or receptacle; blank at other side.

G. Concealed and embedded junction boxes - Zinc-coated inside and out. Outlet boxes used as junction boxes - Not smaller than four inches square by 1 1/2 inches deep. Provide flat blank covers.

H. Lighting Outlet Boxes

1. Exposed installation - Cast metal, not smaller than four inches round or square by 2 1/8 inches deep.

2. Embedded and concealed installation - Pressed steel boxes approved for intended purpose.

I. Concealed or embedded switch or receptacle boxes - Pressed steel, four inches by 2 1/8 inches by 2 1/8 inches deep minimum size. Use cast metal boxes for exposed installations.

J. Cast metal boxes - Steel or ferrous alloy, with compatible conduit fittings.

K. Boxes for exposed switches and receptacles - Cast metal, FS and FD Types.

L. Furnish necessary adapter plate for mounting devices on light fixtures, brackets, supports, hangers, fittings, bonding jumpers and other accessories required.

M. Provide neoprene gaskets 1/8 inch thick for boxes subjected to weather. Provide fire resistant gaskets 1/8 inch thick for boxes in tunnels and cross passages. Provide boxes in tunnel and cross passages having external mounting ears.

N. Grounding - Provide each box with a grounding terminal.

1. Grounding terminal - Green-colored washer-in-head machine screw not smaller than No. 10-32 in a drilled and tapped hole in back of box, or a grounding bushing with green-colored machine screw terminal attached to one conduit.

2. Provide suitable grounding terminals in motor connection boxes.

3. Install grounding jumpers as specified in Section 26 05 26, Grounding and Bonding For Electrical Systems.

2.12 CONNECTORS AND INSULATING TAPES

A. Splice and Terminal Connectors

1. Provide termination fittings for use with cable furnished, NEMA standard and UL 486 listed.

2. Termination and splice fittings for No. 10 and smaller conductors - Screw-on,

amanda.mendoza

Stamp


ISSUED: 03/14/14


spring-pressure type copper connectors with nonflammable, self-extinguishing insulation of temperature rating equal to that of cable being connected. Terminals - Provide metal insulation grip on conductor for strain relief.

3. Termination and splice fittings for No. 8 and larger conductors - Tool-applied compression connectors of material and design compatible with conductors, for which used.

4. Terminal connectors for conductors size No. 4/0 and larger - Long-barrel, double compression type, with two NEMA standard bolting holes in pad.

5. Provide heat-shrinkable insulator for compression type connectors and splices inside motor box.

B. Insulating Material for Splices and Terminations

1. Type - Approved by Metro for particular use, location and voltage, 3/4 inch nominal width.

2. Plastic electrical insulating tape for general use - Pliable at minus 18⁰C to 105⁰C. When tested in accordance with ASTM D4325 and ASTM D4388, meet following:

a. Thickness: Seven mils.

b. Breaking strength: 15 pounds per inch.

c. Elongation: 200 percent.

d. Dielectric strength: 1250 volts/mil.

e. Insulation resistance (direct method of electrolytic corrosion): 10 megohms.

3. Rubber electrical insulating tape for protective over-wrapping - Silicone rubber with silicone pressure-sensitive adhesive. When tested in accordance with ASTM D1000, meet following:

a. Elongation: 525 percent.

b. Dielectric strength: 875 volts.

c. Insulation resistance (indirect method of electrolytic corrosion): 10 megohms.

4. Mark tape packages to indicate shelf-life expiration date.

2.13 WIRING DEVICES

A. Wiring devices include switches, receptacles and special outlets installed in raceway and conduit boxes, complete with cover plates.

B. Switches

amanda.mendoza

Stamp


ISSUED: 03/14/14


1. AC tumbler-toggle switches - Specification grade, heavy duty type meeting minimum requirements of UL 20, and specified.

2. Provide switches that operate in any position and are fully enclosed with entire body and cover of molded phenolic, urea or melamine. Do not use fiber, paper or similar insulating material for body and cover.

3. Equip switches with metal mounting yoke with plaster ears, insulated from mechanism and fastened to switch body using bolts, screws, rivets or other substantial means to meet test requirements.

4. Provide green-colored equipment grounding screw on yoke.

5. Section of yoke normally intended to bear on surface outside box - Minimum overall dimension of 3/4 inch, measured at right angles to longitudinal axis of yoke.

6. Switch contacts - Between silver or silver alloys.

7. Switches - Back or side wired with terminals of screw or combination screw-clamp type.

8. Terminal screws - No. 8 or larger, captive or terminal type.

9. Provide access holes for back wiring.

10. Wiring terminals: Receive and hold proper wire sizes as shown below:

SWITCH RATING WIRE SIZE, AWG NO. 20 amperes 10 and/or 12 30 amperes 8

11. Wall switches: Tumbler type, totally enclosed, heavy-duty, in accordance with NEMA WD 1, color as selected by Metro.

12. Switches for use on incandescent and fluorescent lighting circuits: Fully rated 20 or 30 amperes at 120 or 277 volts, as indicated.

13. Switches controlling straight resistance loads: Snap switches as specified, of proper rating up to 30 amperes at 120/277 volts.

14. Snap Switches: Provide ac 120/277 volt snap switches capable of withstanding tests outlined in NEMA WD 1.

15. Time clock: Solid state electronic programmable astronomical time switch suitable for indoor use.

C. Receptacles And Plugs

1. Configuration and requirements for connector and outlet receptacles - UL 498

amanda.mendoza

Stamp


ISSUED: 03/14/14


and NEMA WD 1 for heavy-duty general use type.

2. Receptacle bodies and bases - Fire-resistant non-absorptive hot molded phenolic composition material or approved equivalent with metal plaster ears integral with supporting member.

3. Type - Flush type, unless otherwise indicated.

a. Wall receptacles - Single or duplex as indicated, specification grade, 120 Vac, 60 Hz, 20 ampere.

b. Provide receptacles and plug caps with light colored terminal facilities for neutral connections, amber or brass colored for phase conductor connections and green colored hexagonal machine screws for equipment grounding conductor and connections.

c. Receptacle contacts including grounding contact - Double grip bronze type with spring steel backup clips to ensure both sides of each male prong of plug will be in firm contact.

d. Provide receptacles with self-grounding clip or mounting strap screws.

e. Ground fault circuit interrupter duplex receptacles: 120 volt, 60 Hz, 20 ampere with built-in test, reset buttons, and ground fault tripped indication. Interrupt circuit within 1/30 second on a five milliampere earth leakage current. Designed for end of run installation or with provisions for feeding through to protect other outlets on circuit. Maximum circuit capacity 20 amperes. Furnish receptacles with necessary wire connectors, clips, mounting screws and instructions. In public areas, tunnels, elevator machine rooms and top and bottom escalator pits, provide ground fault circuit interrupter type duplex receptacles.

D. Cover Plates

1. Provide cover plates for switches, receptacles and special purpose outlets. Conform to UL 514A.

2. Use multi-gang plates for multi-gang boxes.

3. Covers

a. Non-public concealed or embedded installations - Stainless steel.

b. Exposed installations - Cast metal, compatible with boxes.

c. Public areas - Stainless steel, with No. 4 finish.

d. Commercially produced special-purpose outlets using special material, configuration and size - Brushed stainless steel designed for particular application.

amanda.mendoza

Stamp


ISSUED: 03/14/14


4. Commercial plates of specified material and finish not available for special-purpose outlets - Commercially available plates suitable for enameling to match adjacent surface.

5. Flush devices - Stainless steel, 0.040 inch thickness.

2.14 DISCONNECTING DEVICES

A. Safety-Switch Type Disconnecting Devices - Enclosed, conforming to IEEE C37.35.

B. Heavy-duty Safety Switches (600 Vac) - Meet NEMA KS1 requirements.

1. Furnish heavy-duty safety switches of electrical characteristics, ratings and accessories as indicated.

2. Furnish switches with NEMA 12 industrial-duty enclosures, metal nameplates, front cover mounted, containing a permanent record of switch type, catalog number and hp ratings.

3. Furnish handle with visible blades, reinforced fuse clips; nonteasible, positive, quick-make quick-break mechanism, and pad-lockable in OFF and ON positions.

C. Fuses - UL approved, current-limiting type, 200,000A interrupting capacity, dual-element, time-delay for motor and circuit protection.

2.15 INDIVIDUAL CONTROL RELAYS

A. Provide convertible contacts rated a minimum of 10 amperes, 600 volts. Verify coil voltage, and number and type of contacts. Furnish in NEMA 1 enclosures. Relay specifications - As specified in Section 26 09 16, Controls, Instrumentation, Control Panels and Interface Cabinets.

B. Following are suggested manufacturers, or approved equivalent.

MANUFACTURER TYPE Allen-Bradley Bul. 700, Type BX Cutler-Hammer Bul. 9575 General Electric Class CR2811 Westinghouse Bul. 16-321, Type NH Potter Brumfield Series KRP

2.16 PULL CORDS

Nylon, minimum 240 pounds tensile strength.

2.17 COMMUNICATION RACEWAY LINERS

A. Material - High density polyethylene, PE-3409, with following physical properties:

1. Flammability, UL 94 - V.0.

amanda.mendoza

Stamp


ISSUED: 03/14/14


2. Tensile strength, ASTM D638: 2000 psi, minimum.

3. Stress cracking,ASTM D1693: 1000 hours, minimum.

B. Minimum Liner Dimensions:

1. Inside diameter - One inch.

2. Outside diameter: 1.4 inches.

3. Pull load: 575 pounds.

4. Bend radius: 10 inches.

2.18 MANDRELS

Solid cylinder type for conduits three inches in diameter installed with large bend radius. High-strength aluminum alloy with steel center rod and cast iron eyes. Outside diameter of mandrel - Not smaller than 1/4 inch less than inside diameter of conduit to be mandrelled. Mandrel length - Not less than six inches. For smaller conduits or conduits with sharp bends, use flexible mandrel or shorter length mandrel (ball-shaped mandrel similar to Ensley "Go No Go" mandrel).

2.19 DRY TYPE TRANSFORMERS

A. Two-winding, Copper, Class H, with full capacity taps on high voltage winding per NEMA ST 20. Auto-transformer type is not acceptable. 30 kVA units and less: 85° C insulation with 115°C temperature rise. Transformers larger than 30 kVA: 220°C insulation with 150°C rise.

B. Noise Levels: Do not exceed following values when measured in accordance with NEMA ST 20:

1 To 9 kVA 40 dBA 10 To 50 kVA 45 dBA 51 To 150 Kva 50 dBA

C. Housing and Finish: Nema 4X. Thoroughly clean, degrease, and prime metallic surfaces with zinc primer; finish with industrial grey enamel.

D. Nameplate: Provide 2½ inch-wide laminated plastic, attached to each transformer by means of stainless steel rivets or permanent adhesive; show transformer number engraved with ½ inch incised white letters on black background as indicated.

2.20 CABLEWAYS FOR TUNNELS

A. CABLEWAY - Metal raceway to house and protect electrical, copper and fiber-optic cables from damage.

amanda.mendoza

Stamp


ISSUED: 03/14/14


1. Cableway - Channel shaped body with one shelf as indicated, and hinged cover

with captive latches. One end of cableway unit - Include open (in front) bell end or attached coupler to permit end-to-end assembly. Design components that when installed, electric cables and fiber-optic cables may be laid in. Cableway system - Includes straight Sections of standard lengths, horizontal bends, vertical bends, transition Sections and other fittings as detailed, expansion joints, and other components as specified.

2. Non-standard lengths for installation may be field-constructed by cutting standard length units. If shortened standard length impairs function of cableway and cover, use two shortened lengths.

B. CABLEWAY SYSTEM AND SUPPORT REQUIREMENTS

1. Loading - Maximum dead-load of 12 pounds per linear foot for each compartment of cableway.

2. Material - Steel, as indicated, in accordance with following:

a. Cableway body and cover - ASTM A570, Grade 30

b. Cableway plates, stiffeners, supports, angles - ASTM A36.

3. Finishing - Finishing steel components, including supports and connections with hot-dip galvanized coating after fabrication and welding; meet requirements of ASTM A123, ASTM A384 and ASTM A385.

a. Galvanize after drilling holes and before riveting.

b. Cableway bodies, transitions and fittings, including barriers - finish surfaces free of sharp edges, burrs, blisters, lumps, globules, heavy deposits of zinc, bare spots, flaking and projections that can damage cable jackets and insulation.

c. Supports - Finish free of roughness and significant imperfections including bare spots, lumps, blisters and inclusion of flux, ash and dross.

d. Cut edges in cableway system - Free of sharp edges; paint with approved asphaltum or other corrosion-resistant paint.

4. Fitting Radius: 24 inches minimum.

5. Fitting Bends: 90 degrees, or as indicated or required. 6. Bottom - Solid, flat with 5/16 inch minimum bending radius, drain holes as

indicated; single-stage dimpling punched from inside out.

7. Hardware - ASTM A276, Type 430 stainless steel for blind fasteners, Type 316 for other hardware, unless otherwise indicated. Design hardware so installation

amanda.mendoza

Stamp


ISSUED: 03/14/14


will not abrade nor destroy effectiveness of galvanized coating.

8. Nominal standard length of cableway body and cover - Eight feet and 10 feet as indicated.

9. Electrical Continuity at Connections - Resistance not more than 0.00033 Ohms.

10. Holes and Drain Holes - Single-stage, dimple-punched from interior of cableway body out, and before galvanizing.

11. Compartment Identification Labels - Identify each compartment of each cableway Section, transition and fitting using vinyl, pressure-sensitive decals with black letters on yellow background. Letters: 1 1/2 inch inches high by one inch wide.

12. Fabrication - Comply with NEMA VE-1, UL-5, and AWS D9.1.

2.21 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS

A. Support Channel: Steel, Galvanized, Enameled or other corrosion resistant.

B. Hardware: Corrosion resistant.

C. Minimum sized threaded rod for supports shall be 3/8” for trapezes and single conduits 1-1/4” and larger, and ¼” for single conduits 1” and smaller.

D. Conduit clamps, straps, supports, etc., shall be steel or malleable iron. One-hole straps shall be heavy duty type. All straps shall have steel or malleable backing plates when rigid steel conduit is installed on the interior or exterior surface of any exterior building wall.

E. Life safety system branch circuit support hardware located in tunnels, station public areas and emergency ventilation plenums compliant with NFPA 130 rating and ASTM E136 non-combustible material requirements.

2.22 CABLE TRAYS

Provide ladder type cable trays complying with the following standards and requirements: A. NEMA VE 1, Class 8C

B. Material: Steel.

C. Finish: ASTM A 123, hot dipped galvanized after fabrication.

D. Standard Widths: Main cable tray runs 36 inches. Minor extension runs 24 inches.

E. Inside Depth: 4 inches.

F. Straight Section Rung Spacing: 6 inches on center.

G. Inside Radius of Fittings: 24 or 36 inches as required.

H. Provide manufacturer's standard clamps, hangers, brackets, splice plates, reducer

amanda.mendoza

Stamp


ISSUED: 03/14/14


plates, blind ends, barrier strips, connectors, and grounding straps.

2.23 UNDERGROUND ELECTRICAL DISTRIBUTION SYSTEM AND STRUCTURES

Provide site underground conduit, maintenance holes, pull boxes, precast concrete structures and all required installation materials for as described below. A. Conduit: Conform to ASTM D2750 for ABS, ASTM F512 for PVC.

B. Bell ends: Provide flared bell ends on conduit and ducts entering manholes, pull

boxes, and electrical vaults.

C. Precast Concrete Structures: Refer to Section 03 41 00 Precast Structural Concrete.

D. Pull boxes: Precast reinforced concrete boxes, extensions, bases and covers. Mark covers low voltage and provide with two lifting eyes and two hold down bolts. Provide suitable opening for ground rod.

E. Maintenance holes: Where required by utilities, locations identified on plans or where

required for a maintainable underground installation provide maintenance holes complying with the following requirements:

1. Use monolithically constructed precast concrete maintenance holes in lieu of

monolithic cast-in-place reinforced concrete maintenance holes. Meet strength requirements of DWPPS Standards.

2. Frames and covers: Grey cast iron. Provide machine-finished seat to ensure matching joint between cover and frame.

3. Provide opening in floor for ground rod and drain.

2.24 VIBRATION AND ISOLATION RESTRAINING DEVICES

A. Vibration Isolator Types 1. General Properties

a. Vibration isolators - Undeflected heights or calibration markings so that, after

adjustment when carrying load, deflection under load can be verified; determine load is within proper range of device and correct degree of vibration isolation is provided to design.

b. Isolators - Operate in linear portion of load versus deflection curve. Load versus deflection curves - Furnished by manufacturer; linear over deflection range of not less than 50 percent above design deflection.

c. Ratio of lateral to vertical stiffness - Not less than 0.9 nor greater than 1.5.

d. Theoretical vertical natural frequency for each support point, based upon load per isolator and isolator stiffness - Do not differ from design objectives for

amanda.mendoza

Stamp


ISSUED: 03/14/14


equipment by more than +/- 10 percent.

e. Reduce wave motion through isolator to following extent: Isolation above primary vertical system resonance frequency - Follow theoretically predicted isolation curve for single degree of freedom systems with 10 percent up to 50 db or greater at frequencies above 150 Hz.

f. Neoprene mountings - Shore hardness of 40-65 after minimum aging of 20 days, or corresponding open-aging.

2. Isolator Description

a. Type MS - Spring type, without housings or snubbers, equipped with leveling bolts and with two layers of ribbed or waffled neoprene pad separated by a 1/16 inch galvanized steel plate under base plate. Install neoprene sleeves and washer anchor bolts.

b. Type HS - Suspension hangers with steel frame and spring element, in series with a neoprene pad, cup, or washer. Isolator - Designed so hanger rod may be disaligned 15 degrees in any direction relative to vertical, without contacting hanger box frame.

c. Type MN - Neoprene isolator support type unit having minimum static deflection of 1/4 inch.

d. Type HN - Suspension hanger type employing a neoprene isolator unit with minimum static deflection of 1/4 inch.

B. Equipment Frames

1. Provide mounting frames and brackets to carry load of equipment, without causing mechanical distortion or stress to equipment.

2. Mounting frames - Welded, wide flange or channel structural steel, with welded brackets to accept isolators. Section depth of frame members - Not less than 1/10 length of longest frame member, and not less than 1/10 of greatest span between support points. Frame members - Same depth.

C. Restraints

1. Two inches by 1/4 inch flat iron bars with resilient pads to provide vertical and lateral restraint during seismic shock.

2. Two pieces of flat iron bars bolted together with two 3/8 inch bolts and serrated washers. Holes in bars - Slotted vertically to permit adjustment for proper clearance.

2.25 IDENTIFICATION OF ELECTRICAL SYSTEMS

A. Submittals:

amanda.mendoza

Stamp


ISSUED: 03/14/14


1. Product Data: For each electrical identification product indicated.

2. Samples: For each type of label and sign to illustrate size, colors, lettering style, mounting provisions, and graphic features of identification products.

3. Identification Schedule: An index of nomenclature of electrical equipment and system components used in identification signs and labels. The submitted Identification system shall follow Metro’s standards.

4. Coordination:

a. Coordinate identification names, abbreviations, colors, and other features with requirements in other Sections requiring identification applications, Drawings, Shop Drawings, manufacturer's wiring diagrams, and the Operation and Maintenance Manual; and with those required by codes, standards, and 29 CFR 1910.145. Use consistent designations throughout Project.

b. Coordinate installation of identifying devices with completion of covering and painting of surfaces where devices are to be applied.

c. Coordinate installation of identifying devices with location of access panels

and doors.

d. Install identifying devices before installing acoustical ceilings and similar concealment.

B. Power Raceway Identification Materials

1. Comply with ANSI A13.1 for minimum size of letters for legend and for minimum

length of color field for each raceway size.

2. Colors for Raceways Carrying Circuits at 600 V or Less: Black letters on an orange field.

3. Legend: Indicate voltage and system or service type.

4. Self-Adhesive Vinyl Labels for Raceways Carrying Circuits at 600 V or Less: Preprinted, flexible label laminated with a clear, weather- and chemical-resistant coating and matching wraparound adhesive tape for securing ends of legend label.

5. Metal Tags: Brass or aluminum, 2 by 2 by 0.05 inch, with stamped legend, punched for use with self-locking cable tie fastener.

6. Write-On Tags: Polyester tag, 0.010 inch thick, with corrosion-resistant grommet and cable tie for attachment to conductor or cable.

7. Marker for Tags: Permanent, waterproof, black ink marker recommended by tag manufacturer.

amanda.mendoza

Stamp


ISSUED: 03/14/14


C. Armored and Metal-Clad Cable Identification Materials 1. Comply with ANSI A13.1 for minimum size of letters for legend and for minimum

length of color field for each raceway and cable size.

2. Colors for Raceways Carrying Circuits at 600 V and Less: Black letters on an orange field.

3. Legend: Indicate voltage and system or service type.

4. Self-Adhesive Vinyl Labels: Preprinted, flexible label laminated with a clear, weather- and chemical-resistant coating and matching wraparound adhesive tape for securing ends of legend label.

D. Power and Control Cable Identification Materials 1. Comply with ANSI A13.1 for minimum size of letters for legend and for minimum

length of color field for each raceway and cable size.

2. Self-Adhesive Vinyl Labels: Preprinted, flexible label laminated with a clear, weather- and chemical-resistant coating and matching wraparound adhesive tape for securing ends of legend label.

E. Conductor Identification Materials 1. Color-Coding Conductor Tape: Colored, self-adhesive vinyl tape not less than 3

mils thick by 1 to 2 inches wide.

2. Write-On Tags: Polyester tag, 0.010 inch thick, with corrosion-resistant grommet and cable tie for attachment to conductor or cable.

F. Equipment Identification Labels 1. Adhesive Film Label: Machine printed, in black, by thermal transfer or equivalent

process. Minimum letter height shall be 3/8 inch.

2. Adhesive Film Label with Clear Protective Overlay: Machine printed, in black, by thermal transfer or equivalent process. Minimum letter height shall be 3/8 inch. Overlay shall provide a weatherproof and UV-resistant seal for label.

3. Self-Adhesive, Engraved, Laminated Acrylic or Melamine Label: Adhesive backed, with white letters on a dark-gray background. Minimum letter height shall be 3/8 inch.

4. Engraved, Laminated Acrylic or Melamine Label: Punched or drilled for screw mounting. White letters on a dark-gray background. Minimum letter height shall be 3/8 inch.

5. Stenciled Legend: In nonfading, waterproof, black ink or paint. Minimum letter height shall be 1 inch.

amanda.mendoza

Stamp


ISSUED: 03/14/14


G. Miscellaneous Identification Products 1. Paint: Comply with requirements in Division 09 painting Sections for paint

materials and application requirements. Select paint system applicable for surface material and location (exterior or interior).

2. Fasteners for Labels and Signs: Self-tapping, stainless-steel screws or stainless-steel machine screws with nuts and flat and lock washers.

2.26 MOTORS

A. General

1. Conform with NEMA MG1, squirrel cage induction type unless otherwise indicated.

2. Rating:

a. Horsepower (hp) - As required. b. Voltage and Frequency. c. Less than 1/2 hp: 115 volt, single-phase, 60 Hz supply. d. 1/2 hp and above: 460 volt, three-phase, 60 Hz supply unless otherwise

indicated. e. Speed and Number of Poles - As indicated. f. Time Rating - Continuous unless otherwise indicated. g. Operation - Suitable for operation at variation of frequency and voltage of +/-

10 percent of rating without damage except when variable frequency drives are used.

B. Design Letters

1. Single-Phase Motors - Design N, suitable for full voltage across-the-line starting.

2. Three-Phase Motors - Design B unless otherwise required:

a. Up to and including 50 hp motors - Suitable for full voltage across-the-line starting.

b. Above 50 hp motors - Suitable for reduced voltage starting unless otherwise required.

C. Service Factor

1. Up to and including one hp motor - NEMA MG1, Section 12.51 Table 12-4.

2. 1 1/2 hp and up to and including 200 hp motors: 1.15.

3. Above 200 hp motors: 1.15.

D. Insulation

amanda.mendoza

Stamp


ISSUED: 03/14/14


Provide class B for operation in an ambient temperature of 40°C. Epoxy encapsulated except for fractional horsepower motors, hermetically sealed and semi-hermetically sealed compressor motors.

E. Noise Level

Provide transformers with minimum noise ratings per NEMA MG 1 requirements, do not exceed the requirements of CAL/OSHA when measured in accordance with IEEE 85.

F. Energy Consumption

Design motor winding as energy saver with full load current 15 percent less than standard design motor.

G. Enclosure

Provide enclosures according to their installed locations in compliance with Metro design criteria, and the following minimum requirements: 1. Drip-proof fully-guarded or totally-enclosed.

2. Heavy duty steel or cast iron frame with cast iron end brackets.

3. Mounting: Foot-mounted on pad or adjustable pad as required or otherwise indicated.

4. Grounding: Provision for grounding.

5. Finish: Red oxide zinc chromate primer with finish with industrial gray enamel.

6. Drain: Provide drain plug for condensate drainage.

7. Enclosures: Provide enclosures for motors installed in hazardous areas, of the group and class of motors, approved for type of hazard in which the transformer is located.

H. Conduit Box

Cast iron diagonally split type, suitably gasketed, size suitable to accommodate motor leads as required in NEMA MG 1. Rotatable in any of four 90 degree positions.

I. Bearings

Provide motors with bears with a 15 year average life, but not less than three years at continuous operation, with double shields. For 5 hp motors and below provide sealed ball or roller bearings unless otherwise indicated. For 5 hp up to 350 hp motors provide ball or roller bearings with grease fittings and minimum pressure relief fittings for in-service lubrication.

amanda.mendoza

Stamp


ISSUED: 03/14/14


J. Compressor and Vertical Pump Motors

Provide motors for hermetically Sealed and Semi-hermetically Sealled Compressors where required compliant with NEMA MG 1, Sections 18.076 through 18.093.

K. Motors for Close-Coupled Pumps

Provide motors for close-coupled pumps where required compliant with ASTM A582, Type 303 stainless steel shaft.

PART 3 - EXECUTION

3.1 GENERAL

A. Install items in locations indicated, rigid and secure, plumb and level, and in alignment with related and adjoining Work to make complete workable system. Do not weld electrical conduits and enclosures to supports. Bolt, screw or clamp to hold and fasten firmly in place. Installation - Designed for easy removal and future replacement.

B. Furnish anchor bolts and anchorage items as required; field check to ensure proper alignment and location. Provide templates, layout drawings, and supervision at Worksite to ensure correct placement of anchorage items in concrete. Check embedded items for correct location and detail before concrete is placed.

C. Install supporting members, fastenings, framing, hangers, bracing, brackets, straps, bolts and angles as required to set and rigidly connect Work; conform to CBC seismic requirements.

D. Control erection tolerance requirements; do not impair strength, safety, serviceability or appearance of installations. Determine exact locations of conduit. Route conduit parallel to building lines unless otherwise indicated.

E. Trade size, type and general routing and location of conduits, raceways and boxes - As indicated or specified.

F. Install exposed conduit to avoid conflicts with other work. Install horizontal raceways close to ceiling or ceiling beams, and above water and other piping wherever practicable.

G. Install individual conductors and multiple-conductor sheathed cables in conduits, raceways, cable trays, ducts and trenches as indicated to complete wiring systems.

H. Install switches, receptacles, special-purpose outlets and cover plates complete in neat manner, in accordance with NFPA 70 and CEC. Plug unused openings in boxes, cabinets and equipment.

3.2 CONDUIT AND FITTINGS

amanda.mendoza

Stamp


ISSUED: 03/14/14


A. Metallic and Nonmetallic Electrical Conduit

1. Install conduit in accordance with NFPA 70 and CEC and as indicated. Prevent concrete and other materials from entering and obstructing conduit, outlets, and pull and junction boxes. Do not use conduit smaller than 3/4 inch for exposed Work and one inch minimum for embedded Work.

2. Unless otherwise indicated, make conduit bends in accordance with NFPA 70 and CEC, with not more than three 90 degrees bends, 270 degrees total, per run of conduit for traction power and four 90 degrees bends, 360 degrees total, otherwise. Where more bends are required in a particular run, install pull boxes as required to facilitate pulling conductors. Communication conduits type "CT" in ductbanks or embedded in base slab - Make gradual bends with no more than 180 degrees totals.

3. Metallic conduit installed for future extension - Terminate with couplings flush to finished floor level or wall, unless otherwise indicated. Provide threaded plug for open end. Extensions to existing Work - Match existing size.

4. Provide stainless steel metallic numbering tags indicating conduit number on end of conduit. Identify train control and communication conduit; provide plug for open end.

5. Properly support and anchor conduit to be embedded; maintain correct location and spacing and prevent flotation during concreting operations.

6. When exposed or buried conduit passes through expansion or contraction joint in structure, install conduit at right angles to joint; provide approved conduit expansion fitting at joint. Paint conduit with approved bituminous compound for one foot on each side of expansion couplings.

7. Provide expansion fittings in conduit runs as required to compensate for thermal expansion.

8. Conduit embedded in concrete - Space three times diameter of larger conduits and embed at or near center of slab or wall. Rigidly support embedded conduits with rebars attached to structural rebars at center of slab; prevent sag during and after pouring of concrete.

9. Pull mandrel and swab through embedded conduit after installation to remove foreign matter. Draw mandrel through completed conduit run manually without mechanical assistance. After conduits are cleaned and mandrelled, install rope, cover boxes, and securely seal both ends of conduit with caps as indicated. If obstructions are encountered which cannot be removed, or if conditions exist which may result in damage to wires and cables pulled through conduit, install new conduit. Have Metro witness mandrelling of conduits for which cables will be installed by others.

10. Conduit exposed to different temperatures - Seal to prevent condensation and passage of air from one area to the other.

amanda.mendoza

Stamp


ISSUED: 03/14/14


11. GRS conduits - Electrically and mechanically continuous; connect to ground by bonding to grounding system.

12. Apply conductive compound to threads of threaded rigid conduit joints. Do not use compounds containing lead. Terminate conduit in appropriate boxes at motors, switches, outlets and junction points.

13. When field cutting of conduit is required, thread and ream conduit to remove rough edges. Where conduit enters box or other fitting, provide bushing to protect wire from abrasion. Provide insulation type bushings and double locknuts on ends of rigid conduits terminating at steel boxes, panelboards, cabinets, motor starting equipment and similar enclosures. Smooth rough surfaces and restore galvanized coating.

14. Support individual horizontal conduits not larger than 1 1/2 inches diameter with one-hole conduit straps with back spacers or individual conduit hangers.

15. Conduits installed against concrete surfaces - Space away from surface by clamp backs or other acceptable means.

16. Support individual horizontal conduits larger than 1 1/2 inches diameter by individual hangers and forged steel conduit strap for vertical runs.

17. For dry locations, spring steel fasteners, clips or clamps specifically designed for supporting exposed single conduits may be used instead of conduit straps or hangers. All underground electrical installations shall be considered wet locations for compliance with code requirements.

18. Hanger rods used in connection with spring steel fasteners, clips and clamps: 1/2 inch diameter galvanized steel rods or, if concealed above suspended ceiling, galvanized perforated steel strapping. Do not use wire for support of conduit.

19. Support parallel conduits at same elevation on multiple conduit hangers or channel inserts. Secure each conduit to pipe hanger or channel insert member by U-bolt, one-hole strap or other specially designed and approved fastener suitable for use with pipe hangers or channel inserts.

20. Space supports not over 10 feet on centers for vertical conduits spanning open areas. Securely anchor conduit at each end; do not interfere with installation and operation of equipment at location.

21. Conduits and raceways above suspended ceilings - Support from floor construction above or from main ceiling support members; use applicable methods as specified.

22. Install liquid-tight flexible metal conduit at structural construction joints, at motor connections and where required so liquids run off surface and do not drain toward fittings. Provide sufficient slack to reduce effects of vibration. Running threads are not acceptable. Where necessary for connecting conduits, use right-hand and left-hand couplings.

amanda.mendoza

Stamp


ISSUED: 03/14/14


23. Provide stainless steel metallic tags indicating numbers and total angle of bends in conduits embedded in concrete.

24. In areas of floating slabs, install horizontal runs of conduit beneath floating slab. Do not pass conduit through floating slab unless conduit is required to terminate in a vertical direction. Provide 1/4 inch clearance between floating slab and vertical conduit riser. Fill space around conduit with rubber-base waterproofing compound.

25. Tag unscheduled conduit in manner approved by Metro.

B. Nonmetallic Electrical Conduit

1. Cap or plug ends of embedded conduit with permanent cap or plug; prevent concrete and other materials from obstructing conduit. Do not use duct tape to temporarily seal conduit before concrete placement.

2. Sandpaper joints in PVC conduit; remove burrs, clean and dry joints, and brush with solvent cement recommended by manufacturer.

3. Support conduit to maintain correct location and spacing during concreting operations; provide suitable plastic supports and spacers for conduit ductbanks.

4. Nonmetallic electrical conduit stubbed up to be connected to metallic conduit - Use embedded metallic coupling flush with floor or wall.

5. Other installation requirements - As specified for metallic electrical conduit.

6. Notify Metro for inspection and sign-off at conduits to be embedded in concrete before issuing concrete pouring permit.

C. Pull Cords

1. Do not splice pull cords.

2. Leave ample slack length at each end of pull cords.

D. Filling Openings - Where slots, sleeves and other openings are provided in floors and walls for passage of raceways, including bus ducts, fill openings as follows:

1. Use fire-resistive filling material for openings similar to material of floor, wall or ceiling being penetrated; finish to prevent passage of water, smoke and fumes.

2. Where conduits passing through openings are exposed in finished rooms, use filling material that matches, and is flush with, adjoining finished floor, ceiling or wall.

E. Embedded Conduit inside - Mandrel and swab embedded conduits. Remove foreign matter that may damage cable insulation. Draw mandrel through each completed conduit run by hand without mechanical assistance. After conduits are cleaned and

amanda.mendoza

Stamp


ISSUED: 03/14/14


mandrelled, install rope, cover boxes, and securely seal both ends of the conduit with caps as indicated. Where obstructions cannot be removed, or condition exists which may result in damage to cable installation, notify Metro, remove obstructed conduit, and install new conduit as directed by Metro.

3.3 EMBEDDED INSERTS

A. Channel Inserts - Install embedded channel inserts with slotted face flush with finished concrete surface.

B. Spot Inserts - Install with insert face flush with finished concrete surface, firmly embedded, with no evidence of movement.

C. Test five selected inserts, as required by Metro; suspend 800 pound weight from insert. If there is evidence of failure, replace inserts.

3.4 SURFACE METAL RACEWAYS

A. Securely ground surface metal raceways to outlet boxes or to backplates and fixtures by means of bolts, screws or other acceptable methods and as specified in Section 26 05 26, Grounding and Bonding.

B. Install surface metal raceways where indicated, in accordance with NFPA 70 and CEC. Use fittings and accessories designed for raceway.

3.5 OUTLET, JUNCTION AND PULL BOXES

A. Outlet Boxes

1. Unless otherwise indicated, flush-mount outlet boxes with front edges of boxes, or attached tile covers flush with finished wall or ceiling.

2. Mount boxes with long axis of devices vertical unless otherwise indicated.

3. Locate boxes and box knockouts without interference with reinforcing steel.

4. Unless otherwise specified, provide for tile covers boxes in tile walls and ceilings. Do not install covers until finished tile line is determined for particular location.

5. Mounting height indicated for wall-mounted outlet box - Height from finished floor to horizontal centerline of cover plate.

6. Mount outlet boxes for switches and receptacles located on columns and pilasters to prevent interference with installation of partitions.

7. Card reader boxes located near doors - Install on lock side, even where symbols appear on hinge side, unless other locations are approved by Metro.

B. Junction and Pull Boxes

1. Install covers readily accessible after completion of installation.

amanda.mendoza

Stamp


ISSUED: 03/14/14


2. Do not install boxes above suspended ceilings, except where ceiling is removable type or where definite provisions are made for access to each box.

C. Boxes Set in Concrete

1. Support boxes to prevent movement during placement of concrete.

2. Plug and mask unused nailing holes and other holes in side or bottom of boxes. Unplugged or uncovered holes - Not permitted.

3. After installation, clean boxes placed in concrete.

3.6 WIRING

A. General

1. Provide wiring complete as indicated. Provide ample slack wire for motor loops, service connections and extensions. In outlet and junction boxes provided for installation of equipment by others, coil and tape ends of wires and install blank covers.

2. Measure insulation resistance of wiring system before connecting to terminal blocks, motors, switchgear, motor control centers, transformers, panelboards and cabinets. Applied potential: 500 volts DC for control wiring, and 1000 volts DC for power cables for one minute. Insulation resistance - Minimum two megohms for control cables and 10 megaohms for power cables.

3. Do not bend cables to radii less than 12 times outside diameters, except where conditions make specified radius impracticable and shorter radii are permitted by NFPA 70 and NEMA WC 7, Appendix N.

4. Neatly and securely bundle cable conductors located in branch circuit panelboards, cabinets, control boards, switchgear, motor control centers and pull boxes. Use nylon bundling straps.

5. Continuity test.

B. Cable Supports - Install cable supports for vertical feeders in accordance with NFPA 70 and CEC.

C. Splices and Terminations

1. Make wire and cable splices only in outlet, junction and pull boxes, or in equipment cabinets. Splices in conduit or raceway will not be permitted. Make splices with compression type connectors and cover with tape to insulation level equal to that of cable.

2. Use positive type connector installation tools as recommended by manufacturer.

3. Mechanical hand tools, with dies for each conductor size as recommended by

amanda.mendoza

Stamp


ISSUED: 03/14/14


manufacturer, may be used on conductor sizes through No. 6.

4. For conductor sizes larger than No. 6, use hydraulic tools with hexagonal or circumferential installing dies for each conductor size, as recommended by manufacturer.

5. Clearly mark die numbers on installed connectors.

3.7 WIRING DEVICES

A. Locate switches and general-purpose duplex receptacles 48 inches above finished floor, unless otherwise indicated.

B. Rigidly attach receptacles to outlet box with at least two screws.

C. Exterior and tunnel locations - Mount receptacles in watertight cast type outlet boxes with threaded hubs or bosses and equip with gasketed cover and captive cap of screw or twist type.

D. Provide equipment permanently connected to exterior receptacles, and in areas subject to spray or hose cleaning, with watertight male plugs to suit. Receptacles - Ground-fault-circuit-interrupter type, as specified.

E. Furnish matching plug with each power receptacle installed in Work as indicated.

3.8 COMMUNICATION RACEWAY LINERS

A. Install liner in following raceways with diameter three inches and larger:

1. Conduit.

2. Trenches.

3. Ducts.

4. Banks.

5. Troughs.

B. Provide minimum three innerduct liners for each raceway three inches in diameter. Increase number by one for each one inch increase in diameter, e.g. six inches diameter conduit = six innerduct.

3.9 WELD INSPECTION

A. Visual Inspection - All welds per AWS D1.1 or ANSI B31.1 as applicable.

B. Magnetic Particle Inspection: 10 percent of welds per AWS D1.1 ANSI B31.1 as applicable.

C. Ultrasonic Inspection: 10 percent of full penetration welds and 3/8 inch thickness per

amanda.mendoza

Stamp


ISSUED: 03/14/14


AWS D1.1 or ANSI B31.1, as applicable.

D. If failure occurs in first 10 percent sample, select second 10 percent sample and test. If no failure occurs in second 10 percent sample, all represented welds shall be acceptable; rework failed sample in initial 10 percent sample. If failure occurs in second 10 percent sample, welds shall be 100-percent tested.

3.10 DRY TYPE TRANSFORMERS

A. Install dry-type transformers in accordance with NFPA 70 and NEMA criteria and as recommended by manufacturer. Conform to CBC requirements for Seismic Zone 4 location and as specified in Section 26 05 10, Basic Electrical Materials and Methods. All transformers 45kVA or less shall be wall mounted as shown in typical electrical installation drawing details.

B. Grounding: Ground transformers as identified in Section 26 05 26, Grounding and Bonding for Electrical Systems

C. Field Tests: Perform field testing of installed transformers to verify circuits are

properly connected in accordance with manufacturer installation wiring diagrams, are continuous and free from short circuits, and to verify insulation resistance to ground of non-grounded conductors is megger tested to not less than 10 megohms.

D. Commissioning of Electrical System: Perform testing of installed transformers as part

of the electrical system. Comply with the testing requirements of Section 26 08 00, Commissioning of Electrical Systems.

3.11 CABLEWAYS FOR TUNNELS

A. Install cableway under tunnel walkway overhang.

B. Attach to back wall with stainless steel bolts into inserts. Provide washers and other attachment accessories as recommended by manufacturer.

C. Assembly of Adjacent Sections – Install cableways with a minimum gap of less than

1/4 inch between cableways.

D. Concrete Steps and Crosswalk Areas - Install cableways through concrete steps and crosswalks. Provide boxes, elbows, and extensions as required.

E. Crosspassage Area – Install and extend cableways through openings at back of

cableway at crosspassages to crosspassage cable trenches with removable covers to crosspassage communication interface cabinets.

F. End of Tunnel Area - Install and terminate with one box as indicated. Use box - for

transition of cables from cableway system to station through conduits.

3.12 HANGERS AND SUPPORTS FOR ELECTRICAL SYSTEMS

A. Fasten hanger rods, conduit clamps, outlet, junction and pull boxes to building

amanda.mendoza

Stamp


ISSUED: 03/14/14


structure using pre-cast insert system, preset inserts, beam clamps, expansion anchors, or spring steel clips (interior metal stud walls only).

B. Use toggle bolts or hollow wall fasteners in hollow masonry, plaster, or gypsum board partitions and walls; expansion anchors or preset inserts in solid masonry walls; self-drilling anchors or expansion anchors on concrete surfaces; sheet metal screws in sheet metal studs and wood screws in wood construction. If nail-in anchors are used, they must be removable type anchors.

C. File and de-bur cut ends of support channel and spray paint with cold galvanized

paint to prevent rusting.

D. Do not fasten supports to piping, ductwork, mechanical equipment, cable tray or conduit. Do not fasten to suspended ceiling grid system.

E. Do not drill structural steel members unless approved by Metro.

F. Fabricate supports from galvanized structural steel or steel channel, rigidly welded or

bolted to present a neat appearance. Use hexagon head bolts with spring lock washers under all nuts.

G. In wet locations, mechanical rooms and electrical rooms install free-standing

electrical equipment on 3.5 inch (89 mm) concrete pads.

H. Install surface-mounted cabinets and panelboards with minimum of four anchors. Provide steel channel supports to stand cabinet one inch (25 mm) off wall (7/8” Uni-strut or ¾” painted, fire-retardant plywood is acceptable).

I. Bridge studs top and bottom with channels to support flush-mounted cabinets and

panelboards in stud walls.

J. Furnish and install all supports as required to fasten all electrical components required for the project, including free standing supports required for those items remotely mounted from the building structure, catwalks, walkways etc.

3.13 CABLE TRAYS

A. Provide standard length cable trays in TC&C Rooms, Auxiliary Power Substation room, Auxiliary Power Rooms and Traction Power Substation Rooms, Medium Voltage Switchgear rooms and Entrance Electrical rooms to support cables and conduits within and between these rooms as identified.

B. Provide dedicated cable trays for medium voltage (34.5kV and 750V DC traction power) cables within traction power substations, medium voltage switchgear rooms, and auxiliary power substation rooms. Install 34.5kV cables in embedded GRS conduit (concrete painted red) located outside these rooms. Optional surface ceiling mounted 34.5kV cables installed in GRS conduit in auxiliary power substation room only. Install 750V cables in either surface mounted GRS conduit or embedded GRS conduit outside of traction power substation rooms.

amanda.mendoza

Stamp


ISSUED: 03/14/14


C. Provide dedicated cable trays in TC&C rooms, Auxiliary Power Substation rooms. Auxiliary Power rooms, Traction Power Substation rooms and Entrance Electrical room to route low voltage (<600 Volts) branch circuiting and power distribution feeders (rated: 480V/3P, 277V/1P, 208V/3P, 208V/2P or 120V/1P) in GRS conduit.

D. Provide dedicated cable trays in TC&C Rooms, Auxiliary Power Rooms and Traction

Power Rooms to route power limited control and communication cables within the room.

E. Provide three level cable trays, as shown in typical installation details, to route

medium voltage, low voltage and control cables within Auxiliary Power Substation rooms, Traction Power Substation rooms, and Medium Voltage Switchgear rooms.

F. Provide two level cable trays, as shown in typical installation details, to route low

voltage branch circuiting in GRS conduits and control cables in Auxiliary Power Rooms and other electrical rooms with motor control centers, and TC&C rooms.

G. Install in metallic cable tray in accordance with NEMA VE 1 and manufacturer's

instructions.

H. The Contractor shall coordinate the installation of the cable tray with plumbing and HVAC Contractors so that clearance is maintained between the cable tray and other trades work. This clearance shall be minimum of one (1) foot on both sides of the cable tray and eight (8) inches on top of the cable tray.

I. Provide continuity between tray components.

J. Bond cable tray to the telecommunication grounding bar or conductor in each

equipment room (#4 AWG minimum).

K. Equipment grounding conductor connections to the tray shall be made using a U.L. listed mechanical connection.

L. All single and multi-conductor cables shall be fastened to the tray at intervals not to

exceed four feet (4').

M. Conduit connections to the tray shall be made with an U.L. approved clamp, manufactured specifically for the purpose.

N. Where cable tray is to penetrate a fire rated wall or floor, the entire assembly must

be UL approved and meet fire code requirements.

3.14 UNDERGROUND ELECTRICAL DISTRIBUTION SYSTEM AND STRUCTURES

A. General

1. Provide underground electrical distribution systems including duct (conduit) banks, pull boxes and maintenance holes at locations indicated on drawings and as required for a complete and maintainable underground electrical distribution system installation.

amanda.mendoza

Stamp


ISSUED: 03/14/14


2. Excavation, Trenching and Backfill: Provide excavation, trenching and backfill in compliance with applicable utility installation requirements and Section, 31 20 00 Earthwork.

3. For utility underground electrical and telecommunication distribution systems and structures, located in the public way or on Metro property, comply with the installation design requirements, design plans, conditions, restrictions, and construction methods imposed by the respective utility service companies, the City of Los Angeles, and all associated city agencies, such as; the Los Angeles Department of Water and Power (LADWP), the Los Angeles Department of Transportation (LADOT), the Los Angeles Bureau of Street Lighting (LABSL) and other applicable city BOE departments. The Contractor shall be responsible for coordinating the underground electrical and telecommunication distribution system design with all utilities and city agencies.

B. Duct Banks

1. Inspect ducts and couplings to ensure only clean and undamaged units are incorporated in work.

2. Duct banks or conduits - Minimum slope of three inches to each 100 feet away from buildings and towards maintenance holes; run in straight lines between indicated changes in direction.

3. Provide individual conduits grouped together to form duct banks - Conform to Metro standard installation details and these specifications.

4. Make horizontal and vertical changes in direction exceeding 10 degrees by long sweep bends having minimum radius of 25 feet; manufactured bends - minimum radius of 48 inches for conduits at termination point to station or electrical equipment.

5. Terminate conduits in end-bells where duct lines enter underground maintenance holes and utility vaults.

6. RPM spacers - Place not more than six feet apart; transmit no vertical load to conduit.

7. Install ducts, joints and space separators in accordance with manufacturer's instructions.

8. During construction, protect partially completed duct lines from entrance of debris by means of suitable caps or plugs. As each section of duct line is completed between maintenance holes, pull boxes, and electrical vaults, draw testing mandrel, not more than 1/4 inch less than size of conduit, through each conduit, followed by brush with stiff bristles until conduit is clear of particles of earth, sand or gravel; immediately install conduit caps or plugs.

9. Install two strips of red warning tape above wood enclosed ductbank. Indicate electrical or power facilities in accordance with APWA.

amanda.mendoza

Stamp


ISSUED: 03/14/14


10. Install 1/8 inch or larger diameter polypropylene pulling cord in ducts. Fasten each cord to pull iron in vault with two feet minimum slack.

C. Concrete Pull Boxes

Install pull box tops flush with sidewalks and curbs, or placed 1/2 inch above surrounding grades when remote from curbed roadways or sidewalks. Seal conduit, cable, ground rod entrances and unused openings with mortar.

D. Maintenance Holes

Locations of Maintenance Holes - Approved installation design and construction drawings are required before construction of maintenance hole is started. Top, walls and bottom shall be reinforced concrete. Walls and bottom shall be of monolithic concrete construction. Set precast maintenance hole concrete vaults on well-compacted soil with minimum of six inches of crushed stone base. Seal sumps. Where duct lines enter maintenance holes, sections of duct may be cast in concrete or may enter manhole through square or rectangular opening of suitable dimensions. Install cable-pulling iron in wall opposite each ductbank entrance.

3.15 VIBRATION AND ISOLATION RESTRAINING DEVICES

A. Vibration isolation units

1. Mount floor supported transformers, in excess of 300 kVA, located within building on isolation units utilizing Type MS springs, appropriately secured to transformer housing. Spring units - Selected for minimum static deflection of 1.5 inches.

2. Mount floor supported transformers, less than 300 kVA, located within building on vibration isolation rails utilizing Type MN neoprene mounts selected to deflect a minimum of 0.25 inch.

3. Suspended transformers less than 45 kVA - Support on appropriate steel frame from Type HS hangers, selected for a minimum static deflection of 0.75 inch.

4. Mount generators in prefabricated generator housing utilizing vibration isolators per manufacturer recommendations. Mount prefabricated generator housing to direct burial double steel wall fuel tank utilizing vibration isolators. Obtain approved generator installation design plans, prior to the commencement of work.

B. Vibration and Seismic Restraints

1. Bolt restraints to floor with 1/2 inch lag type bolts.

2. Install restraints after equipment has been set on isolators and after isolators have been adjusted for proper deflection.

3. Submit and obtain approved seismic restraint installation design including

amanda.mendoza

Stamp


ISSUED: 03/14/14


calculations prior to commencement of any work.

3.16 IDENTIFICATION OF ELECTRICAL SYSTEMS

A. General

1. Verify identity of each item before installing identification products.

2. Location: Install identification materials and devices at locations for most convenient viewing without interference with operation and maintenance of equipment.

3. Apply identification devices to surfaces that require finish after completing finish work.

4. Self-Adhesive Identification Products: Clean surfaces before application, using materials and methods recommended by manufacturer of identification device.

5. Attach signs and plastic labels that are not self-adhesive type with mechanical fasteners appropriate to the location and substrate.

6. System Identification Color-Coding Bands for Raceways and Cables: Each color-coding band shall completely encircle cable or conduit. Place adjacent bands of two-color markings in contact, side by side. Locate bands at changes in direction, at penetrations of walls and floors, at 50-foot maximum intervals in straight runs, and at 25-foot maximum intervals in congested areas.

7. Aluminum Wraparound Marker Labels and Metal Tags: Secure tight to surface of conductor or cable at a location with high visibility and accessibility.

8. Painted Identification: Comply with requirements in Division 09 painting Sections for surface preparation and paint application.

B. Identification Schedule

1. Accessible Raceways, Armored and Metal-Clad Cables, More Than 600 V: Snap-around labels. Install labels at 10-foot maximum intervals.

2. Accessible Raceways and Cables within Buildings: Identify the covers of each junction and pull box of the following systems with self-adhesive vinyl labels with the wiring system legend and system voltage. System legends shall be as follows:

3. Power-Circuit Conductor Identification, 600 V or Less: For conductors in pull and junction and boxes, use color-coding conductor tape to identify the phase.

4. Electrical Circuit Power Sources

a. Essential Power

b. Non-Essential Power

amanda.mendoza

Stamp


ISSUED: 03/14/14


c. Vital Power (UPS)

5. Color-coding for phase and voltage level identification, 600V or less: For conductors in pull and junction boxes, use color coding conductor tape to identify the phase.

a. Color shall be factory applied or field applied for sizes larger than No. 8 AWG.

b. Colors for 120/208V circuits:

1) Phase A: Black.

2) Phase B: Red.

3) Phase C: Blue.

c. Colors for 277/480V circuits:

1) Phase A: Brown.

2) Phase B: Orange.

3) Phase C: Yellow.

d. Field Applied, Color-Coding Conductor Tape: Apply in half-lapped turns for a minimum distance of 6 inches from terminal points and in boxes where splices or taps are made. Apply last two turns of tape with no tension to prevent possible unwinding. Locate bands to avoid obscuring factory cable markings.

C. Install instructional sign including the color-code for grounded and ungrounded conductors using adhesive-film-type labels.

D. Conductors to Be Extended in the Future: Attach marker tape to conductors and list source.

E. Auxiliary Electrical Systems Conductor Identification:

1. Identify field-installed alarm, control, and signal connections.

2. Identify conductors, cables, and terminals in enclosures and at junctions, terminals, and pull points. Identify by system and circuit designation.

3. Use system of marker tape designations that is uniform and consistent with system used by manufacturer for factory-installed connections.

4. Coordinate identification with Project Drawings, manufacturer's wiring diagrams, and the Operation and Maintenance Manual.

5. Workspace Indication: Install floor marking tape to show working clearances in the direction of access to live parts. Workspace shall be as required by NFPA 70

amanda.mendoza

Stamp


ISSUED: 03/14/14


and 29 CFR 1926.403 unless otherwise indicated. Do not install at flush-mounted panelboards and similar equipment in finished spaces.

6. Warning Labels for Indoor Cabinets, Boxes, and Enclosures for Power and Lighting: Self-adhesive warning labels.

7. Comply with 29 CFR 1910.145.

8. Identify system voltage with black letters on an orange background.

9. Apply to exterior of door, cover, or other access.

10. For equipment with multiple power or control sources, apply to door or cover of equipment including, but not limited to, the following:

a. Power transfer switches.

b. Controls with external control power connections.

F. Operating Instruction Signs: Install instruction signs to facilitate proper operation and maintenance of electrical systems and items to which they connect. Install instruction signs with approved legend where instructions are needed for system or equipment operation.

G. Emergency Operating Instruction Signs: Install instruction signs with white legend on a red background with minimum 3/8-inch- high letters for emergency instructions at equipment used for power transfer.

H. Equipment Identification Labels: On each unit of equipment, install unique designation label that is consistent with wiring diagrams, schedules, and the Operation and Maintenance Manual. Apply labels to disconnect switches and protection equipment, central or master units, control panels, control stations, terminal cabinets, and racks of each system. Systems include power, lighting, control, communication, signal, monitoring, and alarm systems unless equipment is provided with its own identification.

1. Labeling Instructions:

a. Indoor Equipment: Self-adhesive, engraved, laminated acrylic or melamine label. Unless otherwise indicated, provide a single line of text with 1/2-inch- high letters on 1-1/2-inch- high label; where two lines of text are required, use labels 2 inches high.

b. Outdoor Equipment: Engraved, laminated acrylic or melamine label.

c. Elevated Components: Increase sizes of labels and letters to those appropriate for viewing from the floor.

d. Unless provided with self-adhesive means of attachment, fasten labels with appropriate mechanical fasteners that do not change the NEMA or NRTL rating of the enclosure.

amanda.mendoza

Stamp


ISSUED: 03/14/14


2. Equipment to be labeled:

a. Panelboards: Typewritten directory of circuits in the location provided by panelboard manufacturer. Panelboard identification shall be self-adhesive, engraved, laminated acrylic or melamine label.

b. Enclosures and electrical cabinets.

c. Access doors and panels for concealed electrical items.

d. Switchgear.

e. Switchboards.

f. Transformers: Label that includes tag designation shown on Drawings for the transformer, feeder and panelboard or equipment supplied by the secondary.

g. Substations.

h. Emergency system boxes and enclosures.

i. Motor control centers

j. Enclosed switches.

k. Enclosed circuit breakers.

l. Enclosed controllers.

m. Variable speed controllers.

n. Push-button stations.

o. Power transfer equipment.

p. Contactors.

q. Remote controlled switches, and control devices.

r. Battery-inverter units.

s. Battery racks.

t. Power generating units.

u. Monitoring and control equipment.

v. UPS equipment.

3.17 MOTORS

amanda.mendoza

Stamp


ISSUED: 03/14/14


A. Test motor insulation before connections of wiring.

B. Wire and connect motors in accordance with manufacturer's recommendations.

C. Ground motor enclosure as specified in Section 26 05 26, Grounding and Bonding for Electrical Systems.

D. Provide liquid-tight flexible metal conduit connection at motor.

E. Provide code required disconnect switches for each installed motor. Refer to article

2.13 Disconnecting Devices of this section for disconnect switch requirements.

F. Perform tests, and procedures as specified in Section 26 08 00, Commissioning of Electrical Systems, in presence of Metro. Furnish equipment required to perform tests. Perform the following test on installed motors:

1. Test motors for correct rotation.

2. Test and verify insulation resistance to ground of non-grounded conductor is minimum 10 megohms.

3. Test motor enclosure for continuity to grounding system.

4. Test operation of circuits and controls for motors.

5. When testing, operate each control a minimum of 10 times, and each circuit continuously for a minimum of 1/2 hour.

END OF SECTION

amanda.mendoza

Stamp

basic electrical material and methods part 1 … conformed... · basic electrical material and...

Documents