GRAYBOY, Inc. 2007

Illustrated CodeChanges

Stallcups

2008

GRAYBOY, Inc. 2007

INSTALLATIONS UNDER THE EXCLUSIVECONTROL OF AN ELECTRIC UTILITY

SERVICE DROPS OR SERVICE LATERALS, AND ASSOCIATED METERING

LOCATED IN LEGALLY ESTABLISHED EASEMENTS, OR RIGHT-OF-WAYSDESIGNATED BY OR RECOGNIZED BY PUBLIC SERVICE COMMISSIONS,OR OTHER REGULATORY AGENCIES HAVING JURISDICTION FOR SUCHINSTALLATIONS

ON PROPERTY OWNED OR LEASED BY THE ELECTRIC UTILITY FORTHE PURPOSE OF COMMUNICATIONS, METERING, GENERATION,CONTROL, TRANSFORMATION, TRANSMISSION OR DISTRIBUTION OFELECTRIC ENERGY.

TRANSMISSION

DISTRIBUTION

GENERATION

WORKSPACE OSHA 1910.268(n)(12)(ii)

GROUND WIRELIGHT ON UTILITY POLEBELOW ATTACHMENTS NESC - 238

CATV LINE

TELECOMMUNICATIONSLINE

NOT COVERED90.2(B)(5)b

Purpose of Change: This revision clarifies that any agreements will be limited, other than a legally established easementor right-of-way, that a utility company can use to make installations that are outside the scope of the NEC.

1Ill.: pg. 1-2

NEC: pg. 21

GRAYBOY, Inc. 2007

L1N

L2 L3L1

N

L2 L3

L1 NL2

NEUTRAL SHALL BE GROUNDED

THIS 3-WIRE DC SYSTEM WITH NEUTRAL SHALL BE GROUNDED PER 250.162(B)

OCPD

TO DC POWER SOURCE

DC POWERSUPPLY

NEUTRAL CONDUCTORNEUTRAL POINT

ARTICLE 100

Purpose of Change: Two new definitions have been added to clarify what constitutes a neutral conductorand a neutral point.

2Ill.: pg. 1-22NEC: pg. 28

GRAYBOY, Inc. 2007

2000 by James G. Stallcup

QUALIFIED PERSON ARTICLE 100

DANGER-TESTINGBEING DONE

YELLOW TAPE USEDAS GUARD OR BARRIER

TEST OPERATORREADING INSTRUMENTS

QUALIFIED PERSON KNOWS CONSTRUCTION, OPERATION,AND HAZARDS OF EQUIPMENT

TRAINED, SKILLED, WITH KNOWLEDGETO RECOGNIZE AND AVOID HAZARDS

ELECTRICALEQUIPMENT

QUALIFIED PERSONARTICLE 100

Purpose of Change: This revision clarifies that qualified persons that have received safetytraining and knows how to recognize and avoid the hazards involved.

3Ill.: pg. 1-24NEC: pg. 29

GRAYBOY, Inc. 2007

PRESSURE

TWO DISKS WITH BOLT

OPENING IS REQUIRED TO BESEALED WITH ONEOF THE FOLLOWING:

BLANK TO COVERCB OPENING

PANELBOARD COVER

ENCLOSUREOR

BOX

UNUSED OPENINGS110.12(A)

Purpose of Change: This revision indicates all unused openings should be closed,except for those required for the proper mounting of such equipment or enclosure.

4Ill.: pg. 1-34NEC: pg. 33

GRAYBOY, Inc. 2007

FLASH PROTECTION110.16

Purpose of Change: This revision now clarifies that flash protection markings are required for large fusibleswitches and similar equipment where a flash hazard may exist.

5Ill.: pg. 1-36NEC: pg. 34

ELECTRICAL EQUIPMENTMUST BE MARKED INFIELD TO WARN WORKEROF AN ELECTRIC ARCFLASH

WORKER

QUALIFIEDPERSON

MARKING ONEQUIPMENTWARNS WORKEROF ARC FLASHHAZARD

NOTE 2: SEE ANSI Z535.4 FOR GUIDELINESPERTAINING TO DESIGNING SAFETY SIGNSAND LABELS TO PROVIDE WARNINGS, ETC.

NOTE 1: SEE NFPA 70E FOR ASSISTANCE INDETERMINING EXPOSURE, PLANNING SAFEWORK PRACTICES, AND SELECTING PERSONALPROTECTIVE EQUIPMENT.

SWITCHBOARDSPANELBOARDSINDUSTRIAL CONTROL PANELSMETER SOCKET ENCLOSURESMOTOR CONTROL CENTERSLARGE FUSIBLE SWITCHESSIMILAR ELECTRICAL EQUIPMENT

ELECTRICAL EQUIPMENT

LARGEFUSIBLE SWITCH

G

RAYB

OY,Inc.2007

GIVEN:APPENDIX, B-5.2 IN NFPA 70E

EMB = 1038.7 DB -1.4738 tA (.0093 F2 -.3453F + .59675)

DB = 18 INCHES tA = 1/2 CYCLE OR .0084 SEC. F = 35 kA MVA = 11

Step 1: EMB = (1038.7)(0.014125)(.0084)(11.3925

- 12.0855 + 5.9675)Step 2: EMB = (14.671638)(.0084)(5.2745)

Step 3: EMB = (14.671638)(.0443)

Step 4: EMB = 0.649954 cal/cm2

Solution:From Table 3-3.9.3 in Part II of NFPA 70E,

0.649954 cal/cm2 requires a hazard riskcategory of 0 with one layer of untreated

cotton (total weight oz/yd2 is 4.5-7).Note: This procedure is used only for 600 volts or lesssystems.

(Review NFPA 70E carefully)Step 5: Finding flash protection boundary

Dc = (53 x MVA x t)

Dc = (53 x 11 x .0084)

Dc = 2.21 ft.

Solution:Based on the given parameters, the authorssuggest an arc-flash boundary of 2.21 ftand an incident energy value of

0.649954 cal/cm2.

Note: Authors recommend that only engineers orqualified personnel calculate and determine the boundary.

APPLICATION OF FORMULA:APPENDIX B-5.2 IN PART II OF NFPA 70E

5.2Ill.: pg. 1-36NEC: pg. 34

GRAYBOY, Inc. 2007

WORKING SPACE

NOTE THAT THE WORKSPACE IS UNOBSTRUCTEDWITHOUT A COLUMN, ETC. BLOCKING ACCESSAND EXIT ROUTE. IN THIS CASE, SINGLE DOORENTRY IS PERMITTED PER 110.26(C)(2)(a).

PANIC HARDWAREON INSIDE OF DOOR

DOOR w/PANIC BARS,PRESSURE PLATES, ETC.

DOOR OPENSTOWARDS EGRESSOF ROOM

EXIT ROUTE

ELECTRICEQUIPMENT

WORKING SPACE 110.2(C)(3)

NEC CLEARANCES TABLE 110.26(A)(1)

(600 V OR LESS) TABLE 110.34(A)

(OVER 600 V) 110.26(F) 110.34(F)

FOR EQUIPMENT RATED 1200 A OR MORE AND OVER 6' WIDE (1.8 m) THERE SHALLBE ONE ENTRANCE AND EGRESS FROM AND NOT LESS THAN 24" (610 mm) WIDEAND 6' 6" (2 m) HIGH AT EACH END OR WORKSPACE SHALL BE DOUBLED.

SWITCHBOARD RATED 1200 A ORMORE AND OVER 6' WIDE (1.8 m)

EQUIPMENTLARGE

DOOR SHALL OPEN IN THEDIRECTION OF EGRESS IFLESS THAN 25' FROM THENEAREST EDGE OF THEWORKING SPACE AND BEEQUIPPED WITH PANICBARS, PRESSURE PLATE,OR OTHER DEVICES THATARE NOT NORMALLYLATCHED BUT OPEN UNDERSIMPLE PRESSURE.

25'

PERSONNEL DOORS110.26(C)(3)

Purpose of Change: This revision clarifies that the personnel door(s) shall have panic bars and similar equipmentand open in the direction of egress if located less than 25 ft from the nearest edge of the working space.

6Ill.: pg. 1-45NEC: pg. 37

GRAYBOY, Inc. 2007

BUILDING

GROUNDED CONDUCTORTERMINAL BAR 250.24(B)

EGC TERMINAL BAR 250.24(B)

LATERAL FROMMASTER METER

250 KCMIL cu.

MAIN BONDING JUMPER (MBJ) 250.24(B)

METAL WATERPIPE SYSTEMS 250.52(A)(1)

250 KCMIL cu. REQUIRES2 AWG cu. CONDUCTOR

MBJ IS 2 AWG COPPER

SIZING (MBJ) 250.24(B); 250.28(D); Table 250.66

GENERAL200.2

Purpose of Change: This new subsection clarifies that a busbar or conductor shall be used to makethe connection between the neutral bar and the equipment grounding terminal bar, not the metal ofthe enclosure.

7Ill.: pg. 2-2

NEC: pg. 43

GRAYBOY, Inc. 2007

CB DISCONNECT BOTH CIRCUITS1 AND 2 SIMULTANEOUSLY ORIGINATE FROM THE SAME

PANELBOARD 210.4(A) 210.4(B)

CIRCUIT 1SUPPLYINGEQUIPMENT

CIRCUIT 2SUPPLYINGEQUIPMENT

DEVICEBOX

GROUPING WIRE TIES OR

SIMILAR MEANS 210.4(D)

NOTE: GROUPING SHALL NOT APPLY IFTHE CIRCUIT ENTERS FROM A CABLEOR RACEWAY UNIQUE TO THE CIRCUITTHAT MAKES THE GROUPING OBVIOUS.

LINK ON RECEPTACLE CONNECTING UNGROUNDED(HOT) TERMINALS (BRASS COLOR) HAS BEEN BROKEN 210.4(B)

GROUPING210.4(D)

Purpose of Change: This new subsection requires grouping all the conductors of a multiwire branch circuit tohelp ensure that all ungrounded conductors are disconnected and grounded (neutral) conductor is de-energized,especially during service work.

8Ill.: pg. 2-6

NEC: pg. 45

GRAYBOY, Inc. 2007

IDENTIFICATION OF EACH PHASE OR LINE TERMINATIONS SPLICE POINTS CONNECTIONS 210.5(C)

3-CIRCUITS 480/277 V

A MEANS OF IDENTIFICATION OFUNGROUNDED CONDUCTORS SHALLBE POSTED AT EACH PANELBOARDOR DOCUMENTED IN A MANNER THATIS READILY AVAILABLE 210.5(C)

3-CIRCUITS 208/120 V

IDENTIFICATION OFSYSTEMS ANDCIRCUITS 480/277 V 208/120 V

PERMITTED METHODS OFIDENTIFICATION SEPARATE COLOR CODING MARKING TAPE TAGGING OTHER APPROVED MEANS 210.5(C)

UNGROUNDED CONDUCTORS210.5(C)

Purpose of Change: This revision clarifies that each ungrounded conductor of a branch circuit shall beidentified by phase or line and by system at all termination, connection, and splice points.

9Ill.: pg. 2-8

NEC: pg. 46

GRAYBOY, Inc. 2007

NOTE: WHERE RECEPTACLES ARE USED IN INDUSTRIAL ESTABLISHMENTS ONLY, GFCIPROTECTION ON RECEPTACLES SHALL NOT BE REQUIRED WHERE THE CONDITIONS OFMAINTENANCE AND SUPERVISION ENSURE THAT ONLY QUALIFIED PERSONNEL AREINVOLVED, THAT ARE LIMITED TO USE WITH EQUIPMENT QUALIFIED UNDER AN ASSUREDEQUIPMENT GROUNDING CONDUCTOR PROGRAM AS SPECIFIED IN 590.6(B)(2).

OUTDOORS 210.8(B)(4)

ALL NON-DWELLINGRECEPTACLE OUTLETSSHALL BE GFCI PROTECTED 210.8(B)(4)

A PUBLIC SPACE IS ANY SPACE THAT IS FOR USE BY,OR IS ACCESSIBLE TO, THE PUBLIC HAS BEEN DELETED.NOW APPLIES TO ALL 15- AND 20-AMPERE, 125 VOLTSINGLE-PHASE RECEPTACLES 210.8(B)(4)

OTHER THAN DWELLINGS210.8(B)(4)

Purpose of Change: This revision requires GFCI protection for all 15- and 20-ampere, 125-voltsingle-phase receptacles installed outdoors.

10Ill.: pg. 2-14NEC: pg. 47

GRAYBOY, Inc. 2007

AFCI NOT REQUIRED TO BEINSTALLED WITHIN 6' (1.8 m)OF BRANCH CIRCUIT OCPDsMEASURED ALONG CIRCUITCONDUCTORS 210.12(B), Ex. No. 1

AFCI

FLOORLAMP

CHAINLIGHT

FLUORESCENTFIXTURE

STEREO

DRESSERLAMPS

BEDLAMP

TELEVISIONTABLELAMP

METAL RACEWAY OR CABLEW/METALLIC SHEATH (DELETED) 210.12, Ex. - 2005 NEC

NOTE: AFCI PROTECTION FOR ALL 120-VOLT, SINGLE-PHASE, 15- AND 20-AMPERE BRANCH CIRCUITSSUPPLYING OUTLETS SHALL BE INSTALLED INDWELLING UNITS IN FAMILY ROOMS, DINING ROOMS,LIVING ROOMS, PARLORS, LIBRARIES, DENS,BEDROOMS, SUN ROOMS, RECREATION ROOMS,CLOSETS, HALLWAYS, OR SIMILAR ROOMS OR AREAS.

DWELLING UNITS210.12(B), Exception

Purpose of Change: This revision clarified that enclosing the 6 ft (1.8 m) of circuit conductors in a metalraceway or metallic-sheathed cable is not required.

11Ill.: pg. 2-18NEC: pg. 49

GRAYBOY, Inc. 2007

Purpose of Change: A new Exception No. 2 has been added to permit AFCI protectionto be omitted if the branch circuit to a fire alarm system is installed in RMC, IMC, EMT,or steel armored cable (Type AC).

DETECTORS

AFCI PROTECTIONNOT REQUIRED210.12(B), Ex. 2

WIRING METHOD RMC IMC EMT STEEL ARMORED CABLE

(TYPE AC) 210.12(B), Ex. 2 250.118

DWELLING UNITS210.12(B), Exception No. 2

PERMITTED BOXES METAL OUTLET METAL JUNCTION 210.12(B), Ex. 2

12Ill.: pg. 2-20NEC: pg. 49

GRAYBOY, Inc. 2007

NOTE: BALCONIES, DECKS, OR PORCHES WITH A USABLE AREA OF LESSTHAN 20 SQ. FT. ARE NOT REQUIRED TO HAVE A RECEPTACLE INSTALLED.

IllustrationsbyKristaDarnell'96

Grayboy&Assoc.

OVER 6' 6" (2 m) SHALL NOT BECONSIDERED TO BE ACCESSIBLE.(CHRISTMAS LIGHTRECEPTACLES)

IF BALCONY IS NOT ACCESSIBLE RECEPTACLE NOT REQUIRED 210.52(E)(3)

RECEPTACLE ON OPENFRONT PORCH REQUIRED 210.52(E)(3)

OUTDOOR OUTLETS210.52(E)(1) THRU (E)(3)

Purpose of Change: New subsection titles have been added for usability. A new subsection (3) has beenadded to require a receptacle be installed on any porch, deck, or balcony where accessible from inside thedwelling unit. A new Exception to (3) does not require a receptacle on a balcony, deck, or porch with a useablearea of less than 20 sq ft.

13Ill.: pg. 2-26NEC: pg. 54

GRAYBOY, Inc. 2007

SUBSTATION WITHFEEDER DISCONNECT

DISCONNECTING MEANS MORE THAN ONE SWITCH

OR CIRCUIT BREAKER COMBINE THE RATINGSTO DETERMINE THE OVERALLRATING OF THE DISCONNECTINGMEANS

225.39

SEPARATE BUILDING 2

PANEL

IDENTIFICATION 225.37

DISCONNECT CONSTRUCTION 225.38

ACCESSTO OCPDs 225.40

RATING OF DISCONNECT225.39

THE RATING SHALL NOT BE LOWER THAN: ONE-CIRCUIT INSTALLATION. NOT LESS THAN 15 AMPERES TWO-CIRCUIT INSTALLATIONS. NOT LESS THAN 30 AMPERES ONE-FAMILY DWELLING. NOT LESS THAN 100 AMPERES ALL OTHERS. NOT LESS THAN 60 AMPERES

Purpose of Change: This revision clarifies that the ratings of all switches or circuit breakers shall bepermitted to be combined to determine the overall rating of the disconnecting means.

14Ill.: pg. 2-39NEC: pg. 71

GRAYBOY, Inc. 2007

CABLE TRAY SHALL BE IDENTIFIED WITH

PERMANENTLY AFFIXED LABELSWITH THE WORDING SERVICE-ENTRANCE CONDUCTORS

LABEL SHALL BE VISIBLE AFTERINSTALLATION

READILY TRACEABLE THROUGH THEENTIRE LENGTH OF THE CABLE TRAY

230.44, Ex.

CABLE TRAY W/BARRIER 230.44, Ex.

SERVICE CONDUCTORSIN SINGLE LAYERS4/C - 350 KCMIL THHN cu.

OTHER THAN SERVICECONDUCTORS, STACKED5 - 4/C - 1/0 AWG THHN cu.INSTALLED PER ARTICLE 392

SOLIDFIXEDBARRIER 230.44, Ex.

CABLE TRAYS230.44, Ex.

Purpose of Change: This revision clarifies that service-entrance conductors installed in cable trays with otherthan service-entrance conductor shall be separated with a barrier and shall be identified with permanently affixedlabels on the cable tray that are readily traced through the entire length.

15Ill.: pg. 2-45NEC: pg. 77

GRAYBOY, Inc. 2007

PANEL

DISCONNECT CONSTRUCTION 225.38

ACCESSTO OCPDS 225.40

SEPARATE BUILDING 2

SERVICEDISCONNECT 230.205(A)

LOCATION230.205(A)

Purpose of Change: This revision clarifies that on private property, the service disconnectshall be permitted to be in a location that is not readily accessible, such as the top of a pole.

16Ill.: pg. 2-50NEC: pg. 82

GRAYBOY, Inc. 2007

DEFINITION OFCLASSIFICATION OF CIRCUITS 760.2

CONDUCTORS 760.82 TABLE 760.61 TABLE 760.82(I) 14 AWG cu. THWN

ALARM

CABLE

ACTIVATEEXTINGUISHER

CONTROL EQUIPMENTDOORS, FANS, ELEVATORS, ETC.

OCPDs AND LOCATION 760.23 760.24

CONDUIT

DETECTORS

NPLFA CONDUCTORS 16 AWG cu. TFFN

POWER LIMITS 760.15

TOPANEL

Step 1: Finding conductor A760.23; Table 310.16;14 AWG cu. = 20 A16 AWG cu. = 10 A

Step 2: Selecting OCPD for alarm circuitsTable 310.16; 760.23; 240.4(D)20 A (14 AWG cu.) requires 15 A OCPD10 A (16 AWG cu.) requires 10 A OCPD

Solution: The size OCPD for the 14 AWG TFFNcopper conductors is 15 amps and10 amps for the 16 AWG TFFNcopper conductors.

Sizing OCPD for fire alarm circuits

APPLYING 240.4(D)

SMALL CONDUCTORS240.4(D)

Purpose of Change: This revision adds small conductors in 18 AWG and 16 AWG sizes to correspond to thepermission to use these smaller conductors.

17Ill.: pg. 2-51NEC: pg. 84

GRAYBOY, Inc. 2007

APPLYING 240.21(C)(2)(4)

Step 1: Calculating primary FLA240.21(C)(2)(4)

A = 75 kVA 480 V x 1.732A = 75 kVA 831 V

A = 90 A

Step 2: Calculating primary size OCPD90 A x 125% = 112.5 A

Step 3: Finding primary size OCPD240.6(A)112.5 A requires 125 A

Step 4: Finding ratio240.21(C)(2)(4)

Ratio = 480 V / 208 VRatio = 2.31

Step 5: Calculating secondary FLA240.21(C)(2)(4)

A = 125 A OCPD x 2.31 ratioA = 288.75

Step 6: Sizing conductorsA = 288.75 A 10A = 28.875 A28.875 A requires 10 AWG cu.

Solution: The size THWN copper conductorsis at least 10 AWG copper andcant be longer than 10 ft.

Sizing primary OCPD

Sizing secondary conductors

SERVICE CONDUCTORS 230.42(A)(1)

OCPD 125 A

ONE CONDUCTORSHOWN FORSIMPLICITY

OCPD 240.21(C)(2)(4)

TRANSFORMER SECONDARY CONDUCTORSNOT OVER 3 m (10 FT) LONG

240.21(C)(2)(4)

TRANSFORMER 75 kVA 3 480 V PRI. 208Y/120 V SEC.

SECONDARY CONDUCTORS NOT OVER 10' (3 m) LONG 240.21(C)(2)

Purpose of Change: This revision clarifies that this section correlates with the conventional 10-foot tap rule in 240.21(B)(1).

18Ill.: pg. 2-53NEC: pg. 88

GRAYBOY, Inc. 2007

NOTE: INSTALLATION OF THE OVERCURRENTPROTECTION WITHIN A HAZARDOUS LOCATIONSHALL ALSO BE PERMITTED.

FUSE PROTECTION

CIRCUIT BREAKERPROTECTION

UPS WITH STORAGEBATTERIES

OCPD INSTALLED AS CLOSEDAS PRACTICABLE TO THEBATTERY TERMINALS PER240.21(H) AND 480.5.

BATTERY CONDUCTORS240.21(H)

Purpose of Change: A new subsection has been added to permit overcurrent protection to beinstalled as close as practicable to the storage battery terminals in a non-hazardous location.

19Ill.: pg. 2-57NEC: pg. 89

GRAYBOY, Inc. 2007

NOTE: FOR CALCULATED APPLICATIONS, THE ENGINEER SHALL ENSURE THAT THEDOWNSTREAM CIRCUIT BREAKER(S) THAT ARE PART OF THE SERIES COMBINATIONREMAIN PASSIVE DURING THE INTERRUPTION PERIOD OF THE LINE SIDE FULLYRATED, CURRENT-LIMITING DEVICE.

CB WITH A HIGHERAIC RATING 240.86

CB WITH A LOWER AICRATING 240.86

LOAD SIDE

SERIES COMBINATIONRATING SHALL BE MARKED 240.86(A)

MBJGES

GEC

FEEDER

EXISTING INSTALLATIONS ONLY

PROCESSINGEQUIPMENT

SELECTED UNDER ENGINEERING SUPERVISIONIN EXISTING INSTALLATIONS

240.86(A)

Purpose of Change: This revision clarifies that for calculated applications, the engineer shall ensure that the downstreamcircuit breaker(s) that are part of the series combination remain passive during the interruption period of the line sidefully rated, current-limiting device.

20Ill.: pg. 2-59NEC: pg. 92

GRAYBOY, Inc. 2007

MARKING:CAUTION - SERIES COMBINATION RATED _ AMPERES. REPLACEWITH:_ TYPE BREAKER_ TYPE FUSE

CB WITH A HIGHERAIC RATING 240.86

CB WITH A LOWER AICRATING 240.86

PROCESSINGEQUIPMENTLOAD SIDE

SERIES COMBINATIONRATING MUST BE MARKED 240.86(A)

MBJGES

GEC

SELECTED UNDER ENGINEERING SUPERVISIONIN EXISTING INSTALLATIONS

240.86(A)

Purpose of Change: This revision clarifies that specific markings must be readily visible for both theupstream and the downstream devices in series combination systems.

20.2Ill.: pg. 2-59NEC: pg. 92

GRAYBOY, Inc. 2007

OCPDUNDER SHORT CIRCUIT CONDITIONS,CONDUCTORS MUST NOT EXCEED THEIRSHORT CIRCUIT TEMPERATURE LIMITS

SORT CIRCUIT FORMULA FOR COPPER CONDUCTORS(I /A)t = 0.0297 LOG10 [(T2 + 234)(T1 + 234)]

SHORT CIRCUIT FORMULA FOR ALUMINUM CONDUCTORS(I /A)t = 0.0125 LOG10 [(T2 + 228)(T1 + 228)]

2 2

2 2

SHORT-CIRCUIT FORMULA VALUES I = SHORT-CIRCUIT CURRENT IN AMPERES A = CONDUCTOR ARE IN CIRCULAR MILS t = TIME OF SHORT-CIRCUIT IN SECONDS (FOR TIMES LESS THAN OR EQUAL TO 10 SECONDS) T1 = INITIAL CONDUCTOR TEMPERATURE IN DEGREES CELSIUS T2 = FINAL CONDUCTOR TEMPERATURE IN DEGREES CELSIUS COPPER CONDUCTOR WITH PAPER, RUBBER, VARNISHED CLOTH INSULATION, T2 = 200 COPPER CONDUCTOR WITH TERMOPLASTIC INSULATION, T2 = 250 COPPER CONDUCTOR WITH CROSS-LINKED POLYETHYLENE INSULATION, T2 = 250 COPPER CONDUCTOR WITH ETHYLENE PROPYLENE RUBBER INSUALTION, T2 = 250 ALUMINUM CONDUCTOR WITH PAPER, RUBBER, VARNISHED CLOTH INSULATION, T2 = 200 ALUMINUM CONDUCTOR WITH THERMOPLASTIC INSULATION, T2 = 150 ALUMINUM CONDUCTOR WITH CROSS-LINKED POLYETHYLENE INSULATION, T2 = 250 ALUMINUM CONDUCTOR WITH ETHYLENE PROPYLENE RUBBER INSULATION, T2 = 250

FEEDER TAPS240.92(B)

Purpose of Change: This new subsection will increase the enforceability necessary by the inspection communityand will limit the application of expanding feeder tap conductors for supervised industrial installations.

21Ill.: pg. 2-62NEC: pg. 92

GRAYBOY, Inc. 2007EBJ

250.102(D)

CONNECTION EGC

CLEANSURFACES 250.12

EGC

MBJ 250.28(D)

GROUND CLAMPSOR FITTINGSCONNECTING THEGEC TO THE RODMUST BE LISTEDFOR DIRECT BURIALAND PROTECTEDFROM PHYSICALDAMAGE

FITTING GEC

ROD

CONNECTION FOR GROUNDINGAND BONDING EQUIPMENT LISTED PRESSURE CONNECTORS TERMINAL BARS PRESSURE CONNECTORS LISTED AS

GROUNDING AND BONDING EQUIPMENT EXOTHERMAL WELDING PROCESS MACHINE SCREW-TYPE FASTENERSTHAT ENGAGE NOT LESS THAN TWOTHREADS OR ARE SECURED WITH A NUT

THREAD-FORMING MACHINE SCREWS THAT ENGAGE NOT LESS THAN TWO THREADSIN THE ENCLOSURE

CONNECTIONS THAT ARE PART OF A LISTEDASSEMBLY

OTHER LISTED MEANS 250.8(A)

NOTE: CONNECTION DEVICES OR FITTINGS THATDEPEND SOLELY ON SOLDER SHALL NOT BE USED.

CONNECTION OF GROUNDING AND BONDING EQUIPMENT250.8(A); (B)

SELF-TAPPINGSCREWS WITHAT LEAST TWOTHREADS

Purpose of Change: This revision clarifies the permitted methods for connections of grounding and bonding equipment.

22Ill.: pg. 2-66NEC: pg. 97

GRAYBOY, Inc. 2007

SERVICECONDUCTORS

MAKE UP BOX

METER BASESERVICE PANEL

TRANSFER SWITCH GROUNDED CONDUCTOR NOT

SOLIDLY INTERCONNECTEDTO THE SERVICE GROUNDEDCONDUCTOR

250.20(D)

GENERATOR SEPARATELY DERIVED

SYSTEM SHALL BE GROUNDED 250.20(D) 250.30(A)

TO LOAD

TO SEPARATELYDERIVED SYSTEM

TO SERVICEEQUIPMENT

NEUTRAL NOTSOLIDLY GROUNDED

CLASSIFIED AS A SEPARATELY DERIVED SYSTEM

TO LOAD

TO GENERATOR NOT SEPARATELY

DERIVED SYSTEM

TO SERVICEEQUIPMENT

NEUTRALSOLIDLY GROUNDED

NOT CLASSIFIED AS A SEPARATELY DERIVED SYSTEM

SEPARATELY DERIVED SYSTEMS250.20(D)

Purpose of Change: This revision clarifies that a separately derived systems shall be grounded where transfer equipment isprovided that includes switching the grounded conductor and where the grounded conductor is not solidly interconnectedto the service supplied grounded conductor.

23Ill.: pg. 2-70NEC: pg. 98

GRAYBOY, Inc. 2007

UTILITYMETER

MAY BE CONNECTEDGROUNDING ELECTRODEHERE 250.24(A)(1) 250.66

GEC SIZED PER 250.66 250.24(D)

LOAD SIDE PANELCONTAINING CBs

SUPPLY SIDE 250.142(A)

GROUNDED(NEUTRAL)CONDUCTOR 250.24(C)(1) 250.24(C)(2) 250.24(D)

TO BRANCH-CIRCUITSOR FEEDER-CIRCUITSWITH PHASE CONDUCTORS 250.142(B)

SERVICEPANELMAIN OCPD

MAY BECONNECTED TO GROUNDINGELECTRODE HERE 250.24(A)(1) 250.66

TO UTILITY XFMR NESC - RULE 92(B)(1)

GROUNDEDCONDUCTOR

GROUNDING ELECTRODE CONDUCTOR250.24(D)

Purpose of Change: This revision clarifies that the grounding electrodeconductors shall be sized in accordance with 250.66.

23Ill.: pg. 2-76NEC: pg. 99

GRAYBOY, Inc. 2007 UNGROUNDED (PHASE) CONDUCTORS 700 KCMIL cu. THWN PARALLELED 3 TIMES

AUXILIARY GUTTER ARTICLE 366

GROUNDING ELECTRODECONDUCTOR MAY BE SPLICED TO BUSBARAND GROUNDED (NEUTRAL)CONDUCTOR

250.64(C), Ex.

UNGROUNDED(PHASE) CONDUCTORS 250 KCMIL 2 cu. BONDING JUMPER 250.64(D) 250.66

GROUNDING ELECTRODECONDUCTOR 3/0 AWG cu. 250.66 TABLE 250.66

PANEL1

PANEL2

PANEL3

PANEL4

PANEL5

PANEL6

MAIN BONDING JUMPER 2 AWG cu. 250.66 TABLE 250.66

NOTE: ONE LINE DRAWN FOR SIMPLICITY

SIZE250.28(D)(1) THRU (D)(3)

Purpose of Change: This revision clarifies how to size main bonding jumpers for services with more than oneenclosure and to size system bonding jumpers for separately derived systems with more than one enlcosure.

24Ill.: pg. 2-78

NEC: pg. 100

GRAYBOY, Inc. 2007

NOTE: THE GEC IS SIZED FROMTABLE 250.66 PER 250.32(E).

BUILDING 2 GROUNDED (NEUTRAL)CONDUCTOR USED ASNEUTRAL AND EGC 250.32(B), Ex.

MAIN SWITCHGEARBUILDING

OCPD 225 A

TO BUILDING

RMC w/RIGIDELBOW

GROUNDED NEUTRAL

PVC

FEEDER W/NEUTRAL 4 AWG cu.

GROUNDED SYSTEMS250.32(B) AND EXCEPTION

EXISTING PREMISES ONLY

Step 1: Calculating neutral load220.61(A); 225.3(B); 310.15(B)(4)(c)50 A x 100% = 50 A

Step 2: Sizing neutral250.32(B), Ex.; Table 310.1650 A requires 8 AWG cu.

Step 3: Sizing neutral to be used as EGC250.32(B), Ex.; Table 250.122225 A OCPD requires 4 AWG cu.

Solution: The grounded neutral conductor must be4 AWG THNN copper to serve as an EGC.

WHAT SIZE NEUTRAL IS REQUIRED?

Purpose of Change: This revision clarifies that the grounded (neutral) conductor for other buildings or structures supplied by feedersor branch circuits shall be permitted to be used as the equipment grounding conductor for existing premises wiring system only.

25Ill.: pg. 2-86

NEC: pg. 102

GRAYBOY, Inc. 2007

NOTE 2: THE EQUIPMENT GROUNDING CONDUCTOR ON THELOAD SIDE OF EACH GENERATOR OVERCURRENT DEVICESHALL BE SIZED IN ACCORDANCE WITH 250.102(D) BASED ONTHE RATING OF THE OVERCURRENT DEVICE SUPPLIED.

NOTE 1: THE EQUIPMENT BONDING JUMPER ON THE SUPPLYSIDE OF EACH GENERATOR OVERCURRENT DEVICE SHALL BESIZED IN ACCORDANCE WITH 250.102(C) BASED ON THE SIZEOF THE CONDUCTORS SUPPLIED BY THE GENERATOR.

SERVICECONDUCTORS

MAKE UP BOX

METER BASESERVICE PANEL

TRANSFER SWITCH GROUNDED CONDUCTOR

SOLIDLY INTERCONNECTEDTO THE SERVICE GROUNDEDCONDUCTOR

250.20(D)

PERMANENTLY INSTALLEDGENERATOR NON- SEPARATELY

DERIVED SYSTEM 250.20(D) 250.30(A)

TO LOAD

TO SEPARATELYDERIVED SYSTEM

TO SERVICEEQUIPMENT

NEUTRAL NOTSOLIDLY GROUNDED

CLASSIFIED AS A SEPARATELY DERIVED SYSTEM

PERMANENTLY INSTALLED GENERATORS250.35(A) AND (B)

Purpose of Change: A new section had been added to address the installation of equipment bondingjumpers and equipment grounding conductors for permanently installed generators that are not separatelyderived systems.

26Ill.: pg. 2-88

NEC: pg. 103

GRAYBOY, Inc. 2007

UNGROUNDED (PHASE) CONDUCTORS 250 KCMIL THWN cu. 230.42(A)(1)

SLAB ANDFOUNDATION

STRUCTURAL STEEL (GES) 250.52(A)(2) TABLE 250.66

GROUND RING 2 AWG cu. 30" (750 mm) DEEP 250.52(A)(4) 250.66(C) 250.53(F)

METAL FRAME OF THE BUILDING OR STRUCTURE250.52(A)(2)

GROUNDINGELECTRODECONDUCTOR 2 AWG cu.

EXOTHERMICWELD

Purpose of Change: This revision clarifies that the structural steel shall be permitted to serve as agrounding electrode if connected to the reinforcing bars of a concrete encased electrode or ground ring.

27Ill.: pg. 2-92

NEC: pg. 105

GRAYBOY, Inc. 2007

C

SERVICE PANELUNGROUNDED (PHASE)CONDUCTORS 250 KCMIL THWN cu. 230.42(A)(1)

OUTSIDEGRADE SLAB

GEC 4 AWG cu. 250.52(A)(3) 250.66(B)

REBAR STEEL AT LEAST20' (6 m) OR MORE IN LENGTH

OR4 AWG COPPER CONDUCTORAT LEAST 20' (6 m) IN LENGTH 250.52(C)(3)

CEE GES 250.52(A)(3)

GEC CONNECTED TO A CONCRETE -ENCASED ELECTRODE (UFERGROUND)

REINFORCINGREBAR INFOOTING

MBJ

GROUNDED (NEUTRAL)CONDUCTOR

EBJ 250.102(C) TABLE 250.122

CONCRETE PILING FORROOF OVERHANG HASREBAR BUT DOESNT REQUIRECONNECTION IF REBAR INBUILDING FOOTING IS USED

CONCRETE-ENCASED ELECTRODE250.52(A)(3)

Purpose of Change: This revision clarifies that it shall be permissible to bond only one concrete-encased electrode(CEE) into the grounding electrode system (GES) where multiple concrete electrodes are present. This change alsopermits the concrete-encased electrode to be located horizontally near the bottom of the footing or vertically wherefoundation or footing is in direct contact with the earth.

28Ill.: pg. 2-94

NEC: pg. 105

GRAYBOY, Inc. 2007

GEC 250.66(A)

FINISHEDGRADE

UNGROUNDED (PHASE)CONDUCTORS 4/0 AWG THWN cu. 230.42(A)(1)

MBJ

DRIVENROD 250.52(A)(5)

EBJ

DRIVEN ROD 5/8" (15.67 mm) STAINLESS STEEL COPPER-COATED STEEL ZINC-COATED STEEL 250.52(A)(5)(b)

LISTED 1/2" DIAMETER STAINLESS STEEL COPPER-COATED STEEL ZINC-COATED STEEL

ROD AND PIPE ELECTRODES250.52(A)(5)

Purpose of Change: This revision clarifies that rod and pipe electrodes can be stainless steel, copper, orzinc-coated steel if at least 5/8 inch in diameter or not smaller than 1/2 inch in diameter if listed.

29Ill.: pg. 2-96

NEC: pg. 105

GRAYBOY, Inc. 2007

BUSBARAUXILIARY GUTTER ARTICLE 366

COMMON GEC W/O SPLICE 3/0 AWG cu. 250.64(D)(1) TABLE 250.66

TAP CONDUCTORS 4/0 AWG THWN cu. 250.64(D)(1) 250.66

TAPPED GECs 2 AWG cu. TABLE 250.66

GE SBS

4 - 600 KCMIL IN PARALLEL PER PHASE THWN cu. CONDUCTORS

FUTURE USE

Given for CGEC:4-600 kcmil in parallel per 310.4

Solution: Table 250.66600 kcmil x 4 = 2400 kcmil3/0 AWG cu. common GEC required.

Given for Tap Conductors:4/0 AWG THWN cu. per phase

Solution: Table 250.664/0 AWG cu.2 AWG GEC taps required.

NOTE: FOR SIMPLICITY, ONLY ONE SET OF THEPARALLEL CONDUCTORS IS SHOWN.

SERVICE WITH MULTIPLE DISCONNECTING MEANS ENCLOSURES250.64(D)(1) THRU (D)(3)

Purpose of Change: This revision clarifies the sizing and installation requirements for the groundingelectrode conductor where multiple disconnecting enclosures are installed.

30Ill.: pg. 2-102NEC: pg. 107

GRAYBOY, Inc. 2007

BOLTED, RIVETED, OR WELDED

SERVICEEQUIPMENT

MECHANICALMEANS NUT AND BOLT 250.68(A), Ex. 2

WHEN CONNECTED TO FIRE-PROOFED STRUCTURALMETAL, THIS CONNECTION IS NOT REQUIRED TO BEACCESSIBLE PER 250.68(A), Ex. 2.

CEE

GEC

ACCESSIBILITY250.68(A), Ex. 2

Purpose of Change: This revision clarifies that the mechanical means, such as a nut and bolt,used to connect irreversible compression connectors to the metal structure is not required to beaccessible.

31Ill.: pg. 2-106NEC: pg. 108

GRAYBOY, Inc. 2007

NOTE 1: THE EGC SHALL BE: CONTINUOUS GREEN COLOR, OR CONTINUOUS GREEN COLOR WITH ONE OR MORE YELLOW STRIPES

EGCCONDUCTORS CONTAINED WITHIN THE SAME

RACEWAY, CABLE, CORD, OR

OTHERWISE RUN WITH THE BRANCH-CIRCUIT CONDUCTORS

NOTE 2: EGCs LARGER THAN 6 AWG cu. ARE NOT REQUIRED TO BEMARKED WHEN IN CONDUIT BODIES THAT CONTAIN NO SPLICES ORUNUSED HUBS PER 250.119(A)(1), EXCEPTION.

CONDUITBODY

IDENTIFICATION SHALL ENCIRCLE THE CONDUCTOR 250.119(A)(2)

CONDUCTORS LARGER THAN 6 AWG250.119(A)

LARGER THAN 6 AWG

Purpose of Change: This revision clarifies that the identification of the equipment groundingconductor (EGC), larger than the 6 AWG, shall encircle the conductor at the termination.

32Ill.: pg. 2-120NEC: pg. 115

GRAYBOY, Inc. 2007

GECGES

GROUNDING 392.7 TABLE 392.7(B)

ASSOCIATEDFITTINGS SHALLBE IDENTIFIED 392.3

BONDING 392.7(B)(4)

MULTIPLE CIRCUITS250.122(C)

NOTE: SINGLE CONDUCTORS USED AS EQUIPMENTGROUNDING CONDUCTORS SHALL BE INSULATED,COVERED, OR BARE, AND THEY SHALL BE 4 AWGOR LARGER.

Purpose of Change: This revision clarifies that where a single equipment groundingconductor is run with multiple circuits in the same cable tray, the equipment groundingconductor must be sized for the largest OCPD protecting conductors in the cable tray andmust meet the minimum requirements in 392.3(B)(1)(c).

33Ill.: pg. 2-121NEC: pg. 116

GRAYBOY, Inc. 2007

EXAMPLE

THE RATING OF THE OCPDPROTECTING THE CIRCUITCONDUCTORS IS 20 AMPS.

SIZING EBJTABLE 250.12220 A REQUIRES 12 AWG cu.

NEUTRAL

EBJ 250.146

HOT

SWITCH BOX METAL

CONNECTING RECEPTACLE GROUNDINGTERMINAL TO BOX

250.146

Purpose of Change: This revision clarifies that the sizing of the equipment bondingjumper (EBJ) from the box to the receptacle is based on Table 250.122 for the ratingof the branch circuit overcurrent protective device.

34Ill.: pg. 2-124NEC: pg. 119

GRAYBOY, Inc. 2007NOTE: RIGID METAL CONDUIT AND INTERMEDIATE METAL CONDUITSHALL NOT BE REQUIRED TO COMPLY WITH 300.4(E).

ROOF DECKING METAL-CORRUGATED

CABLES ROUTED ALONG SIDE OFRAFTERS NOT LESS THAN 1 1/2"(38 mm) FROM THE ROOF DECKING. 300.4(E)

CABLES RUN ACROSS RAFTERS WITHGUARD STRIPS NOT LESS THAN 1 1/2"(38 mm) FROM THE NEARESTSURFACE OF THE ROOF DECKING.

CABLES ROUTED ALONGSIDE OF JOISTS

CABLES ROUTED ACROSSTOP OF JOISTS WITHGUARD STRIPS USED FORSUPPORTS

CABLES ROUTED NOT LESS THAN1 1/2" (38 mm) THROUGH JOISTS WITHRUNNING BOARD

CABLES AND RACEWAY INSTALLEDUNDER ROOF DECKING

300.4(E)

Purpose of Change: A new subsection has been added to required at least 1 1/2 in. clearance for a cable- or raceway-typewiring method to be installed in exposed or concealed locations under metal-corrugated sheet roof decking.

35Ill.: pg. 3-2

NEC: pg. 128

GRAYBOY, Inc. 2007

SECABLE

PANELBOARD 408.16(A), Ex. 1

HANDHOLE ENCLOSURE INTERIOR CONSIDERED

A WET LOCATION 300.5(B)

HANDHOLE ENCLOSURE 314.30(A) - (D)

RACEWAY INTERIOR CONSIDERED A WET LOCATION 300.9

RACEWAY INTERIOR CONSIDERED

A WET LOCATION 300.5(B)

INSULATED CONDUCTORSAND CABLES LISTED FOR USE IN

WET LOCATIONS 300.5(B) 300.9

RACEWAYS IN WET LOCATIONS ABOVE GRADE300.9

Purpose of Change: A new section has been added to clarify that the interior of enclosures or racewaysshall be considered to be a wet location if installed in wet locations above grade. All insulated conductorsand cables shall be listed for use in wet locations.

36Ill.: pg. 3-8

NEC: pg. 131

GRAYBOY, Inc. 2007

Purpose of Change: A new exception has been added to clarify that raceways and cables shall not berequired to be mechanically secured to the equipment where installed into the bottom of open bottomequipment.

MECHANICAL CONTINUITY - RACEWAYS AND CABLES300.12, Ex. 2

8" 10"

RACEWAYS

FITTINGS

3" (75 mm)OR LESS TABLE 408.5

BUSBAR INSULATED TABLE 408.5

BUSBAR NONINSULATED TABLE 408.5

CLEARANCE 8" (200 mm) TABLE 408.5

CLEARANCE 10" (250 mm) TABLE 408.5

OPENBOTTOM

FLOOR STANDING SWITCHBOARDS, PANELBOARDS,OR SIMILAR ENCLOSURES

RACEWAYS OR CABLES NOT REQUIRED TO BE MECHANICALLY

SECURED TO THE EQUIPMENT 300.12, Ex. 2

37Ill.: pg. 3-9

NEC: pg. 132

GRAYBOY, Inc. 2007

GRADE

MIN.BURIALDEPTHS

30" (750 mm) FOR OVER 600 V TO 22 kV CIRCUITS36" (900 mm) FOR OVER 22 kV TO 40 kV CIRCUITS42" (1000 mm) FOR CIRCUITS OVER 40 kV

WARNING RIBBON

12" (300 mm)MINIMUM

30" (750 mm) TOP OF CONDUIT

MINIMUM COVERa REQUIREMENTSTABLE 300.50d

Purpose of Change: A new superscript d has been added to Table 300.50 to require direct-buried cables that are notconcrete-encased, protected by concrete or sleeved with proper protection and are buried at least 30 in. (750 mm) ormore below grade must have location identified by warning ribbon that is installed in the trench at least 12 in. (300mm) above the cables.

38Ill.: pg. 3-13

NEC: pg. 137

GRAYBOY, Inc. 2007

NOTE: FEDERAL AVIATION ADMINISTRATION(FAD) ADVISORY CIRCULARS (ACS) PROVIDEADDITIONAL PRACTICES AND METHODS FORAIRPORT LIGHTING.

AIRFIELD LIGHTING SERIES CIRCUITS 310.7, Ex. 2 AND FPN TO Ex. 2

5 kV SHIELDED CABLE POWERED BY REGULATORS 310.7, Ex. 2 AND FPN TO Ex. NO. 2

DIRECT BURIAL CONDUCTORS310.7, Exception No. 2 AND FPN TO EXCEPTION NO. 2

Purpose of Change: A new exception and FPN has been added to clarify that ungrounded airfieldlighting series circuits may be unshielded where rated up to 5000 volts and powered by regulators.

39Ill.: pg. 3-14

NEC: pg. 139

GRAYBOY, Inc. 2007

CB

ORSWITCH

ROOF

EMT ON ROOF 100 F

DISCONNECTING MEANS W/UNIT 440.14

CONDUCTORS 10 THWN cu.

DISTANCE ABOVEROOF TO BOTTOMOF CONDUIT 3" OUTSIDE AMBIENT 100F ADDED TEMPERATURE OF 40F

TO 100F = 140F FOR RACEWAY

WHAT IS THE AMPACITY OF THE 10 AWG THWN COPPERCONDUCTOR?

FINDING AMPACITY OF CONDUCTOR

STEP 1: FINDING A OF CONDUCTOR110.14(C); TABLE 310.1610 AWG THWN = 35 A

STEP 2: FINDING DERATING FACTORTABLE 310.16; TABLE 310.15(B)(2)(c)OUTSIDE TEMPERATURE = 100 FDISTANCE ABOVE ROOF (3") = 40 FTOTAL = 140 F

140 F REQUIRES 58%

STEP 3: CALCULATING AMPERE VALUE OF CONDUCTOR35 A x 58% = 20.3 A

SOLUTION: THE 10 AWG THWN COPPER CONDUCTORIS LIMITED TO 20.3 AMPS.

CONDUITS EXPOSED TO SUNLIGHT ON ROOFTOPS310.15(B)(2)(c)

Purpose of Change: A new subdivision has been added to require an additional ambient temperature to be applied forconduits exposed to sunlight on rooftops.

40Ill.: pg. 3-16

NEC: pg. 146

GRAYBOY, Inc. 2007

120/240 VOLTS, 3-WIRE, SINGLE-PHASEDWELLING SERVICES AND FEEDERS

310.15(B)(6)

FEEDER CONDUCTORS SUPPLYING LIGHTING ANDAPPLIANCE BRANCH-CIRCUIT PANELBOARD INSIDEOF DWELLING UNIT COMPLY 4 AWG THWN cu. (PHASES) 8 AWG THWN cu. (NEUTRAL) TABLE 310.15(B)(6) 310.15(B)(6)

SERVICE-ENTRANCECONDUCTORS 400 KCMIL THWN cu.

INDIVIDUAL DWELLING UNITS IN AMULTIFAMILY DWELLING COMPLEX 310.15(B)(6)

MAIN FEEDER-CIRCUITTO EACH APARTMENT 310.15(B)(6)

LOAD IN EACH APARTMENT 90 A PER PHASE

(PHASE-TO-PHASE PLUS NEUTRAL) 40 A PER NEUTRAL REQUIRES 100 AMP SERVICE TABLE 310.15(B)(6)

Purpose of Change: This revision clarifies that the main power feeder can be the feeder(s) between themain disconnect and the panelboards (Loads associated with the dwelling unit).

41Ill.: pg. 3-20

NEC: pg. 147

GRAYBOY, Inc. 2007

DEVICE BOX

COIL OR LOOP OF CONDUCTORSMUST BE COUNTED TWICE 314.16(B)(1)

NOTE: THE CALCULATION PROCEDURE IS WHERE A LOOP ORCOIL IS TWICE THE MINIMUM LENGTH REQUIRED FOR FREECONDUCTORS PER 300.14 AND SHALL BE COUNTED TWICE.

CONDUCTOR FILL314.16(B)(1)

Purpose of Change: This revision clarifies that each loop or coil of conductors shall be counted twice.

42Ill.: pg. 3-24

NEC: pg. 168

GRAYBOY, Inc. 2007

20 A CBs

MAIN

DIRECTORY 110.22 230.70(B) 408.4

2 GANG = 4 CONDUCTOR ALLOWANCE

6 AWG cu. CONDUCTORS4 x 5.00 in.3 = 20 in.3 FOR DEVICE PLUSCONDUCTOR ALLOWANCE FOR EACHCONDUCTOR IN BOX

DEVICE OR EQUIPMENT FILL314.16(B)(4)

Purpose of Change: This revision clarifies that a device or utilization equipment wider than a single (2 in.)device box shall have double volume allowance provided for each gang.

43Ill.: pg. 3-26

NEC: pg. 168

GRAYBOY, Inc. 2007

CONDUCTORS LARGER THAN 4 AWG BOXES SHALL BE IDENTIFIED FOR

THEIR SPECIFIC FUNCTION 314.24(C)(2)CONDUCTORS 8, 6, OR 4 AWG BOXES SHALL HAVE AN INTERNAL

DEPTH THAT IS NOT LESS THAN2 1/16" (52.4 mm)

314.24(C)(3)

CONDUCTORS 12 OR 10 AWG BOXES SHALL HAVE AN INTERNAL

DEPTH THAT IS NOT LESS THAN1 3/16" (30.2 mm)

WHERE THE EQUIPMENT PROJECTS REARWARDFROM THE MOUNTNG PLANE OF THE BOX BYMORE THAN 1" (25 mm), THE BOX SHALL HAVEA DEPTH NOT LESS THAN THAT OF THE EQUIPMENTPLUS 1/4" (6 mm)

314.24(C)(4)CONDUCTORS 14 AWG AND SMALLER BOXES SHALL HAVE A DEPTH THAT IS NOT LESS

THAN 15/16" (23.8 mm) 314.24(C)(5)

F I R E

DEPTH OF BOX SHALL NOT BE LESS

THAN THE DEPTH OFTHE EQUIPMENT PLUS 1/4" (6 mm)

314.24(C)(1)MOUNTINGPLATE

DEPTH PROJECTS MORE THAN

1 7/8" REARWARD FROMTHE MOUNTING PLATE

314.24(C)(1)

MINIMUM DEPTH OF BOXES FOR OUTLETS, DEVICES,AND UTILIZATION EQUIPMENT

314.24(A) THRU (C)

Purpose of Change: The rewrite provides requirements for the installation of large switches, receptacles, andutilization equipment into outlet and device boxes.

44Ill.: pg. 3-28

NEC: pg. 172

GRAYBOY, Inc. 2007

BRANCH CIRCUITSPECIAL LISTED OUTLETBOX CAN SUPPORT ALUMINAIRE WEIGHING MORETHAN 50 LBS. (23 kg) LISTED AND MARKED FOR THE

MAXIMUM WEIGHT TO BESUPPORTED

LISTED BOX SUPPORTINGLUMINAIRE MINIMUM50 LBS. (23 kg) 314.27(A)

CEILING CHANDELIER

LAMPS

BOXES AT LUMINAIRE OUTLETS314.27(A) AND (B)

Purpose of Change: This revision clarifies the requirements for listed boxes used for luminaire support.

45Ill.: pg. 3-30

NEC: pg. 172

GRAYBOY, Inc. 2007

NOTE: UTILIZATION EQUIPMENT HEAVIER THAN 50 LBS. SHALL BESUPPORTED INDEPENDENT OF THE OULET BOX, UNLESS LISTEDFOR GREATER WEIGHT.

OUTLET BOX SUPPORT OF UTILIZATION EQUIPMENT MEETS

314.27(A) AND (B) REQUIREMENTS OTHER THAN CEILING-SUSPENDED (PADDLE) FANS 314.27(E)

UTILIZATION EQUIPMENT 50 LBS OR LESS MOUNTED TO OUTLET BOXES, NOT DEVICE BOXES

OULET BOX NOT WEIGHING

MORE THAN 6 LBS (3 kg) AT LEAST 2 - #6 OR

LARGER SCREWS 314.27(E), Ex.

UTILIZATION EQUIPMENT314.27(E) AND Ex.

Purpose of Change: A new subsection and exception have been added to address the installation requirements forutilization equipment used with outlet boxes.

46Ill.: pg. 3-32

NEC: pg. 173

GRAYBOY, Inc. 2007

LUMINAIRE 210.70(C)

SWITCH 210.70(C)

NM CABLE RUN THROUGH BORED

HOLES OR ON RUNNING BOARDS 334.15(C)

CRAWL SPACEENTRANCE 210.70(C)

HVAC EQUIPMENT

CRAWL SPACE

ATTIC 210.70(C)

IN UNFINISHED BASEMENTS AND CRAWL SPACES334.15(C)

Purpose of Change: This revision clarifies that NM cable shall be protected in crawl spaces.

47Ill.: pg. 3-44

NEC: pg. 186

GRAYBOY, Inc. 2007

CORD-AND-PLUGCONNECTEDAPPLIANCES 210.8(A)(5), Ex. 1

BASEMENT ORCRAWL SPACE UNFINISHED

LIGHTING OUTLET 210.70(A)

NM CABLE (SECURED) WITHIN 12" (300 mm)

OF THE POINT WHERETHE CABLE ENTERSTHE TUBING OR CONDUIT

334.15(C)

EMT(SUPPORTED) NM CABLE SHEATH

SHALL EXTEND THROUGH CONDUIT OR TUBINGINTO THE OUTLET OR DEVICE BOX NOT LESSTHAN 1/4" (6 mm)

334.15(C)

NOTE: METAL CONDUIT, TUBING, AND METALOUTLET BOXES SHALL BE CONNECTED TO ANEQUIPMENT GROUNDING CONDUCTOR.

IN UNFINISHED BASEMENT AND CRAWL SPACES334.15(C)

Purpose of Change: This revision clarifies the installation requirements for NM cable in an unfinishedbasement or crawl space where the NM cable is installed in a conduit or tubing for protection.

48Ill.: pg. 3-46

NEC: pg. 186

GRAYBOY, Inc. 2007

WOOD FRAMING IS FIRE- ORDRAFT-STOPPED USING THERMALINSULATION, CAULK, OR SEALINGFOAM PER 334.80.

CABLES

CABLES WITH CURRENT-CARRYING CONDUCTORSARE INSTALLED, WITHOUTMAINTAINING SPACINGBETWEEN CABLES 334.80

CONDUCTORS TABLE 310.15(A)(2)(a)

EACH CABLE HAS TWO OR MORECURRENT-CARRYING CONDUCTORS 334.80

APPLY THE ADJUSTMENTFACTORS FOR EACH CONDUCTOR 310.15(B)(2)(a)

NOTE: THE PROVISIONS OF310.15(A)(2), Ex. DOES NOTAPPLY.

AMPACITY334.80

Purpose of Change: This revision clarifies that where more than two NM cables containing two or more current-carryingconductors are installed, without maintaining spacing between cables, the provisions of 310.12(A)(2), Ex. shall not apply.The term bundled has been deleted since the use of bundled caused a lot of controversy as to what constitutedbundled conductors. The term caulk was added since it is a common method of fire or draft stopping.

49Ill.: pg. 3-48

NEC: pg. 187

GRAYBOY, Inc. 2007

NOTE: IMC SHALL BE PERMITTED TO BE UNSUPPORTED WHERE THERACEWAY IS NOT MORE THAN 18 IN. (450 mm) IN LENGTH ANDREMAINS IN UNBROKEN LENGTHS (WITHOUT A COUPLING).

DEVICE (RECEPTACLE) 314.23 342.30(C)

THREADED HUB ORTHREADED ENCLOSURE 314.23

H

N

METER

SERVICEEQUIPMENT 230.70(A) - (C)

THREADED HUB ORTHREADED ENCLOSURE 314.23

SERVICE-ENTRANCECONDUCTORS

18" (450 mm)OR

LESS

UNSUPPORTED RACEWAYS342.30(C)

Purpose of Change: A new subsection has been added to permit IMC to be unsupported where the raceway isnot more than 18 in. (450 mm) in length and remains in unbroken lengths (without a coupling), where oversized,concentric or eccentric knockouts are not encountered.

50Ill.: pg. 3-57

NEC: pg. 192

GRAYBOY, Inc. 2007

CINDER FILL GALVANIZED STEEL,

STAINLESS STEEL, ANDRED BRASS RMC

ATMOSPHERIC CONDITIONS AND OCCUPANCIES ALL GALVANIZED STEEL AND STAINLESS STEEL RMC RED BRASS RMC FOR DIRECT BURIAL AND SWIMMING

POOL APPLICATIONS ALUMINUM RMC WHERE JUDGED SUITABLE FOR THE

ENVIRONMENT 344.10(A)(1) - (A)(4)

CORROSIVE ENVIRONMENTS GALVANIZED STEEL, STAINLESS STEEL, AND RED BRASS

RMC, ELBOWS, COUPLINGS, AND FITTINGS SHALL BEPERMITTED TO BE INSTALLED IN CONCRETE, IN DIRECTCONTACT WITH THE EARTH, OR IN AREAS SUBJECT TOCORROSIVE INFLUENCES WHERE PROTECTED BYCORROSION PROTECTION AND JUDGED SUITABLE FORTHE CONDITION

ALUMINUM RMC SHALL BE PROVIDED WITH APPROVEDSUPPLEMENTARY CORROSION PROTECTION

344.10(B)(1); (B)(2)

USES PERMITTED344.10(A) THRU (C)

Purpose of Change: This revision clarifies the uses permitted for galvanized, stainless, red brass,and aluminum RMC and the requirements for additional corrosion protection where necessary.

51Ill.: pg. 3-59

NEC: pg. 193

GRAYBOY, Inc. 2007

BRICKFMC NOT PERMITTED INSTALLED IN

WET LOCATION

SUPPORTS RECEPTACLEBOX

USES NOT PERMITTED348.12(1)(1)

Purpose of Change: This revision clarifies that FMC shall not be permitted to be installed in any wet locations.

52Ill.: pg. 3-63

NEC: pg. 195

GRAYBOY, Inc. 2007

Purpose of Change: A new article has been added for reinforced thermosetting resin conduit (Type RTRC).

REINFORCED THERMOSETTINGRESIN CONDUIT: TYPE RTRC

ARTICLE 355

TYPE RTRC CONDUIT WITH ASSORTEDFITTINGS PER ARTICLE 355

LISTING REQUIREMENTS 355.6

USES PERMITTED 355.10

SIZE 355.20

NUMBER OF CONDUCTORS 355.22

CONSTRUCTION 355.100

NUMBER OF BENDS 355.26

JOINTS 355.48

SPLICES AND TAPS 355.56

MARKING 355.120

GROUNDING 355.60

THIS NEW ARTICLE IS DIVIDED INTO THREE PARTS:

PART I GENERALPART II INSTALLATIONPART III CONSTRUCTION SPECIFICATIONS

USES NOT PERMITTED 355.12

53Ill.: pg. 3-76

NEC: pg. 203

GRAYBOY, Inc. 2007

COVERS SECURELY FASTENED 376.100(D)

SMOOTHLY ROUNDED EDGES SUITABLE BUSHINGS SHIELDS FITTINGS HAVING SMOOTH

ROUNDED EDGES 376.100(C)

ELECTRICAL ANDMECHANICALCONTINUITY 376.100(A)

SUBSTANTIALCONSTRUCTION A COMPLETE ENCLOSURE SUITABLY PROTECTED

FROM CORROSION CORNER JOINTS SHALL

BE MADE TIGHT 376.100(B)

CONSTRUCTION376.100(A) THRU (D)

Purpose of Change: A new section has been added for the construction requirements of a wireway.

54Ill.: pg. 3-92

NEC: pg. 220

GRAYBOY, Inc. 2007NOTE: CONCEALABLE NONMETALLIC EXTENSIONS AND ASSOCIATED FITTINGS AND DEVICES SHALL BE LISTED.

OUTER INSULATOR GROUNDING CONDUCTOR G1

INSULATOR GROUNDED (NEUTRAL) CONDUCTOR H1

INSULATOR UNGROUNDED (PHASE) CONDUCTOR H

INSULATOR GROUNDED (NEUTRAL) CONDUCTOR N2

OUTER INSULATOR GROUNDING CONDUCTOR G2

CONCEALABLE NONMETALLIC EXTENSION

PROTECTIVE LAYERED FLATWIRE

STARTING/SOURCE TAP DEVICE SUPPLEMENTARY OVERCURRENT PROTECTION GFCI-PROTECTION MISWIRE PROTECTION ARC IGNITION PROTECTION 382.6

LOADSIDE EXTENSIONSAND DEVICES 382.6

LISTING REQUIREMENTS382.6

Purpose of Change: New sections have been added to address the listing requirements for concealablenonmetallic extensions and associated fittings and devices.

55Ill.: pg. 3-94

NEC: pg. 223

GRAYBOY, Inc. 2007

Purpose of Change: A new subsection has been added to address the installationrequirements for multipole snap switches.

MULTIPOLE SNAP SWITCHES404.8(C)

MULTIPOLE SNAP SWITCH LISTED MARKED AS TWO-CIRCUIT

OR THREE-CIRCUIT SWITCH404.8(C)

SUPPLIED BY MORETHAN ONE CIRCUIT 404.8(C)

NOTE 2: WHERE USING TWO CIRCUITS ON A SINGLE MULTIPOLE SWITCH,COMPLIANCE WITH 210.7(B) IS NECESSARY.

NOTE 1: MULTIPOLE SNAP SWITCHES SHALL ALSO BE PERMITTED IN THISTYPE OF APPLICATION WHERE THE RATING IS NOT LESS THAN THE NOMINALLINE-TO-LINE VOLTAGE OF THE SYSTEM SUPPLYING THE CIRCUITS.

56Ill.: pg. 4-6

NEC: pg. 256

GRAYBOY, Inc. 2007

NOTE: ENCLOSURE IS EQUIPPED WITH IDENTIFIED, SECURELY INSTALLEDBARRIERS BETWEEN ADJACENT DEVICES.

BARRIER 406.4(G) 404.8(B)

120 VOLTRECEPTACLE 406.4(G)

SWITCHES 404.8(B)

480 V

VOLTAGE BETWEEN ADJACENT DEVICES406.4(G)

BARRIER 404.8(B)

277 VOLTPHASE A

277 VOLTPHASE B

120-VOLTCIRCUIT

Purpose of Change: A new subsection has been added to address the hazard for receptacles, switches,and other devices where the voltage exceeds 300 volts between adjacent devices.

57Ill.: pg. 4-10

NEC: pg. 260

GRAYBOY, Inc. 2007

TYPES OF RECEPTACLE

5-15 5-20 6-15 6-20

SEE ANSI/NEMAWD 6-2002

TYPICAL DAMPLOCATION

TYPICAL WETLOCATION

DAMP LOCATIONS406.8(A)

NONLOCKINGRECEPTACLES LISTED WEATHER-

RESISTANT TYPE 406.8(A)

ALL NONLOCKINGRECEPTACLES LISTEDWEATHER-RESISTANTTYPE

Purpose of Change: This revision provides requirements that all nonlocking 15- and 20-ampere, 125- and250-volt receptacles must be a listed weather-resistant type.

58Ill.: pg. 4-12

NEC: pg. 260

GRAYBOY, Inc. 2007

RECEPTACLE WEATHERPROOF

ENCLOSURE 406.8(B)(1), Ex.

15- AND 20-AMPERE, 125- THROUGH 250-VOLTRECEPTACLES IN A WET LOCATION

406.8(B)(1), Ex.

Purpose of Change: A new exception has been added to permit receptacles installed in wetlocations subject to high pressure spray washing to have an enclosure that is weatherproofwhen the attachment plug is removed.

59Ill.: pg. 4-14

NEC: pg. 261

GRAYBOY, Inc. 2007

TAMPER-RESISTANT RECEPTACLE LOCATIONS

KITCHEN BATHROOMS FAMILY ROOM OUTDOORS LIVING ROOM LAUNDRY PARLOR BASEMENTS LIBRARY GARAGES DEN HALLWAYS SUNROOM BEDROOMS RECREATION ROOM

SINK

OVE

N

REF.SPACE

ISLAND

KITCHEN

PANTRYDINING ROOM

BREAKFAST ROOM

GFCI

DW

RECEPTACLES TAMPER-RESISTANT

TAMPER-RESISTANT RECEPTACLES IN DWELLING UNITS406.11

Purpose of Change: A new section has been added to require tamper-resistant receptacles in dwellingunits for locations specified in 210.52.

60Ill.: pg. 4-16

NEC: pg. 261

GRAYBOY, Inc. 2007

WEATHERHEAD 230.54

SERVICE DROP 230.23

POINT OFATTACHMENT 230.26 UTILITY

TRANSFORMER 3 = 240 V/120 V

HIGH LEG HIGH LEG =

208 V TO GROUND

SERVICE EQUIPMENT 230.70(A) - (C)

METER BASE 90.2(B)(5)

HIGH-LEG COLORED ORANGE OR OTHER SUITABLE MEANS

HIGH-LEG (HL) IS PHASE B THE CENTER LEG LEGIBLY AND PERMANENTLY

FIELD-MARKED CAUTION ___ PHASE HAS ___

VOLTS TO GROUND 408.3(F) 230.66

230.56 215.8 408.3(E)

HIGH-LEG B-PHASE

HIGH-LEG B-PHASE

HIGH-LEG IN PANEL B-PHASE ORANGE

NEC LOOP

HIGH-LEG IDENTIFICATION408.3(F)

HIGH-LEG (HL) IS PHASE CIN SELF-CONTAINEDMETER BASE

Purpose of Change: A new subsection has been added to require the high-leg to be legibly and permanentlyfield-marked in the switchboard or panelboard.

61Ill.: pg. 4-18

NEC: pg. 262

GRAYBOY, Inc. 2007

INDIVIDUAL PROTECTIONNOT REQUIRED PROTECTED ON ITS

SUPPLY SIDE 408.36, Ex. 2

OCPD PANELBOARD MORE THAN

42 OCPDs 408.36, Ex. 2

CB COUNTINGPROCEDURE

SP COUNTS AS 1DP COUNTS AS 23P COUNTS AS 3

SINGLE MAIN DISCONNECTIN ONE ENCLOSURE 230.71(A) 408.36

PANELS WITH MAINCBs

TWO TO SIX DISCONNECTSIN SINGLE OR SEPARATE ENCLOSURES 408.36, EX. 1 230.71(A)GROUPING 230.72(A)

PANEL WITH MAIN CBFUSED DISCONNECT

OVERCURRENT PROTECTION408.36, Ex. 1 AND Ex. 2

NOT LIMITED TO 42 CIRCUITS

Purpose of Change: This revision clarifies the permitted methods for providing protection of a panelboardand deletes the definition of power panelboards and lighting and appliance branch circuit panelboards.

62Ill.: pg. 4-22

NEC: pg. 263

GRAYBOY, Inc. 2007

SP COUNTS AS 1DP COUNTS AS 23P COUNTS AS 3

CB COUNTINGPROCEDURE

15 A 20 A

15 A 20 A

15 A

15 A 20 A

20 A

2PCB

SPCB

DPCB

PANELBOARD DESIGNED, RATED, AND LISTED FOR

THE MAXIMUM NUMBER OFOVERCURRENT DEVICES

408.54

MAXIMUM NUMBER OF OVERCURRENT DEVICES408.54

Purpose of Change: The maximum number of overcurrent devices that a panel was designed, rated,and listed to contain has been relocated to Part IV dealing with construction of panelboards.

63Ill.: pg. 4-25

NEC: pg. 264

GRAYBOY, Inc. 2007

NOTE 2: LUMINAIRES LOCATED IN THIS ACTUAL DIMENSIONOF TUB OR SHOWER AND WITHIN 8 FEET SHALL BE MARKEDFOR DAMP OR MARKED FOR WET LOCATIONS WHERE SUB-JECT TO SHOWER SPRAY.

NOTE 1: NO CORD, CHAIN, OR CABLE TYPE LUMINAIRESSHALL BE INSTALLED PER 410.10(D).

BATHTUB

VERTICAL

LUMINAIRE

8' (2.5 m)

VERTICAL ACTUAL OUTSIDE DIMENSION

OF THE BATHTUB OR SHOWER 410.10(D)

MUST BE MARKEDDAMP OR WET

BATH AND SHOWER AREAS410.10(D)

Purpose of Change: This revision clarifies that the luminaires located within the actual outside dimension of thebathtub or shower to a height of 8 ft. (2.5 m) vertically from the top of the bathtub rim or shower threshold to bemarked damp or if subject to shower spray, marked wet location.

64Ill.: pg. 4-32

NEC: pg. 268

GRAYBOY, Inc. 2007

RECESSEDINCANDESCENT,

FLUORESCENT, OR LEDLUMINAIRES

12" MIN

6" MIN

SOLIDLENS

24"

NEC 410.8(D)(3); (4)ST

OR

AGE

AREA

SURFACE-MOUNTEDINCANDESCENT OR

LED LUMINAIRES

SURFACE-MOUNTEDFLUORESCENT

LUMINAIRES

12" MIN 12" MIN

SHELF

24" 24"

SHELF12" MIN 6" MIN

NEC 410.8(D)(1) NEC 410.8(D)(2)

ENCLOSEDTYPE

STO

RAG

EAR

EA

UN

OBS

TRU

CTE

DTO

FLO

OR

STO

RAG

EAR

EA

SURFACE-MOUNTEDFLUORESCENT OR LED

LUMINAIRES

NEC 410.8(D)(5)

STO

RAG

EAR

EA

SHELF

IDENTIFIEDFOR THIS USE

LUMINAIRES IN CLOTHES CLOSETS410.16(D)(1) THRU (D)(5)

CLOTHING RODSURFACE-MOUNTEDFLUORESCENTIDENTIFIED FORTHIS USE

Purpose of Change: This revision clarifies the installation requirements for surface-mounted incandescent,fluorescent, or LED luminaires, and surface-mounted fluorescent or LED luminaires identified for the use whereinstalled within the storage space.

65Ill.: pg. 4-34

NEC: pg. 269

GRAYBOY, Inc. 2007

INCANDESCENTLIGHTS 410.130(G)

DOESNT APPLY

FLUORESCENTLIGHTS

MULTIWIRE BRANCH CIRCUITS 410.130(G)

LOCKOUT/TAGOUTOF SWITCH NFPA 70E

PERSONNEL REPLACINGDEFECTIVE BALLAST 410.130(G), Ex. 5

DISCONNECTING MEANS EXTERNAL TO LUMINAIRE SHALL BE A SINGLE DEVICE LOCATED IN SIGHT OF LUMINAIRE SHALL SIMULTANEOUSLY BREAK ALL THE

SUPPLY CONDUCTORS OF THE BALLAST,INCLUDING THE GROUNDED (NEUTRAL) CONDUCTOR

410.130(G)

BALLAST

DISCONNECTING MEANS410.130(G)

Purpose of Change: This revision clarifies that the disconnecting means for multiwire branch circuits shallsimultaneously break all the supply conductors of the ballast, including the grounded (neutral) conductor.

66Ill.: pg. 4-40

NEC: pg. 275

GRAYBOY, Inc. 2007

NOTE: THE LUMINAIRES, POWER SUPPLY,AND LUMINAIRE FITTINGS (INCLUDINGTHE EXPOSED BARE CONDUCTORS) OFAN EXPOSED BARE CONDUCTOR LIGHT-ING SYSTEM SHALL BE LISTED FOR THEUSE AS PART OF THE SAME IDENTIFIEDLIGHTING SYSTEM.

ASSEMBLY OF LISTED PARTS

LOW VOLTAGE LUMINAIRES LOW VOLTAGE LUMINAIRE POWER SUPPLY CLASS 2 POWER SUPPLY LOW VOLTAGE LUMINAIRE FITTINGS CORD (SECONDARY CIRCUIT) THAT THE LUMINAIRES AND POWER SUPPLY

ARE LISTED FOR USE WITH CABLE, CONDUCTORS IN CONDUIT, OR OTHER FIXED WIRING METHOD FOR

THE SECONDARY CIRCUIT

LIGHTING SYSTEMS RATED AT 30 VOLTS OR LESSSHALL BE LISTED AS A COMPLETE SYSTEM. 411.3BRANCH-CIRCUIT SHALLBE 20 A OR LESS

210.19(A) 210.20(A) 411.6

PRIMARY SECONDARY SEC. CIRCUITS 411.2

ISOLATINGTRANSFORMER 411.3

LAMPSONE OR MORESECONDARYCIRCUITS

ISOLATEDPOWERSUPPLY 30 V OR LESS 411.3

411.3 110.3(B) 90.7 ARTICLE 100

LOAD OF SECONDARY CIRCUIT 25 A OR LESS 411.2

NEC LOOP

LISTING REQUIRED411.3(A); (B)

Purpose of Change: This revision clarifies that the various types of lighting systems operating at 30 volts or less are either alisted low voltage lighting system or a lighting system assembled from listed parts.

67Ill.: pg. 4-46

NEC: pg. 278

GRAYBOY, Inc. 2007

OLDER VENDING MACHINE MANUFACTURED OR REMANUFACTURED

PRIOR TO JANUARY 1, 2005 SHALL BE CONNECTED TO GFCI-PROTECTED OUTLET 422.51

VENDING MACHINE SELF-SERVICE DEVICE THAT DISPENSES

PRODUCTS OR MERCHANDISE WITHOUT THENECESSITY OF REPLENISHING THE DEVICEBETWEEN EACH VENDING OPERATION

DESIGNED TO REQUIRE INSERTION OF ACOIN, PAPER CURRENCY, TOKEN, CARD,KEY, OR RECEIPT OF PAYMENT BYOTHER MEANS

422.51

CORD-AND-PLUG CONNECTED VENDING MACHINES422.51

Purpose of Change: This revision clarifies that older vending machines manufactured or remanufacturedbefore January 1, 2005, must be connected to a GFCI-protected outlet.

68Ill.: pg. 4-52

NEC: pg. 283

GRAYBOY, Inc. 2007

Step 1: Finding FLA430.6(A)(1); Table 430.25050 HP = 65 A

Step 2: Finding percentage430.52(C)(1), Ex. 2(c); Table 430.52Max. size = 400%

Step 3: Calculating max. size430.52(C)(1), Ex. 2(c)Max. size = 65 A x 400% = 260 A

Step 5: Selecting inverse time circuit breaker240.6(A)Max. size = 250 A

Solution: The maximum size inverse time circuitbreaker is 250 amps.

INVERSE TIME CIRCUIT BREAKER

INVERSE TIMECIRCUIT BREAKER 430.52(C)(1), Ex. 2(c)

OLs 430.32(A)(1) 430.32(C) 430.35

CB 430.52(C)(1) TABLE 430.52 240.4(G) 240.6(A)

NONFUSEDDISCONNECT 430.110(A)

50 HP MOTOR3, 460 VDESIGN B

NAMEPLATE 62 A

ORGEC

GES

MBJ

IN ACCORDANCE WITH TABLE 430.52430.52(C)(1), Ex. 2

Purpose of Change: This revision clarifies that where the rating specified in Table 430.52 or the ratings modified by ExceptionNo. 1 is not sufficient for the starting current of the motor, the Exception No. 2 shall be permitted to be applied.

69Ill.: pg. 4-61

NEC: pg. 310

GRAYBOY, Inc. 2007

ALTERNATEPOWER SOURCE

SWITCHBOARD SEPARATE VERTICAL

SECTIONS 700.9(B)(5)(a)

SERVICEEQUIPMENT

NORMALPOWERSOURCE

GENERATOR 445.19(1)

TRANSFEREQUIPMENT

EMERGENCY NORMALLEGALLYREQUIREDSTANDBY

70Ill.: pg. 4-82

NEC: pg. 335

GRAYBOY, Inc. 2007

ALTERNATEPOWER SOURCE WIREWAY

SERVICEEQUIPMENT

NORMALPOWERSOURCE

GENERATOR 445.19(2)

TRANSFEREQUIPMENT

EMERGENCY NORMALLEGALLYREQUIREDSTANDBY

SEPARATE ENCLOSURES 700.9(B)(5)(b)

GENERATORS SUPPLYING MULTIPLE LOADS445.19

Purpose of Change: A new section has been added to provide requirements for a single generatorsupplying more than one load or multiple generators operating in parallel.

70.2Ill.: pg. 4-82

NEC: pg. 335

GRAYBOY, Inc. 2007

FACILITY SITE HAS RESTRICTED PUBLIC ACCESS.

QUALIFIED PEOPLESERVICE EQUIPMENT

FACTORY ELBOWAND MARKED WITH - XWASSOCIATED FITTINGS

SUPERVISIONON SITE

ENCLOSURE #2 FACTORY SEALED

CLASS 1, DIVISION 2INDUSTRIALESTABLISHMENT

FACTORY SEALEDENCLOSURE #1

RTRC WITH FACTORY ELBOWSAND ASSOCIATED FITTINGSMARKED WITH SUFFIX - XW

SCH. 80 PVC CONDUIT WITHFACTORY ELBOWS ANDASSOCIATED FITTINGS.

WIRING METHOD CAN BE

CLASS I, DIVISION 2501.10(B)(7)

Purpose of Change: To permit reinforced thermosetting resin conduit (RTRC) and Schedule 80 PVC incorrosion areas where RMC does not provide adequate corrosion resistance.

71Ill.: pg. 5-9

NEC: pg. 363

GRAYBOY, Inc. 2007

WIRINGMETHODS RMC IMC MI CABLE MC/HL CABLE

FMC OR LFMC DOES NOTCOMPLY WITH Ex. TO501.30(B) IN CLASS I,DIVISION 1 INSTALLATIONS

LISTEDFITTINGS

FMC OR LFMC SHALL NOT BEUSED AS THE SOLE G-FCP. EBJSHALL BE INSTALLED PER 250.102.

TYPES OF EQUIPMENT GROUNDING CONDUCTORS501.30(B)

CLASS I, DIVISION 1 AND 2

Purpose of Change: To clarify the use of flexible metal conduit (FMC) and liquidtightflexible metal conduit (LFMC) as an equipment grounding conductor in classifiedlocations.

72Ill.: pg. 5-12

NEC: pg. 367

GRAYBOY, Inc. 2007

NOTE 2: SINGLE-COMPONENTSTORED ENERGY SOURCES WITH: WELL-DEFINED PARAMETERS

SUCH AS SMALL CAPACITORSAND INDUCTORS CAN BE SIMPLEAPPARATUS

NOTE 3: FOR OVERALL SAFETY OFTHE SYSTEM, THE VALUES OFSUCH COMPONENTS SHALL BE

NOTE 1: THE TERM BE HASBEEN DELETED FROM THE FPN.

FUSE RESISTOR

ENERGY PATH TO GROUNDUNDER FAULT CONDITION

ZENERDIODE

HAZARDOUSLOCATION

NON-HAZARDOUSLOCATION

GES

INTRINSICALLY SAFECIRCUIT LOOP

SIMPLE APPARATUS504.2

Purpose of Change: To include single components in simple circuits well-defined parameters.

73Ill.: pg. 5-26

NEC: pg. 381

GRAYBOY, Inc. 2007

BARRIER

GES

RACEWAY

CABLES

CABLE TRAY

NOTE 1: IF PASSING THROUGH A DIVISION 2 OR ZONE 2LOCATION INTRINSICALLY SAFE AND NONINCENDIVE FIELDWIRING CIRCUITS CAN BE RUN IN THESE WIRING METHODS.

CLASS I, DIVISION 2(CI, D2) LOCATION

RACEWAY, CABLETRAY OR CABLE 504.30(A)(1), Ex. 3

INTRINSICALLY SAFECIRCUITS AND NONINCENDIVECIRCUITS ROUTED TOGETHER

HAZARDOUS LOCATION SAFE AREA

NOTE 2: WIRINGMETHODS AREPASSING THROUGHCLASS I, DIVISION 2LOCATION.

NOTE 3: NONINCENDIVE FIELDWIRING CIRCUITS ARE DESCRIBEDIN: 501.10(B)(3) 502.10(B)(3) 503.10(B)(3) 505.15(C)(1)(g) AND 506.15(C)(7)SEE FPN TO 504.30(A)(1), Ex. 4

FROM NONINTRINSICALLY SAFE CIRCUIT CONDUCTORS504.30(A)(1), Ex. 3

Purpose of Change: To provide requirements for running intrinsically safe circuits (ISCs) and nonincendive (NCCS) circuits together.

74Ill.: pg. 5-28

NEC: pg. 382

GRAYBOY, Inc. 2007NOTE: SEALS SHALL BE IDENTIFIED FOR THE PURPOSE OF MINIMIZING PASSAGEOF GASES, VAPORS, OR DUST UNDER NORMAL OPERATING CONDITIONS.

HAZARDOUS LOCATION 504.70 TABLE 514.3(B)(1)

NONHAZARDOUS LOCATION

READOUT PANELWITH BARRIERS

SEAL 514.9(B)

SEAL 504.70

SEALS 504.70 514.9(A)

SEALS ARE NOT REQUIREDTO BE EXPLOSIONPROOFOR FLAMEPROOF 504.70

POWER-CIRCUIT 430.22(A)

INTRINSICALLYSAFE CIRCUIT 504.2

SEALING504.70

Purpose of Change: This revision clarifies that seals do not have to be explosionproof or flameproof.

75Ill.: pg. 5-32

NEC: pg. 383

GRAYBOY, Inc. 2007

DEDICATED VENTILATIONAND EXHAUST SYSTEM

AIRCRAFT HANGAR

SPRAYING

DIPPINGPROCESS

TANK

COATINGPROCESS

EXHAUST DUCT

NOTE: AN AIRCRAFT HANGERCONSTRUCTED FOR THE EXPRESSPURPOSE OF:

SPRAY COATING DIPPING

MUST BE PROVIDED WITH

DEDICATED VENTILATIONSUPPLY AND

EXHAUST BASED ON DEFINITIONIN 513.2

AIRCRAFT PAINTING HANGER513.2

Purpose of Change: To include requirements for painting processes in aircraft hangars.

76Ill.: pg. 5-52

NEC: pg. 407

GRAYBOY, Inc. 2007

10' 5'

5'5'

5'

ALSO, SEENFPA 33

5' ABOVE ENGINEENCLOSURE AND WING 513.3(C)

5' FROM FUELTANK IN WINGS 513.3(C)

SPRAY OPERATIONS IN AIRCRAFT HANGARCONSTRUCTED LIKE A HUGE PAINT BOOTH 513.3(C)(2)

VICINITY OF AIRCRAFT513.3(C)(2)

Purpose of Change: To include requirements for large aircraft hangars constructed like a paint booth.

77Ill.: pg. 5-53

NEC: pg. 408

GRAYBOY, Inc. 2007

TASK ILLUMINATION BATTERY CHARGER FORBATTERY POWERED LIGHTS AND SELECTEDRECEPTACLES FOR GENERATOR SET ANDTRANSFER SWITCH LOCATIONS

ALARM AND ALERTING SYSTEMS(1) FIRE ALARMS(2) ALARMS REQUIRED FOR SYSTEMS USED

FOR THE PIPING OF NONFLAMMABLEMEDICAL GASES

(3) MECHANICAL CONTROL, AND OTHERACCESSORIES REQUIRED FOR EFFECTIVELIFE SAFETY SYSTEMS OPERATION

GENERATOR SET ACCESSORIES

THE FOLLOWING SHALL BE PERMITTED TO BECONNECTED TO THE LIFE SAFETY BRANCH:

LIFE SAFETY BRANCH517.32(C); (E); (F)

Purpose of Change: There revisions clarify the items permitted to be connected to the life safety branch.

78Ill.: pg. 5-58

NEC: pg. 433

GRAYBOY, Inc. 2007

COLOR CODEGREEN, GREEN WITHYELLOW STRIPE 517.13(B) 517.18(B) 517.19(B)(2)

GROUNDED (N) SLOTLONG SLOT

SILVER TERMINAL (N)

COLOR CODE ORANGE WITH A

DISTINCTIVECOLORED STRIPEOTHER THAN WHITE,GREEN, OR GRAY

517.160(A)(5)(1)

UNGROUNDED (PHASE) SLOTSHORT SLOT

BRASS TERMINAL (H)

COLOR CODE BROWN WITH A

DISTINCTIVE COLOREDSTRIPE OTHER THANWHITE, GREEN, OR GRAY

517.160(A)(5)(2)GREENTERMINAL

CONDUCTOR IDENTIFICATION517.160(A)(5)

Purpose of Change: This revision clarifies that striped isolated conductors providesproper identification for isolated power systems.

79Ill.: pg. 5-62

NEC: pg. 442

GRAYBOY, Inc. 2007

PART III - CONTROL CIRCUIT WIRING METHODS

522.20522.21522.22522.23522.24

522.25522.28

CONDUCTORS, BUSBARS, AND SLIP RINGSCONDUCTOR SIZINGCONDUCTOR AMPACITYOVERCURRENT PROTECTION FOR CONDUCTORSCONDUCTORS OF DIFFERENT CIRCUITS IN THE SAME CABLE, CABLE TRAY, ENCLOSURE,OR RACEWAYUNGROUNDED CONTROL CIRCUITSCONTROL CIRCUITS IN WET LOCATIONS

PART II - CONTROL CIRCUIT

522.10 POWER SOURCES FOR CONTROL CIRCUITS

ARTICLE 522 - CONTROL SYSTEMS FOR PERMANENT AMUSEMENT ATTRACTIONS

PART I - GENERAL

SECTION HEADING

SCOPEDEFINITIONSOTHER ARTICLESVOLTAGE LIMITATIONSMAINTENANCE

SECTION

522.1522.2522.3522.5522.7

CONTROL SYSTEMS FOR PERMANENTAMUSEMENT ATTRACTIONS

ARTICLE 522

Purpose of Change: A new article has been added to address the requirements for control systems forpermanent amusement attractions.

80Ill.: pg. 5-68

NEC: pg. 453

GRAYBOY, Inc. 2007

NOTE: WHERE MORE THEN FIVE CIRCUITS WITHOUT A LISTED ENERGY MANAGEMENT SYSTEMARE EMPLOYED, A 50-AMPERE 120/240 VOLT POWER SUPPLY ASSEMBLY AND A MINIMUM 50-AMPERE RATED DISTRIBUTION PANELBOARD SHALL BE USED PER 551.42(D).

DISTRIBUTION PANELBOARDS 120 VOLTS MAXIMUM 120/240 VOLTS MAXIMUM

LISTED FOR 30 AMP APPLICATIONS 551.42(C)

ELECTRICAL SYSTEM 120 VOLTSMAXIMUM TWO TO FIVE 15 OR 20 AMPERE 551.42(C)

POWER SUPPLY 30 AMPERE 551.42(C)

TWO TO FIVE 15- OR 20-AMPERE CIRCUITS551.42(C)

Purpose of Change: This revision clarifies that a 120 volt or 120/240 volt rated distribution panelboards shall bepermitted with a 30 amp power supply assembly.

81Ill.: pg. 5-84

NEC: pg. 479

GRAYBOY, Inc. 2007

LIQUIDPIPING

ELECTRICALEQUIPMENT

WIRING METHODAND CONDUIT

DISPENSINGUNIT

ON SHOREGENERAL 555.21(A)CLASSIFICATION OF CLASS I,DIVISION 1 AND 2 AREAS 555.21(B)CLOSED CONSTRUCTION 555.21(B)(1)(a); (b)OPEN CONSTRUCTION 555.21(B)(2)(a); (b)

CLASSIFICATION OF CLASS I, DIVISION 1 AND 2 AREAS555.21(B)(1); (B)(2)

Purpose of Change: To include requirements to provide coverage of open and closed constructionmethods for docks, marinas, and piers.

82Ill.: pg. 5-90

NEC: pg. 501

GRAYBOY, Inc. 2007

SPORTSTORE

SHOESTORE

CLOTHESSTORE

BEAUTYSALON

DRUGSTORE

SECTION SIGN 600.2

SECTION SIGNS SHALL BE MARKEDTO INDICATE THAT FIELD-WIRINGAND INSTALLATION INSTRUCTIONSARE REQUIRED

1 5

ELECTRIC SIGN SECTION

OF

1 5

ELECTRIC SIGN SECTION

2 5

ELECTRIC SIGN SECTION

3 5

ELECTRIC SIGN SECTION

4 5

ELECTRIC SIGN SECTION

5 5

ELECTRIC SIGN SECTION

OF

OF

OF

OF

OF

SUBASSEMBLIES

SECTION SIGNS600.4(C)

Purpose of Change: A new section has been added to require section signs to be marked toindicate that field-wiring and installation instructions are required.

83Ill.: pg. 6-4

NEC: pg. 504

GRAYBOY, Inc. 2007

DRIVE THRU

ACCESS DOORWAY 3' x 2' (900 mm x 600 mm)PERMANENT WALKWAY 600.21(E)

LIGHTING OUTLET CONTAINING A SWITCH

OR CONTROLLED BY AWALL SWITCH

600.21(E)

ATTIC AND SOFFIT LOCATIONS600.21(E)

Purpose of Change: This revision clarifies that at least one lighting outlet containing aswitch or controlled by a wall switch shall be installed in attic and soffit locations.

84Ill.: pg. 6-15

NEC: pg. 507

GRAYBOY, Inc. 2007

FIELD INSTALLED SKELETON TUBING

1/4" (6 mm) SPACING 600.41(C)

DISCONNECT 600.6 404.14

TRANSFORMER

TRANSFORMER ENCLOSUREFLEXIBLE METALCONDUIT ARTICLE 348

PK HOUSING

EXTERIOR WALL

BRANCH-CIRCUIT 600.5(A); (B) 210.19(A)(1)

TUBE SUPPORT WITHIN 6" (150 mm)

FROM THE ELECTRODECONNECTION

600.41(B)

SUPPORT600.41(B)

1 1/2" (38 mm) SEPARATIONFROM TUBE SUPPORT FORTERMINALS 600.32(E)

Purpose of Change: This revision clarifies that neon tubing shall be supported within 6 in. (150 mm)from the electrode connection.

85Ill.: pg. 6-21

NEC: pg. 509

GRAYBOY, Inc. 2007

HOISTWAY

CORD HARD USAGE OIL

RESISTANT TYPE 6' (1.8 m) MAX 620.21(A)(1)(e)

SUMP PUMP OROIL RECOVERY PUMP 620.21(A)(1)(e)

PIT

WIRING METHODS620.21(A)(1)(e)

Purpose of Change: A new subdivision has been added to permit a sumppump or oil recovery pump to be cord- and plug-connected.

86Ill.: pg. 6-28

NEC: pg. 520

GRAYBOY, Inc. 2007

MACHINE ROOM ARTICLE 620, PART VIII

DISCONNECTING MEANS SHALL BE LISTED CAPABLE OF BEING LOCKED IN THE

OPEN POSITION PROVISIONS FOR LOCKING OR ADDING A

LOCK TO THE DISCONNECTING MEANSSHALL BE INSTALLED AND REMAIN INPLACE WITH OR WITHOUT THE LOCKINSTALLED

620.51(A)

10TH FLOOR

ELEVATOR CAR

CONTROLLER LOCATED IN HOISTWAY 620.51(C)(1)

DISCONNECTING MEANS (ADDITIONAL) NON-FUSED LISTED CAPABLE OF BEING LOCKED IN THE

OPEN POSITION LOCATED WITHIN SIGHT OF THE

MOTOR CONTROLLER PROVISIONS FOR LOCKING OR

ADDING A LOCK TO THEDISCONNECTING MEANS SHALL BEINSTALLED AND REMAIN IN PLACEWITH OR WITHOUT THE LOCK INSTALLED

620.51(C)(1)

NOTE: PORTABLE MEANS FOR ADDINGA LOCK TO THE SWITCH OR CIRCUITBREAKER SHALL NOT BE PERMITTED.

ON ELEVATORS WITHOUT GENERATOR FIELD CONTROL620.51(C)(1)

Purpose of Change: This revision clarifies that where the motor controller is located in the elevator hoistway, the disconnectingmeans required by 620.51(A) shall be located in a machinery space, machine room, control space or control room outside thehoistway; and as additional disconnecting means (non-fused) shall be located within sight of the motor controller.

87Ill.: pg. 6-34

NEC: pg. 524

G

RAYB

OY,Inc.2007

POSTS

OVERHEAD GANTRY

ARTICLE 626 - ELECTRIFIED TRUCK PARKING SPACES

PART I - GENERAL

SECTION HEADING

626.1626.2626.3626.4

SCOPEDEFINITIONSOTHER ARTICLESGENERAL REQUIREMENTS

PART II - ELECTRIFIED TRUCK PARKING SPACE ELECTRICAL WIRING SYSTEMS

626.10626.11

BRANCH CIRCUITFEEDER AND SERVICE LOAD CALCULATIONS

PART III - ELECTRIFIED TRUCK PARKING SPACE SUPPLY EQUIPMENT

626.22626.23626.24626.25626.26626.27

WIRING METHODS AND MATERIALSOVERHEAD GANTRY OR CABLE MANAGEMENT SYSTEMELECTRIFIED TRUCK PARKING SPACE SUPPLY EQUIPMENT CONNECTION MEANSSEPARABLE POWER-SUPPLY CABLE ASSEMBLYLOSS OF PRIMARY POWERINTERACTIVE SYSTEMS

PART IV - TRANSPORT REFRIGERATED UNITS (TRUs)

626.30626.31626.32

TRANSPORT REFRIGERATED UNITSDISCONNECTING MEANS AND RECEPTACLESSEPARABLE POWER SUPPLY CABLE ASSEMBLY

ELECTRIFIED TRUCK PARKING SPACESARTICLE 626

Purpose of Change: A new article has been added to address requirements for electrified truck parkingspaces.

88Ill.: pg. 6-38

NEC: pg. 531

GRAYBOY, Inc. 2007

MAINTENANCE DISCONNECTINGMEANS SHALL BE PROVIDED FOR ALL

UTILIZATION EQUIPMENT OTHERTHAN LIGHTING

SHALL BE READILY ACCESSIBLEAND WITHIN SIGHT

680.12

DISCONNECT MUST BE LOCATED ATLEAST 5' (1.5 m) HORIZONTALLY FROMTHE INSIDE WALL OF POOL, SPA, ORHOT TUB 680.12

5' (1.5 m)

NOTE: A PERMANENTLY INSTALLED BARRIER BETWEENTHE OPEN WATER AND DISCONNECTING MEANS SHALL BEPERMITTED TO REDUCE THE 5 FT (1.5 m) REQUIREMENTSBUT STILL REQUIRES A 5 FT REACH PATH OR GREATER.

MAINTENANCE DISCONNECTING MEANS680.12

Purpose of Change: This revision clarifies the distance for the disconnecting means from open water.

89Ill.: pg. 6-51

NEC: pg. 561

GRAYBOY, Inc. 2007

Purpose of Change: This revision clarifies the requirements for inspections, relamping or othermaintenance for underwater wet-niche luminaires.

SERVICING680.23(B)(6)

CABLE LENGTH SHALL ALLOWREMOVED LUMINAIRE ON POOLDECK FOR INSPECTION, RELAMPINGOR OTHER MAINTENANCE680.23(B)(6)

WATER LEVEL

DECK BOX 680.24(A)(2)

TO PANELBOARD 680.23(F)

CONDUIT 680.23(B)(2)

WET-NICHE POOL LIGHT 680.23(B)

NOTE: THE LUMINAIRE MAINTENANCELOCATION SHALL BE ACCESSIBLEWITHOUT ENTERING OR GOING INTHE POOL WATER.

90Ill.: pg. 6-56

NEC: pg. 563

G

RAYB

OY,Inc.2007

8AWG cu. BONDINGCONDUCTOR 680.26(B)(1)(b)

METALPOST

METAL LADDERS,SLIDES, POSTS, ETC. 680.26(B)(3)

WATERCIRCULATINGPUMP 680.26(B)(6)

METALSKIMMER 680.26(B)(3)

DIVING BOARD

DECK

METALDRAIN 680.26(B)(3)

METAL LIGHTFORMING SHELL 680.26(B)(3) 8 AWG BARE SOLID CONDUCTOR INSTALLED TO

PROVIDE A 12 IN. (300 mm) x 12 IN. (300 mm)NETWORK UNDER THE POOL AND DECK PER680.26(B)(1)(b)

DECK BOX(IF WITHIN 5' (1.5 m) OFINSIDE WALL OF POOL) 680.26(B)(7)

BOND POOLIN WATER 600.26(C)(3)b

EQUIPOTENTIAL BONDING680.26(A) THROUGH (C)

COPPER CONDUCTOR GRID

BE CONSTRUCTED OF MINIMUM 8 AWG BARE SOLIDCOPPER CONDUCTORS BONDED TO EACH OTHER ATALL POINTS OF CROSSING

CONFORM TO THE CONTOUR OF THE POOL AND THEPOOL DECK

BE ARRANGED IN A 12 IN. (300 mm) BY 12 IN. (300 mm)NETWORK OF CONDUCTORS IN A UNIFORMLYSPACED PERPENDICULAR GRID PATTERN WITHTOLERANCE OF 4 IN. (100 mm)

CONDUCTIVE POOL SHELLS

POURED CONCRETE PNEUMATICALLY APPLIED OR SPRAYED CONCRETE CONCRETE BLOCK WITH PAINTED OR PLASTERED

COATINGS

ALTERNATE MEANS

AT LEAST ONE MINIMUM 8 AWG BARE SOLID COPPERCONDUCTOR SHALL BE PROVIDED THE CONDUCTORS SHALL FOLLOW THE CONTOUROF THE PERIMETER SURFACE THE REQUIRED CONDUCTOR SHALL BE 18 TO 24 IN.(450 mm TO 600 mm) FROM THE INSIDE WALL OF THEPOOL THE REQUIRED CONDUCTOR SHALL BE SECUREDWITHIN OR UNDER THE PERIMETER SURFACE 4 TO 6IN. (100 mm TO 150 mm) BELOW THE SUBGRADE

ALTERNATE MEANS

VINYL LINERS FIBERGLASS COMPOSITE

Purpose of Change: This revision clarifies the equipotential bonding requirements.

91Ill.: pg. 6-61

NEC: pg. 566

GRAYBOY, Inc. 2007

POOL FILTER PUMP ISDOUBLE INSULATED

NO BONDING REQUIREDFOR THESE ITEMS

42"(1 m)MAX.

STORABLE POOL MAXIMUM DEPTH

42 IN. 680.2

RECEPTACLE LOCATED AT LEAST

6' (1.8 m) FROM THEINSIDE WALLS OFTHE POOL

680.34

GFCI-PROTECTION PROVIDE WITH A GFCI THAT IS AN

INTEGRAL PART OF THE ATTACHMENTPLUG OR

LOCATED IN THE POWER SUPPLYCORD WITHIN 12 (300 mm) OF THEATTACHMENT PLUG

680.31

PUMPS680.31

Purpose of Change: This revision clarifies that storable pool cord-connected filter pumps shall be protectedwith a GFCI that is an integral part of the attachment plug or located in the power supply cord within 12 inchesof the attachment plug.

92Ill.: pg. 6-63

NEC: pg. 568

GRAYBOY, Inc. 2007

GENERATOR 695.2

PIPING

FIRE PUMP

FIRE PUMPCONTROLLER

2-HOUR FIRERESISTANT RATING 695.6(B)(1); (B)(2)LISTING

695.10

CIRCUIT CONDUCTORS695.6(B)(1), (B)(2), AND (B)(3)

Purpose of Change: This revision clarifies that fire pump supply conductors shall be protected by a 2-hour fireresistance rating if not encased in a minimum of 2 in. (50 mm) of concrete or by a listed electrical protectivesystem with a 2-hour minimum fire rating.

93Ill.: pg. 6-80

NEC: pg. 594

GRAYBOY, Inc. 2007

EMERGENCYPOWER SOURCE 700.5(B)

SWITCHBOARD SEPARATE VERTICAL SECTIONS 700.9(B)(5)(a)

GENERATOR 445.19(1)

TRANSFEREQUIPMENT

SERVICEEQUIPMENT

NORMALPOWERSOURCE

EMERGENCY LEGALLYREQUIREDSTANDBY

OPTIONALSTANDBY

94Ill.: pg. 7-3

NEC: pg. 597

GRAYBOY, Inc. 2007

EMERGENCYPOWER SOURCE 700.5(B) WIREWAY

GENERATOR 445.19(2)

TRANSFEREQUIPMENT

SERVICEEQUIPMENT

NORMALPOWERSOURCE

EMERGENCY LEGALLYREQUIREDSTANDBY

OPTIONALSTANDBY

FEEDER (SINGLE) SEPARATE ENCLOSURE 700.9(B)(5)(b)

94.2Ill.: pg. 7-3

NEC: pg. 597

GRAYBOY, Inc. 2007

FEEDER (MULTIPLE)

GENERATOR 445.19(2)

TRANSFEREQUIPMENT

SERVICEEQUIPMENT

NORMALPOWERSOURCE

EMERGENCY LEGALLYREQUIREDSTANDBY

OPTIONALSTANDBY

FEEDER (SINGLE) SEPARATE ENCLOSURE 700.9(B)(5)(b)

WIRING700.9(B)(5)

Purpose of Change: A new subdivision has been added to provide wiring requirements for the emergency source.

94.3Ill.: pg. 7-3

NEC: pg. 597

GRAYBOY, Inc. 2007

NOTE 2: IF NORMAL POWER FAILS, DIMMER SYSTEM SHALLSELECTIVELY ENERGIZE EMERGENCY BRANCH-CIRCUITS TOSUPPLY MINIMUM EMERGENCY ILLUMINATION.

NOTE 1: LISTED CONTROL DEVICE USED TO ENERGIZEEMERGENCY LIGHTING CIRCUITS PER 700.23.

MORE THANONE DIMMER 700.23

DIMMER SYSTEM 700.23

LABEL IDENTIFYINGCIRCUITS

DIMMER SYSTEMDISCONNECTS

FLOURESCENT LIGHTING

HIGH-INTENSITYDISCHARGE LIGHTING

DIMMER SYSTEMS700.23

Purpose of Change: A new section has been added to address a dimmer systemcontaining more than one dimmer and listed for use for emergency systems.

95Ill.: pg. 7-9

NEC: pg. 600

GRAYBOY, Inc. 2007

SERVICEEQUIPMENT

NORMALPOWERSOURCE

FEEDER (MULTIPLE)

GENERATOR 445.19(2)

AUTOMATICTRANSFERSWITCH

ALLLOADS

ALTERNATEPOWERSOURCE 702.5(B)

OPTIONAL STANDBY SYSTEM

WHERE A SYSTEM IS EMPLOYED THAT WILL AUTOMATICALLYMANAGE THE CONNECTED LOAD, THE STANDBY SOURCESHALL HAVE A CAPACITY SUFFICIENT TO SUPPLY THEMAXIMUM LOAD THAT WILL BE CONNECTED BY THE LOADMANAGEMENT SYSTEM

702.5(B)(2)(b)

SYSTEM CAPACITY702.5(B)

Purpose of Change: This revision clarifies the installation of manual transfer and automatic transfer applicationsfor optional standby systems.

96Ill.: pg. 7-11

NEC: pg. 604

GRAYBOY, Inc. 2007 ARTICLE 708 - CRITICAL OPERATIONS POWER SYSTEMS (CDPS)

PART I - GENERAL

SECTION HEADING

708.1708.2708.3708.4708.5708.6708.8

SCOPEDEFINITIONSAPPLICATION OF OTHER ARTICLESRISK ASSESSMENTPHYSICAL SECURITYTESTING AND MAINTENANCECOMMISSIONING

708.10708.11708.12708.14

FEEDER AND BRANCH-CIRCUIT WIRINGBRANCH CIRCUIT AND FEEDER DISTRIBUTION EQUIPMENTFEEDERS AND BRANCH CIRCUITS SUPPLIED BY COPSWIRING OF HVAC, FIRE ALARM, SECURITY, EMERGENCY COMMUNICATIONSAND SIGNALING SYSTEMS

708.20708.22708.24708.30

SOURCES OF POWERCAPACITY OF POWER SOURCESTRANSFER EQUIPMENTBRANCH CIRCUITS SUPPLIED BY COPS

708.50708.52708.54

ACCESSIBILITYGROUND-FAULT PROTECTION OF EQUIPMENTCOORDINATION

708.64 EMERGENCY OPERATIONS PLAN

PART II - CIRCUIT WIRING AND EQUIPMENT

PART III - POWER SOURCES AND CONNECTION

PART IV - OVERCURRENT PROTECTION

PART V - SYSTEM PERFORMANCE AND ANALYSIS

Purpose of Change: A new article has been added dealing with mission critical power systems withdetailed installations for electrical power for vital infrastructures.

97Ill.: pg. 7-13

NEC: pg. 609

GRAYBOY, Inc. 2007

CONDUCTORS(NOT FUNCTIONALLYASSOCIATED) CLASS I POWER-SUPPLY 725.48(B)(4)(1)

NOTE: IF A BARRIER IS NOT INSTALLED, ALLOF THE CONDUCTORS SHALL BE INSTALLEDWITHIN SEPARATE MULTICONDUCTOR TYPEAC, TYPE MC, TYPE MI, OR TYPE TC CABLESAND ALL OF THE CONDUCTORS IN THECABLES SHALL BE INSULATED AT 600 VOLTS.

BARRIER 725.48(4)

IN CABLE TRAYS725.48(B)(4)

Purpose of Change: This revision clarifies the permitted methods of installation for Class Icircuit conductors and power-supply conductors that are not functionally associated.

98Ill.: pg. 7-17

NEC: pg. 617

GRAYBOY, Inc. 2007

ABANDONED CABLES SHALL BE REMOVED COMMUNICATIONS CABLES COAXIAL CABLES NETWORK-POWERED BROADBAND CABLES 800.25 820.25 830.25

FIREWALL PENETRATIONS OPENINGS SHALL BE FIRE STOPPED

USING APPROVED METHODS TOMAINTAIN THE FIRE RESISTANCE RATING

800.26 820.26 830.26

CABLE PENETRATIONS COMMUNICATIONS CABLES COAXIAL CABLES NETWORK-POWERED

BROADBAND CABLES

OKAY

ABANDONED CABLES AND SPREAD OFFIRE OR PRODUCTS OF COMBUSTION

800.25800.26

Purpose of Change: A new section has been added to address the requirements for the prevention of thespread of fire and one has been added dealing with abandoned cables.

99Ill.: pg. 8-4

NEC: pg. 641

GRAYBOY, Inc. 2007

Purpose of Change: A new section has been added to require a minimum of onecommunications outlet within a dwelling unit for new construction.

DWELLING UNIT COMMUNICATIONS OUTLET800.156

LIVINGROOM

BD 2

BD 3 BR 1

BR 2BD 1

DEN

KITCHEN

ATTIC

COMMUNICATIONS OUTLET NEW CONSTRUCTION AT LEAST ONE INSTALLED CABLED TO THE SERVICE

PROVIDER DEMARCATION POINT 800.156

100Ill.: pg. 8-10

NEC: pg. 647

'2008.Changes.Ch.01.pdfSlide #190.2(B)(5)bBonded (Bonding)Branch-Circuit Overcurrent DeviceClothes ClosetElectrical Power ProductionEquipmentGrounding Conductor, EquipmentGroundGroundedGrounded, EffectivelyGrounding ElectrodeGrounding Electrode ConductorIntersystem Bonding TerminationLuminaireManufactured HomesNeutral ConductorQualified PersonShort-Circuit Current Rating.1Short-Circuit Current Rating.2Short-Circuit Current Rating.3Surge ArresterUngroundedUtility-Interactive Inverter110.12(A)110.16.1110.16.2110.20.1110.20.2110.22(A)-(C)110.26(C)(1); (C)(2)110.26(C)(3)110.33(A)110.33(A)(3)

'2008.Changes.Ch.02-1.pdf200.2210.4(B)210.4(D)210.5(C)210.8(A)(2)-(A)(5)Slide #6210.8(B)(4)210.12(B)210.12(B), Ex.210.12(B), Ex. 2210.19(A)(1), EX. 2210.52(C)210.52(E)(1) - (E)(3)210.62215.2(A)(1), Ex. 2-1215.2(A)(1), Ex. 2-2215.6.1215.6.2215.12(C)225.18225.39230.24(B)230.40, Ex. 1230.44, Ex.230.71(B)230.95, Ex. 2230.205(A)240.4(D)240.21(C)(2)(4)240.21(C)(3)240.21(H)240.24(F)240.86(A).1240.86(A).2240.91(A); (B)240.92(B)250.6(A)250.8(A); (B)250.20(A)(3)250.20(D)250.21(B)250.22(5)250.24(D)250.28(D)(1) - (D)(3)250.30(A)250.30(A)(4)250.32(A)250.32(B); Ex.

'2008.Changes.Ch.02-2.pdf250.35250.36250.52(A)(2)250.52(A)(3)250.52(A)(5)250.54250.56250.64(D)(1) - (D)(3)250.64(E)250.68(A), Ex. 2250.94250.104(A)(2)250.104(D)(1), Ex. 1250.106, FPN 1250.112(I)250.119, Ex.250.119(A)250.122(C)250.122(F)250.146250.146(A)250.146(D)250.166280.2285.23(A); (B)285.24285.25

'2008.Changes.Ch.03.pdf300.4(E)300.4(G)300.5(B)300.9300.12, Ex. 2300.11(A)(2)Table 300.50, Note 3Table 300.50d310.7, FPN310.15(B)(2)(c).1310.15(B)(3)310.15(B)(6)314.16314.16(B)(1)314.16(B)(4)314.24(A)-(C)314.27(A); (B)314.27(E); Ex.314.28(A)320.10(1)328.10(3); Ex.330.10(B)(4)334.12(A)(1), Ex.334.15(B)334.15(C).1334.15(C).2334.80.1334.80.2336.10(7), Ex.338.12(A); (B)342.30(C)344.10(A)-(C)344.30(C)348.12(1)(1)348.30(A), Ex. 1348.60350.30(A), Ex. 1350.30(A), Ex. 2350.60352.30(C)Article 355356.10(7)358.30(C)362.30(A), Ex. 3366.2366.23(A)376.22(A); (B)376.56(B)(4)376.100382.6382.10(A)382.10(C)382.42(B)392.8(A)392.9(A)(1)392.11(C)(1); (C)(2)396.30(A)-(C)

'2008.Changes.Ch.04.pdf402.11404.4404.8(C)404.9(B)(1)406.4(G)406.8(A)406.8(B)(1), Ex.406.11408.3(F)408.4408.36, Ex. 1; Ex. 2408.54408.55, Ex. 1408.58409.2410.10(D)410.16(D)(1) - (D)(5)410.62(C)(1)(2)c410.130(A)410.130(G)410.141(B)410.151(B), FPN411.3(A); (B)411.4(A); (B)411.5(D)(1) - (D)(3)422.51424.19426.50(A)427.13430.32(C)430.52(C)(1), Ex. 2430.81(A)430.102(B)(1); (B)(2)430.103430.110(C)(1).1430.126430.227440.14, Ex.1445.13445.18445.19.1445.19.2450.5(B)(2)(b), Ex.490.44(C)490.46

'2008.Changes.Ch.05.pdf500.7(K)(1)-(K)(3)500.8(A), FPN501.10(B)(7)(7)501.30(B)501.100(A)(2)502.30(B)502.120(B)(2)502.130(B)(2)502.150(B)(1)503.30(B)504.2504.30(A)(1), Ex. 3504.30(A)(2)504.70505.2505.8(K)(1)-(K)(3)505.9(F)505.17(6)505.25(B)506.2Table 506.9506.9(C)(1)&(C)(2)506.9(F)506.25(B)513.2513.3(C)(2)517.2517.19(D)517.32(C); (E); (F)517.34(A)&(B)517.160(A)(5)518.3(B)518.5; Ex.Article 522525.5(B)(1); (B)(2)547.5(F)547.5(G)547.9(E)547.10(A)(1); (A)(2)550.2550.20(A)550.25(B)551.42(C)551.47(S)555.9555.21(B)(1); (B)(2)

'2008.Changes.Ch.06.pdf600.2600.4(C)600.5(C)(3)600.6(A)(1)600.6(A)(2)(3)600.7(A); (B)600.12(A)-(C)600.21(E)600.24(A)-(C)600.32(K)600.41(B)600.41(D)600.42(G)(1); (G)(2)610.31(2)620.21(e)620.21(A)(3)(e)620.51(A)620.51(C)(1)625.23626.1-32.1640.6(A)-(D)645.5(F); (G)647.8(A)665.12675.8(B)680.10680.12680.22(A)(1)-(A)(3)680.22(E); FPN680.23(B)(6)680.26(A)-(C).1680.31680.43(D), Ex. 2680.71680.74690.4(D)690.5(A)-(C)690.43690.62695.6(B)(1); (B)(2)

'2008.Changes.Ch.07.pdf700.6(C)(1)700.9(B)(5).1700.9(B)(5).2700.9(B)(5).3700.9(D)(3)700.23702.5(B)Article 708Article 725.1Article 725.2725.48(B)(4)Article 760.1Article 760.2Article 770

'2008.Changes.Ch.08.pdf800.2800.25; 26800.93(A); (B)800.100(A)(6)800.156

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