2005 National Electrical Code® Search Term Index by
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abandoned 372.13
abandoned audio distribution cable 640.2 640.3A
abandoned fire alarm cable 760.2
abrasives foreign material 110.12C
AC armored cable type 320
AC resistance for aluminum wire Chapter 9 Table 9
AC resistance for uncoated copper wire Chapter 9 Table 9
access to occupants 225.35 240.24B
additional grounding requirements table 250.3
adequate, not necessarily 90.1B
adjacent conductors 310.10 FPN (4)
adjacent devices 404.8B
adjacent runs of heating cable 424.41B
adjustable speed drive control example calculation Appendix D10
adjustable speed drive systems 430.2
adjustable-trip circuit breaker 240.6B
adobe 334.10B3
aerial cable identification 200.6A(4)
AFCI arc fault circuit interrupter 210.12 440.65
AHJ authority having jurisdiction 100
aggregate 314.29ex.
air blowers 680.62A(1)
air conditioner branch circuits 440.6 440.31 440.32
aircraft batteries 513.10A(2)
aircraft hangers 500.9 513.1
airflow 424.59
airflow can be reversed 110.57
airport runways 300.50A ex. 5
airspace 312.2 A ex., 312.11 312.42 410.34
airspace 1/4 inch 300.6D
airstream duct heater 424.57
air terminals 250.60
air voids 334.10A2
alcohol based windshield washer fluid 511.3A(2)
alkali 480.2
alley clearance service 18 feet 230.24 B(4)
ALR aluminum letter designation 404.14C
alternate power source 517.2
alternating current resistance 600v 3Ø Chapter 9 Table 9
aluminum alloy 810.11
aluminum dust 500.6B(1) FPN
aluminum electrode conductor 18 inches to earth 250.64A
aluminum letter designation ALR 404.14C
aluminum not magnetic metal 300.20B FPN
amateur radio stations 810.51
ambient temperature 310.10 FPN (1)
ambulatory health care facility 517.2
American Wire Gage AWG 110.6
ammeter conductors over 600 volts 300.3C(2)
ampacities of conductors free air table 310.17
ampacities of conductors table 310.16
ampacity adjustment factor table 310.15B(2)a
ampacity adjustment for cords and cables table 400.5
ampacity calculation Annex B (back of the book)
ampacity correction for fill table 310.15B(2)a
amplifier audio 640.2
amusement rides 525.5B
anesthetizing location 517.2
angle pull six times 314.28A(2)
angular substances 300.5F
animal 547.1B(1)
animal hides 300.6C FPN
anodized 517.2
antenna clearances specifications 810.18A
antenna mast 810.21E
appliance garage 210.52C(5)
appliance load fixed four or more 75% 220.53
appliance outlets within 6 feet of intended location 210.50C
application provisions for conductors table 310.13
application provisions for fixture wire table 402.3
appurtenance, architectural 110.26F(2)
arc carbon 540.2
arc fault circuit interrupter 440.65
arc gases 100
architectural appurtenance 110.26F (2)
arcing effects 110.3A(6)
arcing parts 240.41
area compact aluminum conductor Chapter 9 Table 5A
armature shunt 430.29
array 690.2
askarel 100
askarel insulated transformers 450.25
asphalt 426.20C1
assembly occupancies list 518.2
associated apparatus 504.2
associated nonincendive field wiring 500.2
associated wiring systems bonding 250.60 FPN2
assured equipment grounding 527.6B2
athletic training rooms 680.60
attached garage needs receptacle outlet 210.52G
attached main bonding jumper 250.28C
attachment cap configuration drawing 552.44C
attic 600.21E
attic light 210.70A3
audible signal 610.57
audience area 520.1
audio amplifier 640.2
audio autotransformer 640.2
audio distribution cable abandoned 640.2
audio signal processing equipment 640.2
audio system 640.2
audio transformer 640.2
authority having jurisdiction AHJ 100
authorized management personnel 240.24B ex 1
automatic transfer switches 701.7C
autotransformer 410.78
autotransformer circuit 210.9, 215.11
autotransformer drawing 450.4A
average power demand 1 year 15 min 220.87 ex.
AWG American Wire Gauge 110.6
back-fed overcurrent devices 408.36F
backfeed 490.44B
backfeed source of power 404.6C ex.
backfill 300.5F
balancer sets 445.12D
balconies 110.33B
balconies clearance table 225.61
balcony, location of live parts 110.27A(3)
baled waste kapok 500.5D(1) FPN 2
barbed wire 110.31
bare conductors Chapter 9 Table 8 Note 8
bare copper bars 366.23A
bare metal parts spacing table 408.56 430.97D
barriered, energized parts of switches 404.5
bar type counter 550.13D(5)
baseboard heaters 424.9 210.52 FPN
bathroom GFCI receptacle within 3 feet adjacent wall 210.52D
bathtub 406.8C 410.4D
bathtub clearance to fixtures 3ft horizontal 410.4D
bathtub clearance to fixtures 8ft vertical 410.4D
bathtub rim 410.4D
battery, aircraft changed outside 513.10A(2)
battery circuits 690.85
beating rain 406.8A
bed 517.18B
bender table full shoe Chapter 9 Table 2
bending space Table 312.6A table 312.6B
bent parts 110.12C
binding screw conductor #10 or smaller 110.14A 334.40B
binding screw terminal 334.40B
bipolar photovoltaic array 690.2
birds 502.128(2) 503.128(2)
blades 406.6A
block, city 800.2
blocking diode 690.2
blue 322.120C 400.22C 424.35 504.80C
blue, light as grounded conductor 400.22C 504.80C
blue non heating lead 208 volts 424.35
boat hoists GFCI receptacle 210.8C
boat houses receptacles must be GFCI 210.8A(8)
boat yard branch circuits 555.19A(3)
body of water 680.1
bolts to fasten enclosure 314.23D(1)
bonding jumper 12 1/2% minimum 250.28D
bonding jumper can be wire, bus, screw 250.102A
bonding limits potential differences 250.60 FPN2
bonding type locknuts 250.92B(4)
border light 520.2
bored holes 1 1/4 inch from edge 300.4A(1)
bosses 300.4F ex.
bottom shield 324.2
boxes on opposite sides of wall 24 inches 300.21 FPN
box minimum depth 1/2 inch 15/16 w/device 314.24
box over 100 cubic inches 314.40C
braces as support for mast 230.28
braid colored 400.22A 400.23A
brake coils 610.42B(3)
branch circuit over 50 amperes supply only non-lighting loads 210.23D
branch circuits requirements table 210.24
brass box 314.40B
brazing splices 110.14B
breakout assembly 520.2
brick wall grounded table 110.26A(1) Condition 2
bridge expansion joints 426.21C
brittle 356.10 FPN 378.10 FPN
broadband cables 830.44I3
broken parts 110.12C
bronze 810.11
bronze box 314.40B
bronze cast 250.70(2)
brown 424.35 517.160A5(2)
brown non heating lead 277 volts 424.35
building clearance table 225.61
building component 545.2
building system 545.2
bulk storage plant 515.2
bull switch 530.2
bundled 520.2
bundled cables exceed 20 310.15B(2) ex.5 (3)
buried pipe 250.188E
bus bar higher voltage orange 110.15
bus enclosure table 408.5
bushing in lieu of box 600.16B
bus main bonding jumper 250.28A
busway taps 240.21E
butt contacts 404.6C
cable connector FCC 324.2
cable installation dimensions drawing 310.60
cable seals 505.16A(2)
cable tray system 392.2
cables in tunnels over 600 volts 110.51C
cadmium 552.10C(4) 480.2 690.72A FPN 668.1
calculations example problems Appendix D (back of the book)
camping trailer 551.2
candelabra-base pendant conductors 18AWG or larger 410.27B
canned pumps 501.15F(3)
canneries 300.6D FPN
canopy switches specifications 410.38C
car 110.19 250.136B 515.1 515.2 620.2
carbonaceous dusts 500.6B2
capacitive reactance Chapter 9 Table 9
carbon arc projector 540.2
carbon black 500.6B2
carbon disulfide 500.6A FPN3
carbonization 503.1
carnival covered in NEC 90.2A2 640.3G
carpet 324.1 800.154E(6) 725.61E(6)
carpet squares 36 inched square or less 324.2 324.41
cars in tunnels over 600 volts covered 110.51A
cartridge fuses 424.22C FPN
casings 250.112M 300.6C FPN
casings (animal) 300.6C FPN
cast bronze 250.70
cathodic protection systems 250.6E
CATV community antenna television 820.1
catwalks clearance 225.61
caustic alkalis 330.12(4)
ceiling cavity plenums 640.3B FPN
Ceiling fan 422.18
ceiling fan outlet 314.27D
ceiling grid can not support raceways 300.11A
ceiling support wires 300.11A(1)
cell 372.2 374.2
cells 480.6
cellulose nitrate film storage vault 530.51
cement 340.12(8) 334.12A(9)
center pivot irrigation machines 675.2
central heating branch circuit 422.12
central vacuum 422.15
chair lift runway 620.34
charcoal 500.6B2
charge controller 690.2
chassis terminal 551.56B
chemical action, deteriorated by not permitted 110.12C
chemical deicers 300.6C FPN
chemical exposure 300.6C(2)
chemical solvents 300.6C(2)
chemical splashing 300.6C(2)
chemical vapors 300.6C(2)
chemicals 300.6D FPN
chimney 450.24
chimneys clearance 3 feet 225.19B
chips 372.9
chlorine 330.12(4)
cinder fill 330.12(4) 342.10C
cinders 300.5F
circuit breakers in parallel 240.8
circuit directory 408.4
circuits 480 volts 210.6D
circuits over 600 volts 210.6E
circuits 277 volt 210.6C
circular mils of conductors Chapter 9 Table 8
circuses 640.3G
class gray 200.10D FPN
Class I, Class II Division 2 locations drawing 516.3B(1)
Class I Division 1 500.5B(1)
Class I Division 2 500.5B(2)
Class I locations gases or vapors 500.5B
Class I locations table 514.3B(1)
Class II Division 1 500.5C(1)
Class II Division 2 500.5C(2)
Class II locations 500.5C
Class II temperatures table 500.8C(2)
Class III Division 1 500.5D(1)
Class III Division 2 500.5D(2)
Class III locations 500.5D
Class 2 and class 3 circuit drawings 725.41
clean surfaces 250.12
cleaner foreign materials 110.12C
cleaning lighting fixtures 410.4C (3)
clearance above roofs 230.24A
clearance from windows 230.9A
clearance on buildings 230.9
clearance over bathtub 3ft horizontal 410.4D
clearance over bathtub 8ft vertical 410.4D
clearance over buildings 225.61
clearance over roadways 225.60
climbing space around communications wiring 225.14D
clips 410.16C
clips to fasten enclosure 314.23D(1)
clock 210.52B2ex.1
clock operated switch 680.23F(2)b
closed construction 545.2
closed loop 300.15M
closed loop power distribution 240.20C
closet receptacle not required 210.52A
closet storage clearance diagram 410.8
closet storage space 410.8A
closet storage space drawing 410.8
clothes dryer demand factors table 220.54
clothes dryer dwelling 5000 or nameplate 220.54
clothes dryer existing grounded 250.142B ex.1
clothes hanging rod 410.8A
clothing 500.5D1 FPN 1
clothing manufacturing 500.5D(1)
coal 500.6B2
CO/ALR copper/aluminum 404.14C
coated conductor resistance Chapter 9 Table 8
coaxial cable 620.36
cocoa 500.5C1 500.8A FPN
cocoa fiber 500.5D(1) FPN2
coefficient of expansion 300.7B FPN
coke dust 500.6B2
cold leads 427.18A
collar heater 427.4
collector rings 490.54 675.2
collectors 610.22
colored braid 400.22A 400.23A
colored separator 400.22D
colored stripe 200.6D
column width panelboard 300.3B(4)
combined rating of disconnects 230.80
combustible gas detection system 500.2 505.2
combustible metal ducts Class II 500.5C
commercial premises neutral 20 percent 250.184A(2)ex.
common area branch circuits 210.25
common bonding grid 680.26C
common coupling point 692.2
common neutral ampacity 225.7B
common neutral feeder 215.4A
common neutral outdoor lighting 225.7B
common return 610.15
common return pipe organ minimum #14 650.6A
communicating fire 408.7
compact aluminum conductor dimensions Chapter 9 Table 5A
compact stranding table C3A Note Appendix C
compact stranding 9% smaller Chapter 9 Table 8 Note 3
compartments 386.70
complete system free from shorts 110.7
compressed natural gas table 514.3B(2)
compressed stranding 3% smaller Chapter 9 Table 8 Note 3
compression glands 680.52B(1)a
compressors in tunnels over 600 volts covered 110.51A
concentric knockouts (same center point) 250.92B 250.97
concentric stranded conductors table C3 Note Appendix C
concentricity 400.4 note 5
concrete 334.10B (3)
concrete-encased 250.52A(3)
concrete wall grounded 110.26A(1)
condition 1 exposed live parts one nothing other 110.26A(1)
condition 2 exposed live parts one side grounded other 110.26A(1)
condition 3 exposed live parts both sides 110.26A(1)
conductive material 250.2 FPN
conductivity 100% copper 61% aluminum Chapter 9 Table 8 Note 4
conductor application table 310.13
conductor dimensions Chapter 9 Table 5
conductor insulation table 310.13
conductor maximum operating temperature table 310.13
conductor minimum size table 310.5
conductor properties Chapter 9 Table 8
conductor support spacing table 300.19A
conductor trade name table 310.13
conductor type letter table 300.13
conductor volume allowance table 314.16A 314.6B
conductors in tunnels over 600 volts 110.53
conductors on poles 225.14D
conductors racked in surface enclosures 110.12B
conductors normally copper 110.5
conduit area Chapter 9 Table 4
conduit bodies 314.16C2
conduit body fill requirement 314.16C(2)
conduit bushing temperature 300.4F
conduit fill Appendix C (back of the book)
conduit fill EMT Article 358 Chapter 9 Table 4
conduit fill ENT Article 362 Chapter 9 Table 4
conduit fill FMT Article 348 Chapter 9 Table 4
conduit fill IMC Article 342 Chapter 9 Table 4
conduit fill LFNC-B Article 356 Chapter 9 Table 4
conduit fill LFNC-A Article 356 Chapter 9 Table 4
conduit fill LFMC Article 350 Chapter 9 Table 4
conduit fill RMC Article 344 Chapter 9 Table 4
conduit fill RNC 80 Article 352 Chapter 9 Table 4
conduit fill RNC 40 Article 352 Chapter 9 Table 4
conduit fill percent table Chapter 9 Table 1
conduit fill table chart Annex C
conduit nipple 24 inches or less 60% fill Chapter 9 Table 1 Note 4
conduit seals 505.16A(1)
conduit support weight (single) 20 pounds 314.23F ex. 2e
configuration drawing attachment cap 552.44C
confusion 90.7
connected load multi family service 220.84C
connector strip 520.2
conspicuous warning signs 110.27C
contiguous 390.3D
continuity 250.53D(1)
continuous building management 240.24B ex. 1
continuous load overcurrent device 210.20A
control drawing 500.2
control system elevator 620.2
control system elevator drawing 620.2
controller motion 620.2
controller motor 620.2
controller operation 620.2
convenient, not necessarily 90.1B
covering of cable notes to table 400.4
converter 551.2
conveyors in tunnels over 600 volts covered 110.51A
convolutions 348.28
cooking hood 410.4C4
cooking hood lighting fixture 410.4C(1)(4)
coordinated short-circuit protection 240.12
copper clad steel 810.11
cord and plug connected appliance 80% 210.23A(1)
cord and plug connected lighting 50% 210.23A(2)
cord pendants 210.50A
corner-grounded delta 240.85 285.3(2)
corner-grounded delta transformer 250.20FPN
corrosion, deteriorated by 110.12C
corrugated metallic sheath 330.2
cotton 500.5D1 FPN 1
counter-mounted cooking unit 210.55
counter mounted cooking units existing grounded 250.142B ex.1
counter tops need GFCI receptacles 210.52C
counterweight 620.21A(4)
cove lighting space adequate to maintain 410.9
cover definition 300.50 Note
covered by the NEC 90.2A
cover (industrial surface) mounted receptacle 406.4C
cover requirements table 300.5
cover table 300.5 note 1
cranes branch circuit 610.42
crawl space receptacles GFCI protected 210.8A(4)
critical branch 517.2
crossings FCC 324.18
crowfeet 410.16D
crushed stone 450.27
cubic inch requirement per conductor table 314.16B
cultivated 225.18(4) 230.24B 830.11D(3)
cultivated land clearance service 18 feet 230.24
curb 368.10C (2)b
current limiting device 240.2
current transformer 240.20A 240.100A1 110.23
current transformer donut type 450.5A(3) FPN
current transformer shorted 110.23
curtain machines 520.48
d flameproof protection type 505.8A
dairy processing 300.6D
damaged parts - broken, bent, cut, deteriorated 110.12C
dampers 450.45E
damp location conductors 310.8B
damp paper 300.6D
datum plane 555.2 555.19
dead end 390.10
dead end bus ways 368.58
dead ends wireways 376.58 378.58 390.10
dead-front 551.2
dead-front assemblies 110.26A(1)a
dead front switchboards 250.174B
dedicated equipment space 110.26F
deflected 376.23A
deflected conductors 376.23A
deflecting cables 300.19B(3)
dehydration 503.1
deicers 300.6D FPN
deicing branch circuits 426.4
deicing equipment receptacle 210.8A(3)
delta breakers 408.36E
delta-connected 250.188A 250.20B(3)
delta-delta transformers 240.4F
delta transformer corner grounded 250.20FPN
derating factors 310.15B(2)a
derived neutral 250.182
derived phase conductors 250.30A1
derangement 700.7A
designated polarity not to be reversed 200.11
design specifications not intended 90.1C
destructive fill 330.12
detached garage no receptacle if no power 210.52G
deteriorating effect 110.11
deuce board 530.2
device yoke 250.146A 250.146B
diagram of feeders provided prior to installation 215.5
diameter compact aluminum conductor Chapter 9 Table 5A
diameter of conductor Chapter 9 Table 8
diathermy equipment 517.2
die-cast 314.40B
dielectric heating 665.2
dielectric strength test 1 minute 900 volts 550.17A
different intrinsically safe circuits 504.2
diffraction equipment 660.23B
diffusers 410.4C2
dikes 450.27
dimmer switches 404.14E
diode blocking 690.2
dip tank drawing 516.3B(5)
dip tanks 516.3C(5)
direct current resistance Chapter 9 Table 8
directional boring 300.5K
directory required 225.37 ex. 1
dirt 314.27C ex.
disconnecting means 551.2
disconnects six maximum 225.33
dish antenna systems 810.1
dishwashers 422.16B(2)
dishwasher cord length 3 to 4 feet 422.16B2(2)
dispensers classified locations 514.3
dispensing device motor fuel table 514.3B(1)
dissimilar metals 342.14 344.14
dissimilar metals, connections not intermixed 110.14
distinguishably different 200.6D
distribution apparatus 250.110 ex.2
distribution centers 90.8A
distribution panelboard 550.2 551.2
distribution point 550.2
ditch back fill 300.5F
diversion charge controller 690.2
diving platform clearance table 680.8
diving tower clearance table 680.8
docks 513.7E
documented safe switching 225.30E
domed covers fill calculation 314.16A
donut type current transformer 450.5A(3) FPN
doors opening 90 degrees 110.32
double ended services 250.24A(3)
double insulated 250.114 ex.
double insulated pool pump 680.21B
double lock nuts 250.97ex.2
double pole switched lampholders 410.48
double throw 404.6B
draglines covered 110.51A
drain arranged for raceways on exterior 225.22
drain for raceways 230.53
drain holes 1/4 to 1/2 inch 600.9D
drain plugs 368.236
dredges covered 110.51A
dressing rooms 530.31
drills in tunnels over 600 volts covered 110.51A
drip loop 230.24B (1) 230.54F
drip proof enclosures tunnels 110.59
driveways clearance service 18 feet 230.24
drop box 520.2
dropped ceilings 400.8 (5) 424.41A
drums 250.136B
dry board installation heating cable 424.41G
dry location conductors 310.8A
dry location 90 degrees centigrade table 310.13
dry partitions 380.3
drywall 314.21
dual fed services 250.24A(3)
duct bank drawings 310.60
duct heaters 424.67
ducts for dust 300.22A
dumbwaiters 620.1 620.5A (1) 620.2 100
dumbwaiters branch circuit 620.61
duplex messenger supported 396.2 (4)
dust 300.22A
dust ignition proof 500.2
dusttight 500.2
duty cycle service table 430.22E
dwelling unit optional calculation 220.30
e protection type 505.8A
earth itself 250.2 FPN
eccentric knockouts (same edge point) 250.92B 250.97
edge of the roof service clearance 230.24A
Edison base fuse 30 or less 240.51A
Edison base lampholder 422.40
effective grounded metal faceplates in receptacles in RV's 551.47M
effective ground-fault current path 250.2
effective grounding path 250.68B
effective Z definition Chapter 9 Table 9 Note 2
effective Z for aluminum wires Chapter 9 Table 9
effective Z for uncoated copper wire Chapter 9 Table 9
efficient, not necessarily 90.1B
egress 110.26C2 410.73E4
ejector mechanisms 406.6C
elbow metal 250.86 ex.3
electric shock protection 90.1D FPN
electric vehicle Table 400.4 625.2
electric vehicle inlet 625.2
electric vehicle nonvented storage battery 625.2
electrical area classifications table 515.3
electrical datum plane 555.2
electrical duct drawing 310.60
electrical ducts 310.60A
electrical equipment 500.2
electrical life support equipment 517.2
electrical noise 250.96B 406.2D
electrical production network 690.2
electrical ranges calculations 210.19A(3)
electrically connected 200.3 210.19
electric signs branch circuits 600.6
electric utility, not covered 90.2B(5)
electric vehicle cable type EV table 400.4
electrocution 422.41
electrode spacing greater than 6 feet 250.56FPN
electrode type boiler grounded 250.142B ex.4
electroendosmosis 310.13 FPN
electrolyte cell 668.2
electrolysis of the sheath 110.36
electrolytic cell line working zone 668.2
electrolytic cells feeders 668.3C1 215.1
electromagnetic induction is not electrically connected 200.3
electromagnetic interference 250.96B 406.2D
electronic actuated fuses table 450.3A Note 4
electronic equipment 500.2
electronic equipment voltage drop 1.5 2.5 overall 647.4D
electroplating tank 669.5
electrostatic 422.12 ex. 516.10A(2) 516.10B 516.10C
elevator branch circuit 620.61
elevator cable type E table 400.4
elevator single line diagram drawing 620.13
elevator trailing cable table 400.4 note 5
elliptical cross section cable Chapter 9 table 8 Note 9
embedded cables 424.40 424.41D
embedment 314.23G
emergency system 517.2
emerging from grade to 8 feet 300.5D(1)
EMT electrical metallic tubing type 358
EMT minimum 1/2 maximum 4 inch 358.20
enamel 250.12 250.96A 300.6A(1)
encapsulated in 680.23B(4) 680.26B(1)
encapsulation "m" 505.2
end-cap 322.40A
end to end connection of fixtures 410.32
engineered cabling system 300.50C ex.
engineering supervision ampacity calculation Annex B
ENT electrical nonmetallic tubing type 362
ENT minimum 1/2 inch maximum 2 inch 362.20
entrance/egress 210.52E
envelope ferromagnetic 426.2
equipment grounding conductors table 250.122
equipment rack 640.2
equipment system 517.2
equipotential plane 550.2
escalators 620.5A
escalators branch circuits 620.61
escutcheon area 240.83B
essential electrical system 517.2
ethyl ether 500.6A3
ethylene gases 500.6A3
evenly proportioned load 210.11B
example problems/calculations Appendix D (back of the book)
excelsior 500.5D(1) FPN2
excitation conductors over 600 volts 300.3C(2)c
excrement 547.1B
existing dwelling additional loads 220.16A
exothermic welding 250.64C(1) 250.8
expansion fittings 250.98 300.7B 352.44
expansion joints for heat panels 424.98C
explanatory material FPN 90.5C
explosion proof apparatus 500.2
exposed conducting surfaces 517.2
exposed live parts both sides condition 3 110.26A(1)
exposed live parts one nothing other condition 1 110.26A(1)
exposed live parts one side grounded other 110.26A(1)
exposed terminals 406.4F
extra working space 110.26C(2)b
faceplates 404.9A
face-up position 406.4E
factory elbow 342.6
factory-wired 430.7D(1)
fairs 640.3G
fan circuit interlock 424.63
fan interlock circuit 424.63
farm load 220.102
farm load demand factors table 220.102 220.103
farm loads service size method 220.102
farm load total table 220.103
fat 500.5B(1) FPN5
fault closing rating 225.53
fault-closing rating disconnect 230.205B
fault current protection 90.1D FPN
fault hazard current 517.2
fault tolerant external control conductors 695.2
FC flat cable assemblies type 322
FCC system 324.2
feeder assembly 550.2
feeder for generator example calculation Appendix D9
feeder neutral 220.22
feeder taps 240.21B
feed-through conductors 312.11D
fence fabric 110.31
fences 250.190
ferromagnetic 300.20A ex2
ferromagnetic envelope 426.2 427.48
ferrous metal 250.52A6 404.9C
ferrous (steel) 344.2
fertilizer 300.6C FPN
festoon 410.27 520.65
fiber board surface mounted fixture 410.76B
fibers and flyings Class III 500.5D
field assembled breaker in parallel no 240.8
film perforations 540.2
film storage vault 530.51
filter drains 368.236
final spans 225.19D
final span overhead conductors 225.19D
fine print note FPN 90.5C
fire alarm cable abandoned 760.2
fire alarm circuit 760.2
fire alarm circuit integrity cable 760.2
fire barriers 368.234B
firedamp 505.6 FPN
fire dampers transformer vault 450.45E
fire escape 255.7C 314.23H2
fire escapes clearance for service 230.9A
fire ladders 225.19E
fire ladder zone to raise ladders 225.19E
fire rating 3 hours 110.31A
fire resistance ratings Annex E
fire stopped 300.21
fire wall 368.234B
first make equipment grounding 250.124
fish 547.1A
five threads fully engaged 505.9E
fixed appliance 550.2
fixed appliance 75% 4 or more 220.17
fixed ladders corrosion resistant 110.79
fixed panels need receptacles 210.52A(2)
fixed trip circuit breakers 240.6A
fixture arms 410.28C
fixture conductors within 3 inches of ballast 90 degree 410.33
fixture stems no splices 410.28C
fixture studs steel 410.16D
fixture wire ampacity taps 240.5B(2)
fixture wire application provisions 402.3
fixture wire dimensions Chapter 9 Table 5
fixture wire insulation table 402.3
fixture wire insulation thickness table 402.3
fixture wire name table 402.3
fixture wire outer covering table 402.3
fixture wire specifications table 402.3
fixture wire table 402.3
fixture wire type letter table 402.3
flameproof "d" 505.2
flameproof protection type 505.8
flammable anesthetics 517.2
flammable anesthetizing locations 517.2
flammable gases or vapors Class I location 500.5B
flared entry 300.4F ex.
flashers 404.5 600.6B
flash protection 110.16
flatiron 422.46
flax 500.5D(1) FPN 1
flexible cord and cable derate table 400.5
flexible cords and cable ampacity table 400.5A
flexible cords and cable table 400.4
flexural capability 426.21D 427.17
floating buildings 90.2A
floor box 250.146C 314.27C
floor receptacle counts as wall receptacle 18in or closer 210.52A(3)
flue 450.24
fluorescent fixture in closet clearance 6 inches 410.8D4
fluoroscopic equipment 660.23A
flush deck box 680.24A(2)
flush position 312.3
FMC flexible metal conduit type 348
FMT flexible metallic tubing type 360
footlight 520.2
foot switch 665.7B
forbidding 110.27C
forced cooled bus 368.234A ex.
foreign materials-paint, plaster, cleaners, abrasives 110.12C
foreign system 110.26F (1)b
forest 230.24B(4) 225.18(4) 830.44D(3)
forest clearance service 18 feet 230.24
forming shell 680.2
fountain 680.2
four and eleven sixteenths box dimensions table 314.16A
four quarter bends equals 360 degrees 348.26
four square box dimensions table 314.16A
four way switches 404.2
FPN fine print note 90.5C
fraction major .5 or larger 220.5B
frame 551.2
framing members 314.23 D1
free air ampacity table 310.17
free conductor 6 inches 300.14
free from shorts or grounds 110.7
free-standing bar-type counters 210.52A(2)
freezing of piping 422.50
frost 300.50B 300.5J
frost heaves 300.5J FPN
FD box standard dimensions table 314.16A
FS box standard dimensions table 314.16A
fuel cell 692.2
full shoe bender table Chapter 9 Table 2
fungus 334.116B
fused switches 404.17
fuses in parallel 240.8
future increases, FPN 90.1B
gallery, location live parts 110.27A(3)
galvanic action 342.14
garage cable table 400.4 note 4
gasoline dispensers drawing 514.3
gas piping 250.104B
gas piping system 250.52B(2)
gas pressure 326.40
gastight 332.2
general lighting demand factors 220.12
generating plant not covered 90.2B|
generator terminals conductors 240.21G
glass or porcelain knobs, racks, brackets 225.12
glue houses 300.6D FPN
goosenecks in service 230.54C
grain 220.102A 500.6B(3)
granulated soil 314.29 ex.
granular material 100
gravel 314.29 ex
gravity 404.6A
gravity not close knife switch 404.6
gray color may have been used as ungrounded in past 200.7C (3) FPN
gray color grounded 200.6 400.22 322.120A 520.53H
grazing 230.24B(4) 225.18(4)
grazing land clearance service 18 feet 230.24B(4)
grease, cooking 410.4C(2)
grid ceiling 300.11A
grommets protect NM cable 300.4B(1)
grooves 400.22F
ground detector 250.36 (3)
grounded single phase 240.20B(2)
grounded, concrete, brick or tile walls 110.26A (1)
ground-fault current path 250.2
ground fault definition 250.2
ground fault protection maximum 1200 maximum time 230.95A
grounding drawing 250.4
grounding electrode conductor table 250.66
grounding requirements table 250.3
grounding symbol drawing 250.126
grounding type receptacle drawing 551.46C
ground return 110.19
ground ring 250.52A 4 250.53F 250.166E
Group A Locations 500.6A(1)
Group B Locations 500.6A(2)
Group C Locations 500.6A(3)
Group D Locations 500.6A(4)
Group E Locations 500.6B(1)
Group F Locations 500.6B(2)
Group G Locations 500.6B(3)
grouped 520.2
grouping of disconnects 230.72
guest room receptacle placement 210.60B
guest rooms in hotels motels receptacle placement 210.60A
guide rail fasten 620.34
guys as support for mast 230.28
gymnasiums 680.60
gypsum wall or ceiling 314.20
habitable rooms 210.8A5
HDPE high density polyethylene conduit type 353
hair dryer hand held 422.41
hallway 10 foot or more must have at least one receptacle 210.52H
handhole 410.15B (1)
hand hole for metal pole light 410.15B
hand lamps 250.114(3)E
hand lamps portable 410.42B
handle tie 225.33B
handy boxes (4X2 1/8X) standard dimensions table 314.16A
hangar, aircraft 500.9
hanging rod in closet 410.8A
hard conversion 90.9C 90.9D FPN 1
hard drawn copper 810.11
hard service cord type S table 400.4
harmonic currents in neutral 310.15B (4)c
hazard current 517.2
header 372.2 374.2
headroom 110.26E
health care facilities 517.2
heat generated 310.10 FPN1 (2)
heat pump 220.82C
heated area maximum 33 watts/sq ft 424.98A
heated area under floor covering max 15 watts/sq ft 424.99B
heated ceiling 424.36
heated floor FCC 324.10F
heater cord type HPD table 400.4
heating elements resistance panels not exceed 120 watts/sq ft 426.20
heating cable, adjacent runs 424.41B
heating cable resistance type 426.2
heating equipment 665.2
heating panel 424.91
heating panels resistance type 426.2
heating systems 426.2
heavy-duty lampholder 660 watts admedium 750 other type 210.21A
heavy duty lampholders minimum 600VA 220.14E
heavy duty lighting track 410.103
hedge clippers 250.114(3)d
helically wound 348.2
hemp 500.5D(1) FPN 2
henequen 500.5D(1) FPN 2
hermetically sealed 500.2 500.7J
hexagonal configuration (six sided) 240.50C
hexagonal head (six sided) 250.126 (1)
hexagonal-headed (six sided) 406.9B(1)
hickeys 314.16B (3) 410.16D
hides (animal) 300.6C FPN
HID switches high-intensity discharge 240.83D
highest position 6' 7" 240.24
high harmonic neutral current in nonlinear loads 210.4A
high impedance 250.24C(3)
high-impedance grounded neutral 250.36
high impedance shunts connected to supply side 230.82(4)
high-leg marking orange 110.15
high voltage more than 600 volts 490.2
highway 300.5
hinged base metal pole light 410.15B ex.2
hinged panels 90 degrees 110.32
hinged pole 410.15B4
hoists in tunnels over 600 volts covered 110.51A
hoists branch circuit 610.41A
holiday 590.3B
holiday decorative lighting 590.3B
hook-stick 404.8A ex 3
horizontal separation 300.21 FPN
hosed down 300.6D
hospital 517.2
hospital grade 517.18B FPN
hospital transfer switch drawing 517.30
hotel guest room 210.6A
hot tub 5 feet to switch 680.43C
house load for common area 220.84B
humidifiers 422.12 ex.1
hung ceiling 300.22C FPN
hybrid system 690.2
hydrochloric acid 330.12(4)
hydrogen 500.6A2 FPN
hydromassage bathtub 680.2
hydrotherapeutic tanks 680.62
hysteresis 300.20B FPN
IC insulated ceiling fixture 410.66A(2)
ice 810.16B
ice loading 810.16B
icing 430.91
identification with permanent plaque 225.37
IEC International Electrotechnical Commission Standard 90.1D
IGS integrated gas spacer cable type 325
illumination 110.26D
IMC intermediate metal conduit type 342
immersion 422.11F(3)
immersion "o" 505.2
impact resistant pool light fixture 680.33A(3)
impedance 110.10
impedance for aluminum wires Chapter 9 Table 9
impedance for uncoated copper wire Chapter 9 Table 9
impedance grounded 250.2 285.3(2) 280.4A(4) 408.3C ex.
200.2 430.95 ex.
impedance heating system 426.2 427.2
impedance Z table Chapter 9 Table 5
increased safety "e" 505.2
indicating type circuit breakers 240.81
indicative 230.77
induction heating 665.2
inductive effects 408.3B
inductive load 600.6B
individual meter socket enclosures 230.66
inductance heating system 427.2
industrial electric furnaces grounding 250.21
industrial machinery 670.2
industrial manufacturing system 670.2
industrial premises neutral 20 percent 250.184D(1)ex.
industrial substations 90.2A
information technology branch circuits 645.5A
inlet bushing 410.30A
interlocks 620.11A
infrared heating branch circuit 422.48 424.3A
inrush current 430.52C 3 FPN
inserts 374.10 372.9
insulated conductors dimensions Chapter 9 Table 5
insulating bushing temperature not less than 300.4F
insulation thickness for fixture wire table 402.3
integral fluorescent ballast protection 410.73E(1)
interactive system 690.2
international standards 90.1D
interstices voids between strand wires tableC3A Note Appendix C
inverter 690.2
inverter input circuit 690.2
inverter output circuit 690.2
instruction manual, NEC not intended as (really!) 90.1C
instrument transformers connected to supply side 230.82
instrumentation 500.5B1 FPN
insulated fitting 4 AWG and larger 300.4F
insulating end FCC 324.2
insulation equivalent to conductor 110.14B
insulation for fixture wire table 402.3
insulation type table 310.13
insurance inspectors 90.4
integrated heating system 427.2
interactive system
interchangeability 240.54E
interior stairways switch each floor 210.70A 2C
interlocked 440.62C
interlocks mechanical 490.45B
intermediate-base pendant conductors 18AWG or larger 410.27B
international system of units SI 90.9A
interrupting rating 240.83C
intrinsically safe 504 505.2 506.8C 376.10(3)
517.64A(2)
intrinsically safe circuit 504.2
intrinsically safe table 250.3
intrinsic safety 500.7E
intrinsic safety "i" 505.2
iron box malleable 314.40B
irradiated 690.18FPN
irradiation equipment 660.23B
irrigation machine 675.2 675.15
island counter space needs at least one receptacle 210.52C 2
isolated equipment grounding conductor 250.96B FPN
isolated ground 406.2C2
isolated ground circuits 250.96B
isolated grounded receptacles 406.2D
isolated power systems 517.2
isolated receptacles 250.146D
isolating switch 225.51 ex 404.13
isolation transformer 426.31 517.2
istle 500.5D1 FPN2
ITC instrumentation tray cable type 727
jacketed cord 400.22C
jamming of conductors in raceways Chapter 9 table 1 FPN2
jars 480.6B
jet system for spa 680.41
joists 424.41I
judging electrical equipment 110.3A
junction point needs box 300.15
junior hard service cord type SJ table 400.4
jute 500.5D1 FPN2
kapok 500.5D1 FPN2
kitchen equipment commercial demand 220.56
knife switch 404.6
knobs porcelain 225.12
knotting the cord 400.10 FPN
kraft paper 326.112
kraft paper tape 326.112
labeled equipment 110.3B
lacquer 250.12
lakes crossing clearance 225.60C
lamp cord type C table 400.4
lamp replacement 410.82
landscape lighting receptacle 406.8B(2)
large equipment over 600 volts 110.26C(2)
last break equipment grounding 250.124
laundries 300.6D
laundry area 550.2
laundry circuit load 1500VA 220.52B
lawn mowers 250.114(3)D
lay-in wire terminals table 312.6B note 2
LCDI leak current detection and interruption 440.65
lead in clearance 820.44B
leakage 110.26F2
leak protection apparatus 110.26F1a
legally required standby systems 701.2
letter W for white 200.10B2
LFMC liquid tight flexible metal conduit type 350
LFNC liquid tight flexible nonmetallic conduit type 356
life safety branch 517.2
light blue 400.22C 504.80C
lighting track fastening 410.104
lightning arrestor shall be 230.209
limit potential 250.60FPN2
limited care facility 517.2
limited smoke 352.120 FPN
limiting circuits minimizes short circuits 90.8B
line isolation monitor 517.2
line surges 250.4A1
line terminals interrupting rating 110.9
line-to-line 240.20B(2)
line-to-neutral loads 240.20B1
linoleum 390.2A
liquid spillage FCC 324.40A
liquified natural gas table 514.3B(2)
liquified petroleum gas table 514.3B(2)
listed equipment 110.3B
live-front switchboards 250.174C
live parts 312.11A(3)
live parts balcony locations 110.27A(3)
live parts of fixtures 410.3
live parts working spaces T110.26A1
livestock 547.1A
load diversity 310.15B2 FPN
load ends of the service drop 250.24A1
load management devices 230.82(4)
load-side equipment 250.142B
location board 530.2
locked rooms 110.34C
locked rotor code letters table 430.7B
locked service 230.92
locking device knife switch 404.6B
locking doors for service 230.62B
lock nuts, bonding type 250.92B(4)
long time pickup setting 240.6B
long time rating x ray 660.2
long time x ray 5 minutes or longer 517.2
loop wiring 390.7
loose stock 300.22A
lots covered 90.2
loudspeaker 640.2
low-impedance circuit 250.4A5
low-smoke-producing-characteristics 300.22C(2)
low voltage 24 volts or less 551.2
low-water cutoff 680.51D
LS limited smoke 352.120FPN
lubrication motor fuel table 514.B(1)
lubrication pit 511.3A(4)
lubritoriums 514.2 FPN
luminaire maximum weight 50 pounds 314.27B
luminaires 277 volt 210.6C
m protection type 505.8G
machine shops, covered 90.2A(4)
machine tool wiring table 310.13
magnesium dust 500.6B1 FPN
magnetic forces 110.36
main bonding jumper wire, bus, screw 250.28A
main power feeder 310.15B(6)
maintenance 90.1B
major diameter of ellipse as circle Chapter 9 Table 8 Note 9
major fraction .5 or larger 220.5B
malleable iron 250.70(2) 314.40B
mandatory application 90.4
mandatory rules - shall 90.5A
manhole access 110.75D
manhole 100 pounds 110.73 110.75D
manufactured building 545.3
manufactured home 550.2
manufactured phase 455.2
marina branch circuits 555.19
marine receptacle demand factors table 555.12
marine terminal drawing 515.3
marine terminal flammable liquids drawing 515.3
marker tape 310.11B (2)
marking shall encircle the conductor if grounded 200.6B
master handle 225.33B
masonry box standard dimensions table 314.16A
mast as support for service 230.28
material handling magnet 240.4A
maximum cord and plug connected load to receptacle 210.21B(2)
maximum demand for 1-year optional calculation 220.87(1)
maximum operating temperature for fixture wire table 402.3
maximum system voltage 692.2
maximum water level 680.2
MC metal clad cable type 330
MCI minimum igniting current ratio 500.6A(3)
means of attachment 225.16B
meat packing plant 300.6D FPN
mechanical interlocks 490.45B
mechanical strength 110.3A(2)
medium-base pendant conductors 14AWG or larger 410.27B
medium base 410.53
medium drawn copper 810.11 ex.
megohm 516.10A4
MESG maximum experimental safe gap 500.6A(2)
messenger supported wiring feeders 225.10
metal air ducts 250.104B FPN
metal boxes standard dimensions table 314.16A
metal boxes table 314.16A
metal canopies specifications 410.38B
metal cased socket 590.4F
metal ducting 250.2 FPN
metal elbow 250.80 ex. 250.86 ex.3
metal enclosed switchgear 230.211
metal frame of a building 250.52A(2)
metal lath 424.41C
metallic plugs with nonmetallic enclosures 110.12A
metal oxide arrester 280.4B FPN2
metal sheaves 250.136B
metal shield connections FCC 324.2
metal supported wire 396.2
metal tape armor 330.116
metal water pipe 250.52A(1)
metal wireways 376.2
metric designator 300.1C 314.28A1
metric designator equivalents table 4 Chapter 9
12 3/8
16 1/2
21 3/4
27 1
35 1 1/4
41 1 1/2
53 2
63 2 1/2
78 3
91 3 1/2
103 4
129 5
155 6
metric designator table 300.1C
mezzanine floors 110.33B
MI mineral insulated cable type 332
middle phase B 408.3E
milk 500.5C(1) FPN
mines not covered 90.2B
minimum size conductors 230.23
minimum size conductors table 310.5
minimum size feeders 215.2A
mining operations clearance 225.60C
mixer 640.2
mixer amplifier 640.2
mobile home 550.2
mobile home example calculation Appendix D11
mobile home lot 550.2
mobile home optional calculation table 550.18C
mobile home park 550.2
mobile shovels covered 110.51A
mobile stanchions 513.7F
mobile x ray 517.2 660.2
module 690.2
mogul 410.53
mogul-base 410.27B
mogul base 1500 watts 410.53
mogul base pendant conductors 14AWG or larger 410.27B
molded case circuit breakers 240.85 FPN
momentary rating x ray 660.2
momentary rating x ray not exceed 5 seconds 517.2
monitor hazard current 517.2
monitoring system 240.12(2)
monorail 610.14G
motel guest room 210.6A
motion picture studio 530.2
motor aspects diagram 430.1
motor circuit aspects example calculation Appendix D8
motor circuit taps 240.20F
motor control center illumination 110.26D
motor design letters BCD 710.14C(1)a4
motor fuels table 514.3B(1)
motor full load current AC 1 phase table 430.248
motor full load current DC table 430.247
motor full load current three phase table 430.250
motor home 551.2
motor maximum protective devices table 430.52
motor nameplate values 430.6A(2)
moving walks 620.5A
moving walks branch circuit 620.61B(2)
multi circuit track equally divided 220.43B
multi conductor flat #4 AWG or larger 200.6E
multi element antenna systems 810.1
multi family dwelling example calculation Appendix D4(a)(b)
multi family dwelling optional calculations 220.84
multi family dwelling 208Y/120 three phase example calculation Appendix D5(a)
multi family dwelling optional 208Y/120 three phase example calculation Appendix
D5(b)
multi grounded neutral 33 1/3 percent 250.184A(2)
multi grounded neutral primary systems 280.24B(2)
multi motor 610.43C
multi-outlet assemblies 220.14H
multiple electrodes not less than 6' apart 250.56
multispeed motors 430.7B(1)
multi wire branch circuits 240.20B(1)
MV medium voltage cable 328
n protection type also nA. nC, nR 505.8D
nails for heating panels 424.93B(3)
name for fixture wire table 402.3
nameplate values for overloads 430.6A(2)
natural gas table 514.3B(2)
NEC not a design specification 90.1C
negative impact 90.9C(4)
neon tubing 600.1 FPN 600.2
neon secondary circuit 600.32
network powered 830.47E
neutral 310.15B(4)
neutral as current carrying 310.15B(4)c
neutral conductor 70% All cases
neutral conductor not less than 33 1/3% high voltage 250.184A(2)
neutral conductor carries unbalanced load 310.15B (4)a
new restaurant optional calculations 220.88
nickel coated copper 332.104
nipple 24 inches or less 60% no derate Chapter 9 Note 4
NIST National Institute of Standards and Technology
NM nonmetallic cable type 334
NM 334.10A 334.116A
NMC 334.10B 334.116B
NMS 334.16C 334.116C
nominal battery voltage 480.2
nominal voltage 110.4
no niche fixture 680.2
non absorbent 410.39
non bridge structures 225.19B
non building structure clearance 3 feet 225.19B
non coincident loads use larger 220.60
non continuous load overcurrent device 210.20A
non ferrous 250.52A5b
non ferrous metal 404.9C
non ferrous wiring methods 300.3B(3)
non grounding type receptacles replacement 406.3D(3)
non heating leads 424.35 424.43A 424.97 426.23A 427.18A
non heating leads deicing and snow melting 210.19A(4) ex. 1e
non incendive circuit 500.2 500.7F
non incendive component 500.2 500.7H
non incendive equipment 500.2 500.7E
non incendive field wiring 500.2
non incendive field wiring apparatus 500.2
non inductive loads 404.14D(1)
non interchangeable type receptacles 406.3F 406.7
non interchangeability 406.7
non linear loads 450.3FPN2
non linear loads may have high harmonic neutral 210.4A FPN
non metallic enclosures require no air gap 312.2A ex.
non metallic extension 382.2
non metallic wireways 378.2
non orderly shutdown 215.10 ex1
ohms 25 made electrode 250.56
non power limited fire alarm circuit NPLFA 760.2
non tamperable type S fuses 240.54D
notches in wood 300.4A(2)
not covered by the NEC 90.2B
NPT national pipe thread 500.8D
NUCC nonmetallic underground conduit type 354
nurses station 517.2
nursing home 517.2
nut 250.126(2) 551.56 ex. 552.57B ex.
o protection type 505.8E
oakum 500.5D1 FPN2
objectionable current 250.6E
observation stand clearance table 680.8
occupant access 225.35 240.24B
off premises source 250.164A
offset 312.6B(2) FPN
oil, cooking 410.4C2
oil-filled 410.73C
oil immersion 500.2 500.7I
oil insulated transformers 450.26
oil switches 230.204A
one-circuit installation service 230.79A
one family dwelling example calculation Appendix D1(a)(b)D2(a)
one family optional example calculation Appendix D2(b)
one family optional w/heat pump example calculation Appendix D2(c)
one square foot equals .0930 square meters
on premises source 250.164B
on site generator 250.20D FPN1
on site power production facility 695.2
on site standby generator 695.2
one foot equals .3048 meters Annex D Examples
one mile equals 5280 feet
one shot bender table Chapter 9 Table 2
one square foot equals .093 square meters Annex D Examples
open land clearance table 225.60
open wiring on insulators 398.2 398.30A3
openings to be closed 312.5A
operating handle 240.30B
operating room 160A(4)
operating temperature maximum table 310.13
operations of the hand six maximum 225.33B
opposite polarity in free air table 408.56
opposite polarity on same surface table 408.56
optical fiber cable covered 90.2
optional calculation-dwelling unit 220.82
optional calculation-existing dwellings 220.83
optional calculation-existing loads 220.83
optional calculation-multifamily dwellings 220.84
optional calculation-new restaurants 220.88
optional calculation-schools 220.86
optional calculation-two dwelling units 220.85
optional stand by systems 230.2A 702.2
orange 110.15 230.56 406.2D 424.35 517.160A(5)
orange 480 volts 424.35
orange high leg marking 110.15
orange triangle 406.2D
orchard 230.24B(4) 225.18(4) 830.44D(3)
orchard clearance service 18 feet 230.24B(4)
orderly shutdown 685.1 685.3 685.10 430.44
240.12 table 310.16 620.61B(4)
organic coating 384.100B
outer covering for conductors 310.13
outer covering for fixture wire table 402.3
outdoor lampholders 225.24
outdoor outlets one@front one@back GFCI residential 210.52E
outlet point needs box 300.15
outline lighting 220.14F 600.5A
output circuit 692.2
outside a building under 2" concrete 230.6
outside tap unlimited length 240.21B(5)
overcurrent devices 42 maximum lighting/appliance 408.35
overcurrent protection 90.1D FPN
overhead conductor table 680.8
overhead spans clearance 225.19
overhead spans of conductors 225.6A
overhead spans of open conductors 225.18
overheating deteriorated by, not permitted 110.12C
overload relay table 430.32C 430.52C2
overload units table 430.37
overpressure limit control 424.74
overtemperature 426.21B
overtemperature limit control 424.73
over voltage protection 90.1D FPN
oxide arrester metal 280.4B FPN
ozone 310.6 555.13A(2)
ozone resistant 310.6
packaged spa 680.2
packaged hot tub 680.2
packaged therapeutic tub 680.2
paddle fan 314.27D 422.18
paint 250.12 250.96A
paint foreign material 110.12C
paired units fixture sections 410.77C
panel 690.2
panelboard 42 overcurrent devices 408.35
panelboard wire-bending space 408.55
panic bars 110.26C(2) 110.33A
pantry receptacle not required 210.52A
paper kraft 326.112
paper lined 410.42B1
paper lined sockets 590.4F
paper tape kraft 326.112
parallel conductors 1/0 and larger 310.4
parallel conductors 250.24C2
paralleled fuses 240.8
park electrical wiring systems 550.2
park trailer 552.2
park trailer example calculation Appendix D12
parking lot, covered 90.2A(2)
partition interconnections 605.4
path for fault current 250.4B(4)
patient bed locations 517.2
patient care areas 517.2
patient equipment grounding point 517.2
patient vicinity 517.2
pedestrian traffic over roof surfaces 225.19A ex.1
pedestrians 600.9B
pendant 410.27
pendant boxes 314.23H
pendant cord 410.30A
peninsular counter space needs at least one receptacle 210.52C2
perforations 540.2
performance area 520.2
permanently installed decorative fountain 680.2
permanent mold cast aluminum box 314.40B
permissible alterations limits 250.6D
permissive rules - shall be permitted 90.5B
perpendicular 250.52A1 ex.
petroleum gas table 514.3B(2)
PF power factor equals cosine of theta Annex D Examples
phase arrangement ABC left to right top to bottom 408.3E
phase converter 455.2
phase current in autotransformer 1/3 neutral current 450.5
phase to phase solidly grounded wye 230.95
phase voltage 110.15
phase voltaic array bipolar 690.2
phase winding 110.15
photovoltaic drawing 690.1A
photovoltaic output circuit 690.2
photovoltaic power source 690.2
pickup setting 240.6B
pilot lights 408.52 409.2
pins 406.6A
pipe electrode 25 ohms or less 250.56
pipeline 427.2
pipeline branch circuits 427.4
pipe organ branch circuits 650.7
pipe organs 250.112B
pit 620.24C
pits for pool equipment 680.11
pits in lubrication room 511.3A(4)
plain iron 250.70
plaque 225.37
plaque required 225.37 ex.1
plaster 314.21
plasterboard 314.21
plaster foreign material 110.12C
plate electrode 250.52A6 250.53H
plate electrode 25 ohms or less 250.56
platform elevated, location live 110.27A(3)
plenums for environmental air 300.22
pliable 362.2
plug ejector mechanism 406.6C
plug fuse replacement only 240.51B
plugged raceway seal 300.6G
plugging box 530.2
pneumatic circuit breakers 240.80
point of attachment 225.16
point of attachment 10 feet 230.26
point of common coupling 692.2
point of entry to attic needs switch 210.70C
polarity 422.40
polarization 324.40B 382.56
polarized attachment plugs terminal identification 200.10A ex.
polymeric braces 314.23B(2)
polymeric lens pool light fixture 680.33A(3)
polyvinyl chloride 300.7B FPN
pool 680.2
pool cover electric 680.27B
porcelain 314.41
porcelain knobs support open conductors 225.12
portable appliance table 400.4
portable equipment 520.10 640.2
portable hand lamps 410.42B
portable power cable type GE table 400.4
portable power distribution limit 520.2
portable x ray 517.2 660.2
positive means 625.9D
potential coils 408.52
potential transformers 250.174B 408.52
potting compound 680.23B(2)b
poultry 547.1A
poured concrete 410.73F(3)
powder filling "q" 505.2
power limited fire alarm sources Chapter 9 Table 12(A)(B)
powered loudspeaker 640.2
power factor Chapter 9 Table 9 Note 2
power factor 100% lighting load cos theta 220.12 FPN
power failure 404.11
power limited fire alarm circuit PLFA 760.2
power loss hazard 240.4A
power operable 230.76
power operable switch 225.38A
power panelboard 10% or less lighting and appliance 408.34A
power poles 384.10
power supply assembly 351.2
power supply cord 21 feet to 36 1/2 feet 550.10D
practical safeguarding 90.1A
premises wiring 200.3
pressure plates 110.26C2 110.33A
prewired raceway assemblies 300.18A
printed tag for cable 400.6A 402.9A
product safety standards UL Annex A (back of the book)
professional projector 35-70mm 5.4 perforations/inch 540.2
projector professional 35-70mm 5.4 perforations/inch 540.2
prongs 406.6A
proscenium 520.2
protection against 90.1D FPN
protection designation table 505.9C(2)(4)
protection of flexible cords, cables 240.5
protection of fixture wire 240.5
protection type "n" 505.2
prudence 500.5B(1) FPN
psychiatric hospital 517.2
public spaces GFCI receptacle required 210.8B
public street clearance service 230.24B(4)
pull at joints 400.10
pull at terminals 400.10
pull point needs box 300.15
pull wire not code
pump in tunnels over 600 volts covered 110.51A
purged and pressurized 500.2
PVC polyvinly chloride 300.7B FPN
q protection type 505.8H
quadruplex messenger supported 396.2 (4)
quadruplexed 392.12
raceway seal 230.8
racked conductors 314.28B
racks support open conductors 225.12
radio antenna clearance 3 feet 225.19B
radio equipment Chapter 8
radiographic equipment 660.23A
radius of conduit bends table Chapter 9 Table 2
raft clearance table 680.8
rail clearance table 225.60
railway conductors 110.19
raintight service head 230.54A
raised floors information technology 645.5D
range dryer cable type SRD table 400.4
range frames existing grounded 250.142B ex.1
range load example calculation Appendix D6
range receptacle 210.21B(4)
rated load impedance 640.2
rated output power 640.2
rate heat dissipates 310.10 FPN (3)
rate schedule allow additional services 230.2D
rayon 500.5D(1) FPN2
reactance X(sub L) for all wires Chapter 9 Table 9
receptacle configurations 551.46C
receptacle configuration drawing 550.10C
receptacle demand non-dwelling first 10,000 100% bal 50% 220.13
receptacle outlets 180VA single 220.14I
receptacle part of a luminaire 210.52
receptacle ratings for various size circuits 210.21B(3)
recirculation system for spa 680.41
reclose 430.225C(2) 490.72B
recognized time 240.92
recreational vehicle 551.2
recreational vehicle park 551.2
recreational vehicle site 551.2
recreational vehicle site demand factor table 551.73
recreational vehicle stand 551.2
red 322.120C 424.35 517.160B(1)
red non heating lead 240 volt 424.35
reference grounding point 517.2
reference standards 500.4B
refractory 332.2
refrigerator 250.114(3)a
reinforcing steel 250.2 FPN 250.52A(3)
relative analgesia 517.2
remote control for service 230.70A(3)
remote control service disconnect 230.205C
remote pump motor fuel table 514.B(1)
removable sides of a box 314.71C
removable truck panels 230.204A ex.
removable wire terminals table 312.6B note 2
removal of a receptacle 250.148B
renewable cartridge fuses class H 240.60D
replacement ballasts 410.73E1
replacement only plug fuses 240.51B
reproduction 376.56
resistance elements 424.22B
resistance of electrode 25 ohms or less 250.56
resistance table Chapter 9 Table 5
resistive heating element 426.2 427.2
restricted access definition 240.6C
rest room motor fuel table 514.3B(1)
returning conductor 3-way or 4-way not white or grey 200.7C(2)
reverse the designated polarity 200.11
rheostats 430.82C
Rho 310.60A
Rho thermal resistivity values Annex B (back of the book)
Rho concrete 55 resistivity value Annex B
Rho damp soil 60 resistivity value Annex B
Rho paper 550 resistivity value Annex B
Rho polyethylene 450 resistivity value Annex B
Rho polyvinyl chloride 650 resistivity value Annex B
Rho rubber 500 resistivity value Annex B
Rho soil 90 resistivity value Annex B
Rho very dry soil 120 resistivity value Annex B
ridge located on exterior of grounded conductor 200.6A4
ridges 400.22F
rigid metal conduit supports table 344.30B(2)
rings and saddles 396.2(1)
rigid nonmetallic conduit supports table 352.30B
rising warm air to dissipate 110.13B
rivers crossing clearance 225.60C
rivets to fasten enclosure 314.23D (1)
RMC rigid metal conduit type 344
RNV rigid nonmetallic conduit type 352
road clearance service 18 feet 230.24B(4)
road show 520.50
roadway clearance 225.60
roadway clearance table 225.60
rocks 300.5F
rock surface 300.50A ex.6
rod electrode 25 ohms or less 250.56
rolling stock, not covered 90.2B3
roof clearance slope 4-12 3 feet 230.24A ex.2
rooftop receptacle GFCI 210.8B(3)
root mean square difference is voltage 100
rostrums 513.7E
rotary phase converter 455.2
rubber jars 480.6C
running threads 342.42B 344.42B
runways610.21A 620.34
safeguarding 90.1A
saddles and rings 396.2(1)
sag 511.10B3
salt 300.6C FPN
sanitizer generator no GFCI 680.44A 680.62A(1)
scatter box 530.2
school optional calculation 220.86
screen 110.31
screw main bonding jumper 250.28A
screw ring 410.38C
screw shell fuse 240.50E
screw shell grounded conductor 200.10C
screw shell support 6 pounds or less 410.15A
screw-shell with leads white or gray 200.10D
screws to fasten enclosure 314.23D(1)
scuttle hole 320.23A
SE service entrance type cable 338
sealants for raceways identified 230.8
sealed battery 480.2
sealed cells 480.2 480.10B
sealed raceway seal 300.6G
sealing compound 550.16D3
sealing doors for service 230.62B
seals in conduit 505.16FPN
search ingenuity 500.5A FPN
seashore 300.6D FPN
secondary circuit 600.7A
secondary conductor motor table 430.23C
secondary tie 250.24A(3)
second fault 250.4B4 FPN
seed 500.5D1 FPN 1
selected receptacles 517.2
self-propelled mobile surface mining machinery 90.2B(2)
separately derived 250.21(2) 250.30A
separately derived systems 250.20D
separate spaces 210.52C(4)
separator colored 400.22D
series rating 240.86
series rating breaker 240.86A
service conductor minimum size residential table 310.15B(6)
service diagram 230.2
service head 230.54C
service lateral conductors 230.30
service mast as support 230.28
service neutral 220.61
services for dwellings minimum table 310.15B(6)
service supports clearance table 230.51C
setscrews 314.23H(2)
sharply angular substances 300.5F
sheath 330.116
sheaves metal 250.136B
sheet metal auxiliary gutter 366.10A
sheet steel box 314.40B
shoe bender 344.24
shooting location 530.2
shore power 555.19A4
short circuit current rating 110.10
short circuited current transformers 110.23
short circuits minimized by limiting circuits 90.8B
short-radius conduit bodies 314.5
shorts and grounds 110.7
short sections of metal 250.86 ex.2 250.132
shovels mobile covered 110.51A
showcase cord connected 410.29
showcases 410.29C
shower area 410.4D
shower space 406.8C 404.4
shower stall threshold 410.4D
show window cable types 400.11
show window lighting 200VA per foot 220.14G2
show window receptacles for every 12 feet 210.62
show windows 220.14G 210.62 410.7 100
shunting 668.14
side rails 392.5D
signal equipment elevator 620.2
signal processing equipment audio 640.2
sign body 600.2
sign lighting 220.14F
SI International System of Units 90.9A
silicone bronze 344.2
silicone trade name table 310.13
sills in transformer vault 4 inches minimum 450.43B
simple apparatus 504.2
simple reactance ballasts 410.73E(2)
simultaneous interruption 230.72B
simultaneous opening of poles 225.38B 230.74
single conductor fill 53% Ch 9 T1
single management 250.32D 225.30 225.32 ex.1
single 90 degree bend 408.55 ex.3
single pole separable connector 530.2
single pole units 230.71B
sinks 210.52C(4) 210.52C(1) ex.
sisal 500.5D(1) FPN2
six disconnects maximum 225.33A
six operations of the hand 230.71B
six times the ampacity 230.208
skating rink 518.2A
skeleton tubing 600.2
skid mounted equipment 250.112K
skin effect 310.15C
skin effect heating system 426.2 427.2
slash rating 240.85
sliding door 680.22A6
slip rings 675.2
S loops 300.5J FPN
small animals 502.128(2)
small appliance branch circuit 1500VA 220.52A
smoke ventilator control 520.49
smoothing iron 422.43 422.45
snap-fit 384.60
snow 210.2 table 250.3 table 250.114(3)d 426
snow blowers 250.114(3)D
snow-melting branch circuit 426.3 426.4
snow melting receptacle not GFCI 210.8A(3)
soffit 600.21E
soft conversion 90.9C
soft drawn copper 810.11 ex.
soil 314.29 ex.
solar cell 690.2
solar photovoltaic system drawing 690.1A 690.1B
solar voltaic systems 690.2
soldered splices 110.14B
solder 250.148E 410.71
solder prohibited in construction of a fixture box 410.71
solid knobs 398.30E
solid rock table 300.5 note 5
solidly grounded neutral 250.184
solidly grounded wye systems 215.10
sound 376.56
sound equipment branch circuits 640.10
sound recording 376.56
SPA 5' to switch 680.43C
space heating branch circuits 424.3
Spanish moss 500.5D(1) FPN2
spark gap 280.24B
speakers underwater 680.27A(1)
special permission 90.2C
specific conductor applications table 240.4G
spider cable splicing block 530.2 530.15D
spillage 110.26F2
splashing chemicals 300.6C(2)
splice point needs box 300.15
spliced conductors 230.46
splices soldered 110.14B
spray area 516.2
spray area drawing 516.3B(1) 516.3B(2)
spray booth 516.2
spray booth drawing 516.3B(4)
spray room 516.2
spray washer 422.49
spreaders for cable 424.44C
sprinkler system controller receptacle 406.8B(2)a
square feet of 600 is one 15 amp circuit 220.14I
square feet of 800 is one 20 amp circuit 220.14I
square foot equals .093 square meters Annex D
stables 300.6D FPN
stage equipment 520.61
stage property 530.2
stage set 530.2
stage set lighting demand table 530.19A
stainless steel 344.2
stairway chair lift 620.5A
stairway lift branch circuit 620.61B(4)
stanchions 513.7E 513.7F
stand alone system 690.2
stand lamp work light 530.2
standard ampere ratings 240.6A
standard circuit breaker ratings 240.6
stand by generator on site 695.2
standby power systems supply side 230.82
standpipes 406.8D
staples for heating panels 424.93B(3)
start-up 455.21
static phase converter 455.2
stationary appliance 550.2
steam boilers 422.11F(3)
steel clips 1/16 inch thick 300.4B(2)
steel framing members 250.2 FPN
steel plate 1/16 inch thick 300.4A(1)(2)
steel tie wires 250.52A(3)
steel wire armor 300.19A ex.
step down transformer 680.23A1
stiffen -10 degrees C 310.13FPN 402.3 FPN
storable pools 680.32
storage battery 480.2
storage cellars 300.6D FPN
storage, do not use working space for 110.26B
store lighting 240.83D
store lighting continuous load 100
straight pull eight times largest trade diameter 314.28A(1)
strain insulators support 225.12
strain-relief 314.23H(1) 368.56B4
stranded conductors 8 and larger 310.3
stranding of conductors Chapter 9 Table 8
stripes 400.22F
strip heaters resistance type 426.2FPN
strip light 520.2
strong chlorides 330.12(4)
strut type channel raceway 384.2
strut type channel size table 384.22
stucco mesh 250.2 FPN
studs 314.16B(3)
studs and wallboard not acceptable 110.31A
subdivided load 422.11F(1) 424.72A, B
subdivided load conductors 424.22E
subdivided load 48 amps or more 424.22B
submersible enclosures over 600 volts tunnels 110.59
submersible pump 250.112L 680.51B
submersion 680.51D
substantially white is grounded 200.10B1
substantially white terminals grounded 200.9
substation 110.31B(1)
substation, covered 90.2A(4)
substations in tunnels over 600 volts covered 110.51A
subtractive-connected 450.5A(3) FPN
suddenly moving parts 240.41
suffix D two insulated parallel 310.11C
suffix M two or more twisted spirally 310.11C
suitability of equipment 110.3A(1)
sulfer hexafluoride 230.204A
sump pump 620.85
sunlight 300.6C91)
sunlight resistant 310.8D 352.120 FPN
sunroom receptacles required 210.52A
supervised industrial installation 240.2 240.90
supervised installations 210.19B(2)
supervised location table 450.3A
supplemental electrode 250.53D2
supply cord 240.5B(1)
supply-side equipment 250.142A
support hardware 300.6A
supports distance between open conductors table 230.51C
surface heating element 422.11B
surface metal raceway 386.2
surface nonmetallic raceway 388.2
surface temperature classification table 500.8B
surge arresters 280.2 230.209
surge arresters connected supply side 230.82(8)
suspended ceiling 314.23D 410.16C
suspended ceilings permitted 110.26Ia ex.
SWD or HID used as switches 240.83D
swimming pool clearances drawing 680.8
swimming pool storable 680.2
switch boxes (3X2X) standard dimensions table 314.16A
switch loops 402.2A ex.
switch point needs box 300.15
T code maximum surface temperature class 505.9D(1)
T slot 406.7
tag marking 310.11B (3)
tank clearance 225.19B
tanneries 300.6D FPN
tap conductors definition 240.2
tap conductors range ovens 210.19A(3)ex.1
tape armor metal 330.116
taper 1 in 16 3/4 inch/foot 344.28
task illumination 517.2
TC type control tray 336
technical power system 640.2
telecommunications 250.70 (3)
telescoping sections 250.98
television antenna clearance 3 feet 225.19B
television studio 530.2
television studio branch circuits table 220.3
temperature rise 30 degrees F 310.10 FPN2
temporary currents 250.6C
tensile stress 501.4B 4
tension 410.28F
terminal bar 408.40
terminal block 322.120C
terminal identification 200.10
termination point needs box 300.15
termination provisions 110.14C(1)
theater stage cable table 400.4 note 4
therapeutic high frequency diathermy equipment 517.2
thermal devices 240.9
thermal effects protection 90.1D FPN
thermal protection 410.73E
thermal protector table 430.32A(2)
thermal resistivity 310.60A
thermal shock 410.4C(2)
thermocouple 336.104B
thermoplastic insulation 310.13 FPN
thermoplastic trade name table 310.13
thermoset trade name table 310.13
thickness of insulation table 310.13
thermostatic control of kitchen equipment 220.56
thermostats 424.20B
thorium dust 500.6B 1 FPN
threadless 342.42A
threadless couplings 250.92B(3) 342.42A
three times the ampacity fuse 230.208
three way switches 404.2
through-the-roof-raceway 225.19A ex3
through-wiring 410.11
tidal high water mark 640.10A
tie circuit 450.6A(5)
tie wires 8 or larger 398.30E
tightening torque FPN 110.14
tile wall grounded 110.26A(1)
time-current protection characteristic 240.92D
time delay 430.42D
time switches 404.5
tinned conductors 400.22E
tinsel cord type TPT 240.5B(1)
tinsel cord table 400.4A note. 240.5
toaster heating element 422.4
top shield FCC 324.2
torqued 430.9C
torque motor 430.110B
total hazard current 517.2
tow 500.5D(1) FPN 2
toxicity 362.100
TP thermally protected 410.73F
tracer 400.22B
tracer in braid is grounded conductor 400.22B
track lighting 410.100
track lighting 150VA per 2 feet 220.43B
trademark 376.120
trade name table for conductors 310.13
trade sizes 90.9C 1
trailer camping 551.2
trailers in tunnels over 600 volts covered 110.51A
trailing cable 250.188F
transfer switch arrangement drawing 517.41
transfer switch automatic 701.7C
transformer rated impedance table 450.3A
transformer secondary conductors 240.4F 240.21C
transient voltage surge suppressors 230.82(8)
transition assembly 324.2
transportable x ray 517.2 660.2
trash compactor cord 3 to 4 feet 422.16B(2)
trash compactors 422.16B(2)
traveling cables 400.4 note 5 620.11B
travel trailer 551.2
trays 480.8B
trees 225.26 410.16H
triplen harmonic currents 310.4 ex 4 FPN
triplex messenger supported 396.2(4)
triplexed 392.12
tripods 410.16D
trolley-type 368.56C
trolley wires 110.19
truck camper 551.2
T-slot receptacle 406.7
tub water 680.62B(2)
tubing fill Appendix C (back of the book)
tubular heaters resistance type 427.2 426.2
tungsten-filament 404.14A(2)
tunnel 110.1 110.59
tunnel floor 110.51C
tunnel portal 110.54A
TVSS transient voltage surge suppressors 285
two-circuit installation service 230.79B
two fer 520.2
two lock nuts 250.97 ex.2
two main circuit breakers 408.36A
two sets of fuses as main 408.36A 215.4A
type IC recessed 410.66A 2
type letter fixture wire table 402.3
type letter table 310.13
type S adapter non-removable 240.54C
type S fuses non-interchangeable 240.53B
types of construction Appendix E (back of the book)
UF underground feeder type cable 340
ultimate insulation temperature 400.5B
ultimate trip current 430.32A(2)
unclassified locations 500.2
uncoated resistance Chapter 9 Table 8
under chassis wiring 550.15H
underground escavators covered 110.51A
underground mines not covered 90.2B(2)
undertground tank motor fuel table 514.3B(1)
underground water pipe metal electrodes 250.52A(1)
underwater speakers 680.27A
unfinished basement 210.8A(5)
ungrounded primary systems 280.24B(1)
uni-grounded primary 280.24B(1)
uninsulated conductors Chapter 9 Table 8
uninterruptible power supply UPS 645.11
unit values 220.12FPN
unlimited length taps 240.21B(5)
unobstructed exit 110.26C(2)a 110.33A(1)a
untrained persons, NEC not a manual for 90.1C
unwired portion 220.16A(1)
ups uninterruptible power supply 640.9B
upstream devices 240.92B2(3)
upstream or downstream 240.92B2(3)
U pull six times 314.28A(2)
upward slant for individual conductors 230.52
uranium dust 500.6B(1) FPN
USE service entrance type cable 338
vacant space 110.31A
vacuum 422.15
vacuum assist blowers motor fuel table 514.3B(1)
vacuum cleaner cord table 400.4
vacuum cleaner cord type SV table 400.4
vapor processing systems parts motor fuel table 514.3B(1)
vapor removal 300.22A
vapor seal 234A
vaults strength 110.71
vegetation 225.26
vegetation as support for overhead spans 225.26 230.10
vegetation can not support service conductors 230.10
vehicle door does not need lighting outlet 210.70A(2)b
vehicle-mounted generators 250.34B
vehicular traffic transformers 110.31D
vehicular traffic vertical clearance 225.19A ex.1
vented cells 480.10
ventilated bus 368.237
ventilation calculation method 625.28
vertical position enclosure 240.33
vertical risers 342.30B(3)
vertical rod antenna systems 810.1
vessel 427.2
voltage drop branch circuits 3% recommended but not required 210.19A1 FPN
4
voltage drop feeders 3% recommended not required 215.2A(3) FPN 2
voltage gradients 680.26A
voltage nominal 120/ 120/240 208Y/120 240
voltage nominal 347 480 408Y/277 600Y/347 600
volume allowance per conductor table 314.16B
"w" suffix flexible cord exposed to water 680.56B
w white grounded conductor 200.10B
walkway clearance table 225.60
wall mounted luminaire 314.27A ex.
wall-mounted oven calculation 210.19A(3)
wall mounted ovens existing grounded 250.142B ex.1
wallpaper 424.93A(5)
wall space two feet wide or wider need receptacle 210.52A(2)
warning signs 110.27C
waste disposers 422.16B(1)
waste disposer cord 18 inches to 3 feet 422.16B(1)2
waste kapok baled 500.5D(1)FPN2
water clearance table 225.60
water level 555.2 (2) 690.2
water level maximum 680.2
water pipe 250.52A(1)
water runoff 406.8A
wedge-type supports 300.19A ex.
welding raceways 300.18B
welding splices 110.14B
well 250.112M
wall casings 250.112M
well galvanized 314.40A
well-way 620.34
wet bar sink GFCI receptacle 6 feet 210.8A(7)
wet location conductors 310.8C
wet location 75 degree centigrade table 310.13
wet scrubbers 250.114(3)D
wheelchair lifts 620.5A
wheelchair lifts branch circuit 620.21
white 200.6 200.7 200.9 200.10 210.5A
white 250.58B 310.12 322.120 400.22A-C 402.8
520.53H
white continuous stripes three grounded 200.6B 200.6C
white or gray grounded conductor 200.7
white striped grounded conductor 200.6
width of working space 30 inches 110.26A(2)
winding with tape 400.10 FPN
wind loading 810.16B
window clearance overhead 3 feet 230.9A
window top clearance 3 feet 225.19D1
windshield washer fluid 511.3A(2)
wire bending offset definition 312.6B(2) FPN
wire bending space table 312.6A 312.6B
wire binding nuts #10 AWG or smaller 110.14A
wire main bonding jumper 250.28A
wires per terminal bending space table 312.6A B
wiring methods table 392.3A
wiring space 75% at cross section in enclosures w/taps 312.8
wiring space 40% at cross section in enclosures w/ no taps 312.8
wood 300.6C
wood braces 1X2 314.23B(2)
wooden plugs, not permitted 110.13A
wooden staves 680.42B
woodwork 382.30
woodworking 382.30 430.112 ex.a 500.5D1 FPN1 800.50B
work light 520.2
wrench-tight 250.92B(2) 314.23F
written record of test performance for GFCI 230.95C
wye connected 250.20B(2)
wye-delta starting 430.32A(1)
xenon 540.2 540.13
x ray apparatus 300.20B ex.
x ray equipment branch circuits 517.73 660.2
x ray installations 517.2
yards, covered 90.2A(2)
yellow 424.35 517.160A(5)
yellow 120 volts 424.35
yellow stripes 250.119 250.119c 400.23 517.61
520.53
yellow stripes 550.5B 551.55B 552.43B 552.56B 555.8B
yoke 250.146A 250.146B 404.10B
yoke of receptacle multiple branch circuit 210.7B
Z for aluminum wires Chapter 9 Table 9
Z for uncoated copper wire Chapter 9 Table 9
zig zag 450.5
zinc 552.10C(4) 668.1 725.41A(5)
zinc box 314.40B
zinc galvanized 250.52A(3)
zirconium dust 500.6B(1) FPN
zone equipment 505.9C(2)
zone equipment marking format FPN 505.9C(2)
zone for fire ladders 225.19E
zone O listing 505.9B 505.16A
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