ADOPTS WITH AMENDMENTS:

NFPA 70, 2017

Heads up: There are no amended sections in this chapter.

ARTICLE 400 — FLEXIBLE CORDS AND CABLES

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ARTICLE 402 — FIXTURE WIRES

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ARTICLE 404 — SWITCHES

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404 FPN X
404.4(C) X X X X

ARTICLE 406RECEPTACLES, CORD CONNECTORS, AND ATTACHMENT PLUGS (CAPS)

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ARTICLE 408SWITCHBOARDS, SWITCHGEAR, AND PANELBOARDS

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ARTICLE 409INDUSTRIAL CONTROL PANELS

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ARTICLE 410LUMINAIRES, LAMPHOLDERS, AND LAMPS

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ARTICLE 411 — LIGHTING SYSTEMS OPERATING AT 30 VOLTS OR LESS AND LIGHTING EQUIPMENT CONNECTED TO CLASS-2 POWER SOURCES

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ARTICLE 422APPLIANCES

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ARTICLE 424FIXED ELECTRIC SPACE-HEATING EQUIPMENT

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ARTICLE 425FIXED RESISTANCE AND ELECTRODE INDUSTRIAL PROCESS HEATING EQUIPMENT

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ARTICLE 426FIXED OUTDOOR ELECTRIC DEICING AND SNOW-MELTING EQUIPMENT

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ARTICLE 427FIXED ELECTRIC HEATING EQUIPMENT FOR PIPELINES AND VESSELS

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ARTICLE 430 — MOTORS, MOTOR CIRCUITS, AND CONTROLLERS

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ARTICLE 440 — AIR-CONDITIONING AND REFRIGERATING EQUIPMENT

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ARTICLE 445 — GENERATORS

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ARTICLE 450 — TRANSFORMERS AND TRANSFORMER VAULTS (INCLUDING SECONDARY TIES)

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ARTICLE 455PHASE CONVERTERS

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ARTICLE 460 — CAPACITORS

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ARTICLE 470 — RESISTORS AND REACTORS

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ARTICLE 480STORAGE BATTERIES

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ARTICLE 490EQUIPMENT OVER 1000 VOLTS, NOMINAL

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Part I General

This article covers general requirements, applications, and construction specifications for flexible cords and flexible cables.

Informational Note: UL 817, Cord Sets and Power-Supply Cords, allows the use of flexible cords manufactured in accordance with UL 62, Flexible Cords and Cables. See 400.10 and 400.12 for flexible cords that are part of a listed cord set or power-supply cord.

Flexible cords and flexible cables shall comply with this article and with the applicable provisions of other articles of this Code.
Flexible cords and flexible cables and their associated fittings shall be suitable for the conditions of use and location.
Flexible cords and flexible cables shall conform to the description in Table 400.4. The use of flexible cords and flexible cables other than those in Table 400.4 shall require permission by the authority having jurisdiction.

TABLE 400.4 Flexible Cords and Flexible Cables

Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG or kcmil Nominal Insulation Thickness Braid on Each Conductor Outer Covering Use
mm mils
Lamp cord C 300 18—16 2 or more Thermoset or thermoplastic 18—16 0.76 30 Cotton None Pendant or portable Dry locations Not hard usage
600 15—10 15—10 1.14 45
Elevator cable E1,2,3,4 300 or 600 20—2 2 or more Thermoset 20—16 0.51 20 Cotton Three cotton; outer one flame-retardant and moisture-resistant Elevator lighting and control Unclassified locations
15—12 0.76 30
12—10 1.14 45
8—2 1.52 60
20—16 0.51 20 Flexible nylon jacket
15—12 0.76 30
12—10 1.14 45
8—2 1.52 60
Elevator cable EO1,2,4 300 or 600 20—2 2 or more Thermoset 20—16 0.51 20 Cotton Three cotton; outer one flame-retardant and moisture-resistant Elevator lighting and control Unclassified locations
15—12 0.76 30
12—10 1.14 45
8—2 1.52 60
      One cotton and a neoprene jacket Hazardous (classified) locations
Elevator cable ETP2,4 300 or 600             Rayon Thermoplastic Hazardous (classified) locations
ETT2,4 300 or 600 None One cotton or equivalent and a thermoplastic jacket
Electric vehicle cable EV5,6 600 18—500 2 or more plus grounding conductor(s), plus optional hybrid data, signal communications, and optical fiber cables Thermoset with optional nylon 18—15 0.76
(0.51)
30
(20)
Optional Oil-resistant thermoset Electric vehicle charging Wet locations Extra-hard usage
14—10 1.14
(0.76)
45
(30)
8—2 1.52
(1.14)
60
(45)
1—4/0 2.03
(1.52)
80
(60)
250—500 2.41
(1.90)
95
(75)
EVJ5,6 300 18—12 18—12 0.76
(0.51)
30
(20)
Hard usage
EVE5,6 600 18—500 2 or more plus grounding conductor(s), plus optional hybrid data, signal communications, and optical fiber cables Thermoplastic with optional nylon 18—15 0.76
(0.51)
30
(20)
Oil-resistant thermoplastic elastomer Extra-hard usage
14—10 1.14
(0.76)
45
(30)
8—2 1.52
(1.14)
60
(45)
1—4/0 2.03
(1.52)
80
(60)
250—500 2.41
(1.90)
95
(75)
EVJE5,6 300 18—12 18—12 0.76
(0.51)
30
(20)
Hard usage
EVT5,6 600 18—500 2 or more plus grounding conductor(s), plus optional hybrid data, signal communications, and optical fiber cables Thermoplastic with optional nylon 18—15 0.76
(0.51)
30
(20)
Oil-resistant thermoplastic Extra-hard usage
14—10 1.14
(0.76)
45
(30)
8—2 1.52
(1.14)
60
(45)
1—4/0 2.03
(1.52)
80
(60)
250—500 2.41
(1.90)
95
(75)
EVJT5,6 300 18—12 18—12 0.76
(0.51)
30
(20)
Hard usage
Portable power cable G 2000 12—500 2—6 plus grounding conductor(s) Thermoset 12—2
1—4/0
250—500
1.52
2.03
2.41
60
80
95
  Oil-resistant thermoset Portable and extra-hard usage
G-GC7 2000 12—500 3—6 plus grounding conductors and 1 ground check conductor Thermoset 12—2
1—4/0
250—500
1.52
2.03
2.41
60
80
95
  Oil-resistant thermoset
Heater cord HPD 300 18—12 2, 3, or 4 Thermoset 18—16
15—12
0.38
0.76
15
30
None Cotton or rayon Portable heaters Dry locations Not hard usage
Parallel heater cord HPN8 300 18—12 2 or 3 Oil-resistant thermoset 18—16
15
14
12
1.14
1.52
2.41
45
60
95
None Oil-resistant thermoset Portable Damp locations Not hard usage
Thermoset jacketed heater cords HSJ 300 18—12 2, 3, or 4 Thermoset 18—16
15—12
0.76
0.14
30
45
None Cotton and thermoset Portable or portable heater Damp locations Hard usage
HSJO 300 18—12   Cotton and oil-resistant thermoset Damp and wet Locations
HSJOW9 300 18—12 Damp locations
HSJOO 300 18—12 Oil-resistant thermoset
HSJOOW9 300 18—12 Damp and wet Locations
Non-integral parallel cords NISP-1 300 20—18 2 or 3 Thermoset 20—18 0.38 15 None Thermoset Pendant or portable Damp locations Not hard usage
NISP-2 300 18—16 18—16 0.76 30
NISPE-18 300 20—18 Thermoplastic elastomer 20—18 0.38 15 Thermoplastic elastomer
NISPE-28 300 18—16 18—16 0.76 30
NISPT-18 300 20—18 Thermoplastic 20—18 0.38 15 Thermoplastic
NISPT-28 300 18—16 18—16 0.76 30
Twisted portable cord PD 300 18—16 2 or more Thermoset or thermoplastic 18—16 0.76 30 Cotton Cotton or rayon Pendant or portable Dry locations Not hard usage
600 14—10 15—10 1.14 45
Portable power cable PPE7 2000 12—500 1—6 plus optional grounding conductor(s) Thermoplastic elastomer 12—2 1.52 60   Oil-resistant thermoplastic elastomer Portable, extra-hard usage
1—4/0 2.03 80
250—500 2.41 95
Hard service cord S7 600 18—2 2 or more Thermoset 18—15 0.76 30 None Thermoset Pendant or portable Damp locations Extra-hard usage
14—10 1.14 45
8—2 1.52 60
Flexible stage and lighting power cable SC7,10 600 8—250 1 or more Thermoset 8—2
1—4/0
250
1.52
2.03
2.41
60
80
95
  Thermoset Portable, extra-hard usage
SCE7,10 600 Thermoplastic elastomer       Thermoplastic elastomer
SCT7,10 600 Thermoplastic       Thermoplastic
Hard service cord SE7 600 18—2 2 or more Thermoplastic elastomer 18—15
14—9
8—2
0.76
1.14
1.52
30
45
60
None Thermoplastic elastomer Pendant or portable Damp locations Extra-hard usage
SEW7,9 600 Damp and wet Locations
SEO7 600 Oil-resistant thermoplastic elastomer Damp locations
SEOW7,9 600 Damp and wet Locations
SEOO7 600 Oil-resistant thermoplastic elastomer Damp locations
SEOOW7,9 600 Damp and wet Locations
Junior hard service cord SJ 300 18—10 2—6 Thermoset 18—11
10
0.76
1.14
30
45
None Thermoset Pendant or portable Damp locations Hard usage
SJE 300 Thermoplastic elastomer Thermoplastic elastomer
SJEW9 300 Damp and wet Locations
SJEO 300 Oil-resistant thermoplastic elastomer Damp locations
SJEOW9 300 Damp and wet Locations
SJEOO 300 Oil-resistant thermoplastic elastomer Damp locations
SJEOOW9 300 Damp and wet Locations
SJO 300 Thermoset Oil-resistant thermoset Damp locations
SJOW9 300 Damp and wet Locations
SJOO 300 Oil-resistant thermoset Damp locations
SJOOW9 300 Damp and wet Locations
SJT 300 Thermoplastic       Thermoplastic Damp locations
SJTW9 300 Damp and wet locations
SJTO 300       Oil-resistant thermo-lastic Damp locations
SJTOW9 300 Damp and wet locations
SJTOO 300 Oil-resistant thermoplastic Damp locations
SJTOOW9 300 Damp and wet locations
Hard service cord SO7 600 18—2 2 or more Thermoset 18—15 0.76 30 None Oil-resistant thermoset Pendant or portable Damp locations Extra-hard usage
SOW7,9 600 Damp and wet locations
SOO7 600 Oil-resistant thermoset 14—9
8—2
1.14
1.52
45
60
Damp locations
SOOW7,9 600 Damp and wet locations
All thermoset parallel cord SP-1 300 20—18 2 or 3 Thermoset 20—18 0.76 30 None None Pendant or portable Damp locations Not hard usage
SP-2 300 18—16 18—16 1.14 45
SP-3 300 18—10 18—16
15
14
12
10
1.52
2.03
2.41
2.80
60
80
95
110
Refrigerators, room air conditioners, and as permitted in 422.16(B)
All elastomer (thermoplastic) parallel cord SPE-18 300 20—18 2 or 3 Thermoplastic elastomer 20—18 0.76 30 None None Pendant or portable Damp locations Not hard usage
SPE-28 300 18—16 18—16 1.14 45
SPE-38 300 18—10 18—16
15
14
12
10
1.52
2.03
2.41
2.80
60
80
95
110
Refrigerators, room air conditioners, and as permitted in 422.16(B)
All thermoplastic parallel cord SPT-1 300 20—18 2 or 3 Thermoplastic 20—18 0.76 30 None None Pendant or portable Damp locations Not hard usage
SPT-1W9 300 2 Damp and wet locations
SPT-2 300 18—16 2 or 3 18—16 1.14 45 Damp locations
SPT-2W9 300 2 Damp and wet locations
SPT-3 300 18—10 2 or 3 18—16
15
14
12
10
1.52
2.03
2.41
2.80
60
80
95
110
Refrigerators, room air conditioners, and as permitted in 422.16(B) Damp locations Not hard usage
Range, dryer cable SRD 300 10—4 3 or 4 Thermoset 10—4 1.14 45 None Thermoset Portable Damp locations Ranges, dryers
SRDE 300 10—4 3 or 4 Thermoplastic elastomer None Thermoplastic elastomer
SRDT 300 10—4 3 or 4 Thermoplastic None Thermoplastic
Hard service cord ST7 600 18—2 2 or more Thermoplastic 18—15
14—9
8—2
0.76
1.14
1.52
30
45
60
None Thermoplastic Pendant or portable Damp locations Extra-hard usage
STW7,9 600 Damp and wet locations
STO7 600 Oil-resistant thermo-lastic Damp locations
STOW7, 9 600 Damp and wet locations
STOO7 600 Oil-resistant thermoplastic Damp locations
STOOW7 600 Damp and wet locations
Vacuum cleaner cord SV 300 18—16 2 or 3 Thermoset 18—16 0.38 15 None Thermoset Pendant or portable Damp locations Not hard usage
SVE 300 Thermoplastic elastomer Thermoplastic elastomer
SVEO 300 Oil-resistant Thermoplastic elastomer
SVEOO 300 Oil-resistant thermoplastic elastomer
SVO 300 Thermoset Oil-resistant thermoset
SVOO 300 Oil-resistant thermoset Oil-resistant thermoset
SVT 300 Thermoplastic Thermoplastic
SVTO 300 Thermoplastic Oil-resistant Thermoplastic
SVTOO 300 Oil-resistant thermoplastic
Parallel tinsel cord TPT11 300 27 2 Thermoplastic 27 0.76 30 None Thermoplastic Attached to an appliance Damp locations Not hard usage
Jacketed tinsel cord TST11 300 27 2 Thermoplastic 27 0.38 15 None Thermoplastic Attached to an appliance Damp locations Not hard usage
Portable power cable W7 2000 12—500
501—1000
1—6
1
Thermoset 12—2
1—4/0
250—500
501—1000
1.52
2.03
2.41
2.80
60
80
95
110
  Oil-resistant thermoset Portable, extra-hard usage
Notes:
All types listed in Table 400.4 shall have individual conductors twisted together, except for Types HPN, SP-1, SP-2, SP-3, SPE-1, SPE-2, SPE-3, SPT-1, SPT-2, SPT-3, SPT-1W, SPT-2W, TPT, NISP-1, NISP-2, NISPT-1, NISPT-2, NISPE-1, NISPE-2, and three-conductor parallel versions of SRD, SRDE, and SRDT.
The individual conductors of all cords, except those of heat-resistant cords, shall have a thermoset or thermoplastic insulation, except that the equipment grounding conductor, where used, shall be in accordance with 400.23(B).
1Rubber-filled or varnished cambric tapes shall be permitted as a substitute for the inner braids.
2Elevator traveling cables for operating control and signal circuits shall contain nonmetallic fillers as necessary to maintain concentricity. Cables shall have steel supporting members as required for suspension by 620.41. In locations subject to excessive moisture or corrosive vapors or gases, supporting members of other materials shall be permitted. Where steel supporting members are used, they shall run straight through the center of the cable assembly and shall not be cabled with the copper strands of any conductor.
In addition to conductors used for control and signaling circuits, Types E, EO, ETP, and ETT elevator cables shall be permitted to incorporate in the construction one or more 20 AWG telephone conductor pairs, one or more coaxial cables, or one or more optical fibers. The 20 AWG conductor pairs shall be permitted to be covered with suitable shielding for telephone, audio, or higher frequency communications circuits; the coaxial cables shall consist of a center conductor, insulation, and a shield for use in video or other radio frequency communications circuits. The optical fiber shall be suitably covered with flame-retardant thermoplastic. The insulation of the conductors shall be rubber or thermoplastic of a thickness not less than specified for the other conductors of the particular type of cable. Metallic shields shall have their own protective covering. Where used, these components shall be permitted to be incorporated in any layer of the cable assembly but shall not run straight through the center.
3Insulations and outer coverings that meet the requirements as flame retardant, limited smoke, and are so listed, shall be permitted to be marked for limited smoke after the Code type designation.
4Elevator cables in sizes 20 AWG through 14 AWG are rated 300 volts, and sizes 10 AWG through 2 AWG are rated 600 volts. 12 AWG is rated 300 volts with a 0.76 mm (30 mil) insulation thickness and 600 volts with a 1.14 mm (45 mil) insulation thickness.
5Conductor size for Types EV, EVJ, EVE, EVJE, EVT, and EVJT cables apply to nonpower-limited circuits only. Conductors of power-limited (data, signal, or communications) circuits may extend beyond the stated AWG size range. All conductors shall be insulated for the same cable voltage rating. 6Insulation thickness for Types EV, EVJ, EVEJE, EVT, and EVJT cables of nylon construction is indicated in parentheses.
7Types G, G-GC, S, SC, SCE, SCT, SE, SEO, SEOO, SEW, SEOW, SEOOW, SO, SOO, SOW, SOOW, ST, STO, STOO, STW, STOW, STOOW, PPE, and W shall be permitted for use on theater stages, in garages, and elsewhere where flexible cords are permitted by this Code.
8The third conductor in Type HPN shall be used as an equipment grounding conductor only. The insulation of the equipment grounding conductor for Types SPE-1, SPE-2, SPE-3, SPT-1, SPT-2, SPT-3, NISPT-1, NISPT-2, NISPE-1, and NISPE-2 shall be permitted to be thermoset polymer.
9Cords that comply with the requirements for outdoor cords and are so listed shall be permitted to be designated as weather and water resistant with the suffix "W" after the Code type designation. Cords with the "W" suffix are suitable for use in wet locations and are sunlight resistant.
10The required outer covering on some single-conductor cables may be integral with the insulation.
11Types TPT and TST shall be permitted in lengths not exceeding 2.5 m (8 ft) where attached directly, or by means of a special type of plug, to a portable appliance rated at 50 watts or less and of such nature that extreme flexibility of the cord is essential.
Table 400.5(A)(1) provides the allowable ampacities, and Table 400.5(A)(2) provides the ampacities for flexible cords and flexible cables with not more than three current-carrying conductors. These tables shall be used in conjunction with applicable end-use product standards to ensure selection of the proper size and type. Where cords and cables are used in ambient temperatures other than 30°C (86°F), the temperature correction factors from Table 310.15(B)(2)(a) that correspond to the temperature rating of the cord or cable shall be applied to the ampacity in Table 400.5(A)(1) and Table 400.5(A)(2). Cords and cables rated 105°C shall use correction factors in the 90°C column of Table 310.15(B)(2)(a) for temperature correction. Where the number of current-carrying conductors exceeds three, the allowable ampacity or the ampacity of each conductor shall be reduced from the three-conductor rating as shown in Table 400.5(A)(3).

Informational Note: See Informative Annex B, Table B.310.15(B)(2)(11), for adjustment factors for more than three current-carrying conductors in a raceway or cable with load diversity.

A neutral conductor that carries only the unbalanced current from other conductors of the same circuit shall not be required to meet the requirements of a current-carrying conductor.

In a 3-wire circuit consisting of two phase conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system, a common conductor carries approximately the same current as the line-to-neutral currents of the other conductors and shall be considered to be a current-carrying conductor.

On a 4-wire, 3-phase, wye circuit where more than 50 percent of the load consists of nonlinear loads, there are harmonic currents present in the neutral conductor and the neutral conductor shall be considered to be a current-carrying conductor.

TABLE 400.5(A)(1) Allowable Ampacity for Flexible Cords and Flexible Cables [Based on Ambient Temperature of 30°C (86°F). See 400.13 and Table 400.4.]

Copper Conductor Size (AWG) Thermoplastic Types TPT, TST Thermoset Types C, E, EO, PD, S, SJ, SJO, SJOW, SJOO, SJOOW, SO, SOW, SOO, SOOW, SP-1, SP-2, SP-3, SRD, SV, SVO, SVOO, NISP-1, NISP-2 Types HPD, HPN, HSJ, hsJo, hsjow, hsjoo, HSJOOW
Thermoplastic Types ETP, ETT, NISPE-1, NISPE-2, NISPT-1, NISPT-2, SE, SEW, SEO, SEOO, SEOW, SEOOW, SJE, SJEW, SJEO, SJEOO, SJEOW, SJEOOW, SJT, SJTW, SJTO, SJTOW, SJTOO, SJTOOW, SPE-1, SPE-2, SPE-3, SPT-1, SPT-1W, SPT-2, SPT-2W, SPT-3, ST, STW, SRDE, SRDT, STO, STOW, STOO, STOOW, SVE, SVEO, SVEOO, SVT, SVTO, SVTOO
    Column Aa Column Bb  
27c 0.5
20 5d e
18 7 10 10
17 9 12 13
16 10 13 15
15 12 16 17
14 15 18 20
13 17 21
12 20 25 30
11 23 27
10 25 30 35
9 29 34
8 35 40
7 40 47
6 45 55
5 52 62
4 60 70
3 70 82
2 80 95
aThe allowable currents under Column A apply to three-conductor cords and other multiconductor cords connected to utilization equipment so that only three-conductors are current-carrying.
bThe allowable currents under Column B apply to two-conductor cords and other multiconductor cords connected to utilization equipment so that only two conductors are current-carrying.
cTinsel cord.
dElevator cables only.
e7 amperes for elevator cables only; 2 amperes for other types.

An equipment grounding conductor shall not be considered a current-carrying conductor.

Where a single conductor is used for both equipment grounding and to carry unbalanced current from other conductors, as provided for in 250.140 for electric ranges and electric clothes dryers, it shall not be considered as a current-carrying conductor.

TABLE 400.5(A)(2) Ampacity of Cable Types SC, SCE, SCT, PPE, G, G-GC, and W [Based on Ambient Temperature of 30°C (86°F). See Table 400.4.]

Copper Conductor Size (AWG or kcmil) Temperature Rating of Cable
60°C (140°F)   75°C (167°F)   90°C (194°F)
D1 E2 F3   D1 E2 F3   D1 E2 F3
12 31 26   37 31   42 35
10 44 37   52 43   59 49
8 60 55 48   70 65 57   80 74 65
6 80 72 63   95 88 77   105 99 87
4 105 96 84   125 115 101   140 130 114
3 120 113 99   145 135 118   165 152 133
2 140 128 112   170 152 133   190 174 152
1 165 150 131   195 178 156   220 202 177
1/0 195 173 151   230 207 181   260 234 205
2/0 225 199 174   265 238 208   300 271 237
3/0 260 230 201   310 275 241   350 313 274
4/0 300 265 232   360 317 277   405 361 316
250 340 296 259   405 354 310   455 402 352
300 375 330 289   445 395 346   505 449 393
350 420 363 318   505 435 381   570 495 433
400 455 392 343   545 469 410   615 535 468
500 515 448 392   620 537 470   700 613 536
600 575   690   780
700 630   755   855
750 655   785   885
800 680   815   920
900 730   870   985
1000 780   935   1055
1The ampacities under subheading D shall be permitted for single-conductor Types SC, SCE, SCT, PPE, and W cable only where the individual conductors are not installed in raceways and are not in physical contact with each other except in lengths not to exceed 600 mm (24 in.) where passing through the wall of an enclosure.
2The ampacities under subheading E apply to two-conductor cables and other multiconductor cables connected to utilization equipment so that only two conductors are current-carrying.
3The ampacities under subheading F apply to three-conductor cables and other multiconductor cables connected to utilization equipment so that only three conductors are current-carrying.

TABLE 400.5(A)(3) Adjustment Factors for More Than Three Current-Carrying Conductors in a Flexible Cord or Flexible Cable

Number of Conductors Percent of Value in Table 400.5(A)(1) and Table 400.5(A)(2)
4—6 80
7—9 70
10—20 50
21—30 45
31—40 40
41 and above 35
In no case shall conductors be associated together in such a way with respect to the kind of circuit, the wiring method used, or the number of conductors such that the limiting temperature of the conductors is exceeded.
Under engineering supervision, conductor ampacities shall be permitted to be calculated in accordance with 310.15(C).
Flexible cords and flexible cables shall be marked by means of a printed tag attached to the coil reel or carton. The tag shall contain the information required in 310.120(A). Types S, SC, SCE, SCT, SE, SEO, SEOO, SJ, SJE, SJEO, SJEOO, SJO, SJT, SJTO, SJTOO, SO, SOO, ST, STO, STOO, SEW, SEOW, SEOOW, SJEW, SJEOW, SJEOOW, SJOW, SJTW, SJTOW, SJTOOW, SOW, SOOW, STW, STOW, and STOOW flexible cords and G, G-GC, PPE, and W flexible cables shall be durably marked on the surface at intervals not exceeding 610 mm (24 in.) with the type designation, size, and number of conductors. Required markings on tags, cords, and cables shall also include the maximum operating temperature of the flexible cord or flexible cable.
Flexible cords and cable types listed in Table 400.4 shall be permitted to be surface marked to indicate special characteristics of the cable materials. These markings include, but are not limited to, markings for limited smoke, sunlight resistance, and so forth.
Flexible cords and flexible cables shall be used only for the following:
  1. Pendants.
  2. Wiring of luminaires.
  3. Connection of portable luminaires, portable and mobile signs, or appliances.
  4. Elevator cables.
  5. Wiring of cranes and hoists.
  6. Connection of utilization equipment to facilitate frequent interchange.
  7. Prevention of the transmission of noise or vibration.
  8. Appliances where the fastening means and mechanical connections are specifically designed to permit ready removal for maintenance and repair, and the appliance is intended or identified for flexible cord connection.
  9. Connection of moving parts.
  10. Where specifically permitted elsewhere in this Code.
  11. Between an existing receptacle outlet and an inlet, where the inlet provides power to an additional single receptacle outlet. The wiring interconnecting the inlet to the single receptacle outlet shall be a Chapter 3 wiring method. The inlet, receptacle outlet, and Chapter 3 wiring method, including the flexible cord and fittings, shall be a listed assembly specific for this application.
Where used as permitted in 400.10(A) (3), (A)(6), and (A)(8), each flexible cord shall be equipped with an attachment plug and shall be energized from a receptacle outlet or cord connector body.

Exception: As permitted in 368.56.

Unless specifically permitted in 400.10, flexible cables, flexible cord sets, and power supply cords shall not be used for the following:
  1. As a substitute for the fixed wiring of a structure
  2. Where run through holes in walls, structural ceilings, suspended ceilings, dropped ceilings, or floors
  3. Where run through doorways, windows, or similar openings
  4. Where attached to building surfaces

    Exception to (4): Flexible cord and flexible cable shall be permitted to be attached to building surfaces in accordance with 368.56(B).

  5. Where concealed by walls, floors, or ceilings or located above suspended or dropped ceilings

    Exception to (5): Flexible cord and flexible cable shall be permitted if contained within an enclosure for use in Other Spaces Used for Environmental Air as permitted by 300.22(C)(3).

  6. Where installed in raceways, except as otherwise permitted in this Code
  7. Where subject to physical damage
Flexible cord shall be used only in continuous lengths without splice or tap where initially installed in applications permitted by 400.10(A). The repair of hard-service cord and junior hard-service cord (see Trade Name column in Table 400.4) 14 AWG and larger shall be permitted if conductors are spliced in accordance with 110.14(B) and the completed splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced.
Flexible cords and flexible cables shall be connected to devices and to fittings so that tension is not transmitted to joints or terminals.

Exception: Listed portable single-pole devices that are intended to accommodate such tension at their terminals shall be permitted to be used with single-conductor flexible cable.

Informational Note: Some methods of preventing pull on a cord from being transmitted to joints or terminals include knotting the cord, winding with tape, and using support or strain-relief fittings.

Flexible cords used in show windows and showcases shall be Types S, SE, SEO, SEOO, SJ, SJE, SJEO, SJEOO, SJO, SJOO, SJT, SJTO, SJTOO, SO, SOO, ST, STO, STOO, SEW, SEOW, SEOOW, SJEW, SJEOW, SJEOOW, SJOW, SJOOW, SJTW, SJTOW, SJTOOW, SOW, SOOW, STW, STOW, or STOOW.

Exception No. 1: For the wiring of chain-supported luminaires.

Exception No. 2: As supply cords for portable luminaires and other merchandise being displayed or exhibited.

Flexible cords not smaller than 18 AWG, and tinsel cords or cords having equivalent characteristics of smaller size approved for use with specific appliances, shall be considered as protected against