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Appendix Technical data

Regulatory codes

Allowable Conductor Ampacity National Electrical Code

Table 310.15(B)(16) Allowable Ampacities of Insulated Conductors Rated 0 - 2000 V, 60° - 90°C (140° - 194°F) Not More Than Three Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)

Table 310.15(B)(17) Allowable Ampacities of Single Insulated Conductors Rated 0 - 2000V, In Free Air, Based on Ambient Air Temperature of 30°C (86°F)

Temperature rating

Temperature rating

60°C (140°F) types

75°C (167°F) types

90°C (194°F) types

60°C (140°F) types

75°C (167°F) types

90°C (194°F) types

TW*

UF* FEPW* RHW* THW* XHHW* ZW*

RH* THHW* THWN* USE*

TA SIS MI THHN* THWN-2 XHHW*

TBS FEP* RHH* THHW* USE-2 XHHW-2

SA FEPB* RHW-2 THW-2 XHH ZW-2

TW*

UF* FEPW* RHW* THW* XHHW*

RH* THHW* THWN* ZW*

TA SIS MI THHN* THWN-2 XHHWT

TBS FEP* RHH* THHW* USE-2 XHHW-2

SA FEPB* RHW-2 THW-2 XHH ZW-2

Size

Size

18 AWG 16 AWG 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 KCMIL 300 KCMIL 350 KCMIL 400 KCMIL 500 KCMIL 600 KCMIL 700 KCMIL 750 KCMIL 800 KCMIL 900 KCMIL 1000 KCMIL 1250 KCMIL 1500 KCMIL 1750 KCMIL 2000 KCMIL

— —

— —

14 18

18 AWG 16 AWG 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 KCMIL 300 KCMIL 350 KCMIL 400 KCMIL 500 KCMIL 600 KCMIL 700 KCMIL 750 KCMIL 800 KCMIL 900 KCMIL 1000 KCMIL 1250 KCMIL 1500 KCMIL 1750 KCMIL 2000 KCMIL

— —

— —

18 24

20* 25*

20* 25* 35*

25* 30* 40*

25* 30* 40*

30* 35* 50*

35* 40* 55* 105 140 165 190 220 260 300 350 405 455 505 570 615 700 780 855 885 920 985 80

30 40 55 70 85 95

50 65 85

55 75 95

60 80

70 95

105 120 140 165 195 225 260 300 340 375 420 455 515 575 630 655 680 730 780 890 980

125 145 170 195 230 265 310 360 405 445 505 545 620 690 755 785 815 870 935

100 115 130 150 175 200 230 255 285 310 335 380 420 460 475 490 520 545 590 625 650 665

110 130 150 170 195 225 260 290 320 350 380 430 475 520 535 555 585 615 665 705 735 750

110 125 145 165 195 215 240 260 280 320 355 385 400 410 435 455 495 520 545 560

1055 1200 1325 1445

1065 1175 1280 1385

1070 1155

1560 * Unless otherwise specifically permitted elsewhere in this Code, the overcurrent protection for conductor types marked with an asterisk shall not exceed 15A for No. 14 copper, 20A for No. 12 copper, and 30A for No. 10 copper, after any correction factors for ambient temperature and number of conductors have been applied.

Table 310.15(B)(3)(a) Adjustment Factors for More than Three Current-Carrying Conductors in a Raceway or Cable. Where the number of current-carrying conductors in a raceway or cable exceeds three, the allowable ampacities shall be reduced as shown:

Table 310.15(B)(2)(a) Temperature Correction Factors

For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities shown above by the appropriate factor shown below.

Number of current-carrying conductors*

Percent of values in tables as adjusted for ambient temperature (if necessary)

Ambient temperature

60°C 1.00 0.82 0.58

75°C 1.00 0.88 0.75 0.58 0.33

90°C 1.00 0.91 0.82 0.71 0.58

30°C 40°C 50°C 60°C 70°C 80°C

4 - 6 7 - 9

80 70 50 45 40 35

10 - 20 21 - 30 31 - 40

— — —

—

—

more than 40

* Does not include ground

example: • Using LAPP part number 221007 (10 AWG, 6c + ground, 90°C THHN): 30 Amps ampacity @ 30°C × 0.80 Table 310.15(B)(3)(a)

24 Amps

=

• Using the same P/N at 40°C: 30 Amps ampacity @ 30°C

0.80 Table 310.15(B)(3)(a)

0.91 Table 310.15(B)(2)(a)

22 Amps

×

×

=

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