Conductor Ampacity Based on the 2017 National Electrical Code®
Ampacity based on NEC® Table 310.15(B)(16) (formerly Table 310.16) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60° through 90°C (140° through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F).*
| Size | Temperature Rating of Conductor. (See Table 310.104(A).) | Size | |||||
|---|---|---|---|---|---|---|---|
| AWG or kcmil | 60°C (140°F) | 75°C (167°F) |
90°C (194°F) |
60°C (140°F) |
75°C (167°F) |
90°C (194°F) |
AWG or kcmil |
| Types TW, UF | Types RHW, THHW, THW, THWN, XHHW, USE, ZW | Types TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 | Types TW, UF | Types RHW, THHW, THW, THWN, XHHW, USE | Types TBS, SA, SIS, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 | ||
| Copper | Aluminum or Copper-Clad Aluminum | ||||||
|
18* 16* 14 * 12 * 10 * 8 |
— — 15 20 30 40 |
— — 20 25 35 50 |
14 18 25 30 40 55 |
— — — 15 25 35 |
— — — 20 30 40 |
— — — 25 35 45 |
— — — 12 * 10 * 8 |
|
6 4 3 2 1 |
55 70 85 95 110 |
65 85 100 115 130 |
75 95 115 130 145 |
40 55 65 75 85 |
50 65 75 90 100 |
55 75 85 100 115 |
6 4 3 2 1 |
|
1/0 2/0 3/0 4/0 |
125 145 165 195 |
150 175 200 230 |
170 145 165 195 |
100 115 130 150 |
120 135 155 180 |
135 150 175 205 |
1/0 2/0 3/0 4/0 |
|
250 300 350 400 500 |
215 240 260 280 320 |
255 285 310 335 380 |
290 320 350 380 430 |
170 195 210 225 260 |
205 230 250 270 310 |
230 260 280 305 350 |
250 300 350 400 500 |
|
600 700 750 800 900 |
350 385 400 410 435 |
420 460 475 490 520 |
475 520 535 555 585 |
285 315 320 330 355 |
340 375 385 395 425 |
385 425 435 445 480 |
600 700 750 800 900 |
|
1000 1250 1500 1750 2000 |
455 495 525 545 555 |
545 590 625 650 655 |
615 665 705 735 750 |
375 405 435 455 470 |
445 485 520 545 560 |
500 545 585 615 630 |
1000 1250 1500 1750 2000 |