NEC 2014: Table 310.15(B)(16)
Allowable Ampacities of Insulated Conductors (no more than 3 current carrying conductors in raceway, cable, or Earth) based on Ambient Temperature of 30C. | |||||||
Size | Temperature Rating of Conductor | Size | |||||
AWG or kcmil | 60ºC | 75ºC | 90ºC | 60ºC | 75ºC | 90ºC | AWG or kcmil |
(140ºF) | (167ºF) | (194ºF) | (140ºF) | (167ºF) | (194ºF) | ||
Types | Types | Types | Types | Types | Types | ||
TW UF |
RHW THHW THW XHHW |
RHH THHN XHH XHHW |
TW UF |
RHW THHW THW XHHW |
RHH THHN XHH XHHW |
||
Copper | Aluminum | ||||||
18 | ---- | ---- | 14 | ---- | ---- | ---- | ---- |
16 | ---- | ---- | 18 | ---- | ---- | ---- | ---- |
14 | 15 | 20 | 25 | ---- | ---- | ---- | ---- |
12 | 20 | 25 | 30 | 15 | 20 | 25 | 12 |
10 | 30 | 35 | 40 | 25 | 30 | 35 | 10 |
8 | 40 | 50 | 55 | 35 | 40 | 45 | 8 |
6 | 55 | 65 | 75 | 40 | 50 | 55 | 6 |
4 | 70 | 85 | 95 | 55 | 65 | 75 | 4 |
3 | 85 | 100 | 115 | 65 | 75 | 85 | 3 |
2 | 95 | 115 | 130 | 75 | 90 | 100 | 2 |
1 | 110 | 130 | 145 | 85 | 100 | 115 | 1 |
1/0 | 125 | 150 | 170 | 100 | 120 | 135 | 1/0 |
2/0 | 145 | 175 | 195 | 115 | 135 | 150 | 2/0 |
3/0 | 165 | 200 | 225 | 130 | 155 | 175 | 3/0 |
4/0 | 195 | 230 | 260 | 150 | 180 | 205 | 4/0 |
250 | 215 | 255 | 290 | 170 | 205 | 230 | 250 |
300 | 240 | 285 | 320 | 195 | 230 | 260 | 300 |
350 | 260 | 310 | 350 | 210 | 250 | 280 | 350 |
400 | 280 | 335 | 380 | 225 | 270 | 305 | 400 |
500 | 320 | 380 | 430 | 260 | 310 | 350 | 500 |
600 | 350 | 420 | 475 | 285 | 340 | 385 | 600 |
700 | 385 | 460 | 520 | 315 | 375 | 425 | 700 |
750 | 400 | 475 | 535 | 320 | 385 | 435 | 750 |
800 | 410 | 490 | 555 | 330 | 395 | 445 | 800 |
900 | 435 | 520 | 585 | 355 | 425 | 480 | 900 |
1000 | 455 | 545 | 615 | 375 | 445 | 500 | 1000 |
1250 | 495 | 590 | 665 | 405 | 485 | 545 | 1250 |
1500 | 525 | 625 | 705 | 435 | 520 | 585 | 1500 |
1750 | 545 | 650 | 735 | 455 | 545 | 615 | 1750 |
2000 | 555 | 665 | 750 | 470 | 560 | 630 | 2000 |
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