Allowable
Ampacities of Insulated |
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Not more than three current-carrying conductors in raceway or cable or earth (directly buried), based on Ambient Temperature of 30 degrees C (86° F) |
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Size | Temperature Rating of Conductor | Size | ||||||||
AWG 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 kcmil |
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Types TW 1) UF 1) |
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Copper | Aluminum or Copper-clad Aluminum | |||||||||
18 | -- | -- | 14 | -- | -- | -- | -- | |||
16 | -- | -- | 18 | -- | -- | -- | -- | |||
14 | 20 1) | 20 1) | 25 1) | -- | -- | -- | -- | |||
12 | 25 1) | 25 1) | 30 1) | 20 1) | 20 1) | 25 1) | 12 | |||
10 | 30 | 35 1) | 40 1) | 25 | 30 1) | 35 1) | 10 | |||
8 | 40 | 50 | 55 | 30 | 40 | 45 | 8 | |||
6 | 55 | 65 | 75 | 40 | 50 | 60 | 6 | |||
4 | 70 | 85 | 95 | 55 | 65 | 70 | 4 | |||
3 | 85 | 100 | 110 | 65 | 75 | 85 | 3 | |||
2 | 95 | 1115 | 130 | 75 | 90 | 100 | 2 | |||
1 | 110 | 130 | 150 | 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 | 190 | 230 | 255 | 300 | |||
350 | 260 | 310 | 350 | 210 | 250 | 280 | 350 | |||
400 | 280 | 385 | 380 | 225 | 270 | 305 | 400 | |||
500 | 320 | 380 | 430 | 260 | 310 | 350 | 500 | |||
600 | 355 | 420 | 475 | 285 | 340 | 385 | 600 | |||
700 | 385 | 460 | 520 | 310 | 375 | 420 | 700 | |||
750 | 400 | 475 | 535 | 320 | 385 | 435 | 750 | |||
800 | 410 | 490 | 555 | 330 | 395 | 450 | 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 | 520 | 625 | 705 | 435 | 520 | 585 | 1500 | |||
1750 | 545 | 650 | 735 | 455 | 545 | 615 | 1750 | |||
2000 | 560 | 665 | 750 | 470 | 560 | 630 | 2000 | |||
Correction Factor | ||||||||||
Ambient Temp ° C | For ambient temperatures other then 30° C (86° F), multiply the allowable ampacities shown above by the appropriate factor shown below. | Ambient Temp ° F | ||||||||
21 - 25 | 1.08 | 1.05 | 1.04 | 1.08 | 1.05 | 1.04 | 70 - 77 | |||
26 - 30 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 78 - 86 | |||
31 - 35 | .91 | .94 | .96 | .91 | .94 | .96 | 87 - 95 | |||
36 - 40 | .82 | .88 | .91 | .91 | .94 | .96 | 96 - 104 | |||
41 - 45 | .71 | .82 | .87 | .71 | .82 | .87 | 105 -113 | |||
46 - 50 | .58 | .75 | .82 | .58 | .75 | .82 | 114 - 122 | |||
51 - 55 | .41 | .67 | .76 | .41 | .67 | .76 | 123 - 131 | |||
56 - 60 | -- | .58 | .71 | -- | .58 | .71 | 132 - 140 | |||
61 - 70 | -- | .33 | .58 | -- | .33 | .58 | 141 - 158 | |||
71 - 80 | -- | -- | .41 | -- | -- | .41 | 159 - 176 | |||
1) Unless otherwise specifically permitted elsewhere in this code, the overcurrent protection for conductor types marked with 1) shall not exceed 15 amperes for No. 14, 20 amperes for No. 12 and 30 amperes for No. 10 copper or 15 amperes for No. 12 and 25 amperes for No. 10 aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied. |
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