NEC 2002: Chapter 9 Table 8
Conductor Properties | |||||||||||||||
Size | Conductors | DC Resistance at 75C (167F) | |||||||||||||
(AWG or kcmil) | Area | Stranding | Overall | Copper | Aluminum | ||||||||||
Qty | Diameter | Diameter | Area | Uncoated | Coated | ||||||||||
mm² | Cir. mils | mm | in. | mm | in. | mm² | in.² | ohm/km | ohm/kFT | ohm/km | ohm/kFT | ohm/km | ohm/kFT | ||
18 | 0.823 | 1620 | 1 | — | — | 1.02 | 0.04 | 0.823 | 0.001 | 25.5 | 7.77 | 26.5 | 8.08 | 42 | 12.8 |
18 | 0.823 | 1620 | 7 | 0.39 | 0.015 | 1.16 | 0.046 | 1.06 | 0.002 | 26.1 | 7.95 | 27.7 | 8.45 | 42.8 | 13.1 |
16 | 1.31 | 2580 | 1 | — | — | 1.29 | 0.051 | 1.31 | 0.002 | 16 | 4.89 | 16.7 | 5.08 | 26.4 | 8.05 |
16 | 1.31 | 2580 | 7 | 0.49 | 0.019 | 1.46 | 0.058 | 1.68 | 0.003 | 16.4 | 4.99 | 17.3 | 5.29 | 26.9 | 8.21 |
14 | 2.08 | 4110 | 1 | — | — | 1.63 | 0.064 | 2.08 | 0.003 | 10.1 | 3.07 | 10.4 | 3.19 | 16.6 | 5.06 |
14 | 2.08 | 4110 | 7 | 0.62 | 0.024 | 1.85 | 0.073 | 2.68 | 0.004 | 10.3 | 3.14 | 10.7 | 3.26 | 16.9 | 5.17 |
12 | 3.31 | 6530 | 1 | — | — | 2.05 | 0.081 | 3.31 | 0.005 | 6.34 | 1.93 | 6.57 | 2.01 | 10.45 | 3.18 |
12 | 3.31 | 6530 | 7 | 0.78 | 0.03 | 2.32 | 0.092 | 4.25 | 0.006 | 6.5 | 1.98 | 6.73 | 2.05 | 10.69 | 3.25 |
10 | 5.261 | 10380 | 1 | — | — | 2.588 | 0.102 | 5.26 | 0.008 | 3.984 | 1.21 | 4.148 | 1.26 | 6.561 | 2 |
10 | 5.261 | 10380 | 7 | 0.98 | 0.038 | 2.95 | 0.116 | 6.76 | 0.011 | 4.07 | 1.24 | 4.226 | 1.29 | 6.679 | 2.04 |
8 | 8.367 | 16510 | 1 | — | — | 3.264 | 0.128 | 8.37 | 0.013 | 2.506 | 0.764 | 2.579 | 0.786 | 4.125 | 1.26 |
8 | 8.367 | 16510 | 7 | 1.23 | 0.049 | 3.71 | 0.146 | 10.76 | 0.017 | 2.551 | 0.778 | 2.653 | 0.809 | 4.204 | 1.28 |
6 | 13.3 | 26240 | 7 | 1.56 | 0.061 | 4.67 | 0.184 | 17.09 | 0.027 | 1.608 | 0.491 | 1.671 | 0.51 | 2.652 | 0.808 |
4 | 21.15 | 41740 | 7 | 1.96 | 0.077 | 5.89 | 0.232 | 27.19 | 0.042 | 1.01 | 0.308 | 1.053 | 0.321 | 1.666 | 0.508 |
3 | 26.67 | 52620 | 7 | 2.2 | 0.087 | 6.6 | 0.26 | 34.28 | 0.053 | 0.802 | 0.245 | 0.833 | 0.254 | 1.32 | 0.403 |
2 | 33.62 | 66360 | 7 | 2.47 | 0.097 | 7.42 | 0.292 | 43.23 | 0.067 | 0.634 | 0.194 | 0.661 | 0.201 | 1.045 | 0.319 |
1 | 42.41 | 83690 | 19 | 1.69 | 0.066 | 8.43 | 0.332 | 55.8 | 0.087 | 0.505 | 0.154 | 0.524 | 0.16 | 0.829 | 0.253 |
1/0 | 53.49 | 105600 | 19 | 1.89 | 0.074 | 9.45 | 0.372 | 70.41 | 0.109 | 0.399 | 0.122 | 0.415 | 0.127 | 0.66 | 0.201 |
2/0 | 67.43 | 133100 | 19 | 2.13 | 0.084 | 10.62 | 0.418 | 88.74 | 0.137 | 0.317 | 0.0967 | 0.329 | 0.101 | 0.523 | 0.159 |
3/0 | 85.01 | 167800 | 19 | 2.39 | 0.094 | 11.94 | 0.47 | 111.9 | 0.173 | 0.2512 | 0.0766 | 0.261 | 0.0797 | 0.413 | 0.126 |
4/0 | 107.2 | 211600 | 19 | 2.68 | 0.106 | 13.41 | 0.528 | 141.1 | 0.219 | 0.1996 | 0.0608 | 0.205 | 0.0626 | 0.328 | 0.1 |
250 | 127 | — | 37 | 2.09 | 0.082 | 14.61 | 0.575 | 168 | 0.26 | 0.1687 | 0.0515 | 0.1753 | 0.0535 | 0.2778 | 0.0847 |
300 | 152 | — | 37 | 2.29 | 0.09 | 16 | 0.63 | 201 | 0.312 | 0.1409 | 0.0429 | 0.1463 | 0.0446 | 0.2318 | 0.0707 |
350 | 177 | — | 37 | 2.47 | 0.097 | 17.3 | 0.681 | 235 | 0.364 | 0.1205 | 0.0367 | 0.1252 | 0.0382 | 0.1984 | 0.0605 |
400 | 203 | — | 37 | 2.64 | 0.104 | 18.49 | 0.728 | 268 | 0.416 | 0.1053 | 0.0321 | 0.1084 | 0.0331 | 0.1737 | 0.0529 |
500 | 253 | — | 37 | 2.95 | 0.116 | 20.65 | 0.813 | 336 | 0.519 | 0.0845 | 0.0258 | 0.0869 | 0.0265 | 0.1391 | 0.0424 |
600 | 304 | — | 61 | 2.52 | 0.099 | 22.68 | 0.893 | 404 | 0.626 | 0.0704 | 0.0214 | 0.0732 | 0.0223 | 0.1159 | 0.0353 |
700 | 355 | — | 61 | 2.72 | 0.107 | 24.49 | 0.964 | 471 | 0.73 | 0.0603 | 0.0184 | 0.0622 | 0.0189 | 0.0994 | 0.0303 |
750 | 380 | — | 61 | 2.82 | 0.111 | 25.35 | 0.998 | 505 | 0.782 | 0.0563 | 0.0171 | 0.0579 | 0.0176 | 0.0927 | 0.0282 |
800 | 405 | — | 61 | 2.91 | 0.114 | 26.16 | 1.03 | 538 | 0.834 | 0.0528 | 0.0161 | 0.0544 | 0.0166 | 0.0868 | 0.0265 |
900 | 456 | — | 61 | 3.09 | 0.122 | 27.79 | 1.094 | 606 | 0.94 | 0.047 | 0.0143 | 0.0481 | 0.0147 | 0.077 | 0.0235 |
1000 | 507 | — | 61 | 3.25 | 0.128 | 29.26 | 1.152 | 673 | 1.042 | 0.0423 | 0.0129 | 0.0434 | 0.0132 | 0.0695 | 0.0212 |
1250 | 633 | — | 91 | 2.98 | 0.117 | 32.74 | 1.289 | 842 | 1.305 | 0.0338 | 0.0103 | 0.0347 | 0.0106 | 0.0554 | 0.0169 |
1500 | 760 | — | 91 | 3.26 | 0.128 | 35.86 | 1.412 | 1011 | 1.566 | 0.02814 | 0.00858 | 0.02814 | 0.00883 | 0.0464 | 0.0141 |
1750 | 887 | — | 127 | 2.98 | 0.117 | 38.76 | 1.526 | 1180 | 1.829 | 0.0241 | 0.00735 | 0.0241 | 0.00756 | 0.0397 | 0.0121 |
2000 | 1013 | — | 127 | 3.19 | 0.126 | 41.45 | 1.632 | 1349 | 2.092 | 0.02109 | 0.00643 | 0.02109 | 0.00662 | 0.0348 | 0.0106 |
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