NEC 2011: 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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