NEC Chapter 9 Table 5
| Size | Insulation Type | |||||
|---|---|---|---|---|---|---|
| AWG / KCMIL | THW / THHW | XHH / XHHW | THHN / THWN | |||
| Diam (in) | Area (in²) | Diam (in) | Area (in²) | Diam (in) | Area (in²) | |
| 18 | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — |
| 14 | 0.133 | 0.0139 | 0.133 | 0.0139 | 0.111 | 0.0097 |
| 12 | 0.152 | 0.0181 | 0.152 | 0.0181 | 0.13 | 0.0133 |
| 10 | 0.176 | 0.0243 | 0.176 | 0.0243 | 0.164 | 0.0211 |
| 8 | 0.236 | 0.0437 | 0.236 | 0.0437 | 0.216 | 0.0366 |
| 6 | 0.304 | 0.0726 | 0.274 | 0.059 | 0.254 | 0.0507 |
| 4 | 0.352 | 0.0973 | 0.322 | 0.0814 | 0.324 | 0.0824 |
| 3 | 0.38 | 0.1134 | 0.35 | 0.0962 | 0.352 | 0.0973 |
| 2 | 0.412 | 0.1333 | 0.382 | 0.1146 | 0.384 | 0.1158 |
| 1 | 0.492 | 0.1901 | 0.442 | 0.1534 | 0.446 | 0.1562 |
| 1/0 | 0.532 | 0.2223 | 0.482 | 0.1825 | 0.486 | 0.1855 |
| 2/0 | 0.578 | 0.2624 | 0.528 | 0.219 | 0.532 | 0.2223 |
| 3/0 | 0.63 | 0.3117 | 0.58 | 0.2642 | 0.584 | 0.2679 |
| 4/0 | 0.688 | 0.3718 | 0.638 | 0.3197 | 0.642 | 0.3237 |
| 250 | 0.765 | 0.4596 | 0.705 | 0.3904 | 0.711 | 0.397 |
| 300 | 0.82 | 0.5281 | 0.76 | 0.4536 | 0.766 | 0.4608 |
| 350 | 0.871 | 0.5958 | 0.811 | 0.5166 | 0.817 | 0.5242 |
| 400 | 0.918 | 0.6619 | 0.858 | 0.5782 | 0.864 | 0.5863 |
| 500 | 1.003 | 0.7901 | 0.943 | 0.6984 | 0.949 | 0.7073 |
| 600 | 1.113 | 0.9729 | 1.053 | 0.8709 | 1.051 | 0.8676 |
| 700 | 1.184 | 1.101 | 1.124 | 0.9923 | 1.122 | 0.9887 |
| 750 | 1.218 | 1.1652 | 1.158 | 1.0532 | 1.156 | 1.0496 |
| 800 | 1.25 | 1.2272 | 1.19 | 1.1122 | 1.188 | 1.1085 |
| 900 | 1.314 | 1.3561 | 1.254 | 1.2351 | 1.252 | 1.2311 |
| 1000 | 1.372 | 1.4784 | 1.312 | 1.3519 | 1.31 | 1.3478 |
| 1250 | 1.539 | 1.8602 | 1.479 | 1.718 | — | — |
| 1500 | 1.662 | 2.1695 | 1.602 | 2.0157 | — | — |
| 1750 | 1.776 | 2.4773 | 1.716 | 2.3127 | — | — |
| 2000 | 1.882 | 2.7818 | 1.822 | 2.6073 | — | — |