AWG | Diameter | Turns of wire | Area |
Copper resistance[6] |
NEC copper wire ampacity with 60/75/90 °C insulation (A)[7] |
Approximate standard metric equivalents |
Fusing Current (copper)[8][9] |
||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(inch) | (mm) | (per in) | (per cm) | (kcmil) | (mm2) |
(Ω/km) (mΩ/m) |
(Ω/kFT) (mΩ/ft) |
Preece (~10s) |
Onderdonk (1s) |
Onderdonk (32ms) |
|||
0000 (4/0) | 0.4600 | 11.684 | 2.17 | 0.856 | 212 | 107 | 0.1608 | 0.04901 | 195 / 230 / 260 | 31 kA | 173 kA | ||
000 (3/0) | 0.4096 | 10.404 | 2.44 | 0.961 | 168 | 85.0 | 0.2028 | 0.06180 | 165 / 200 / 225 | 24.5 kA | 137 kA | ||
00 (2/0) | 0.3648 | 9.266 | 2.74 | 1.08 | 133 | 67.4 | 0.2557 | 0.07793 | 145 / 175 / 195 | 19.5 kA | 109 kA | ||
0 (1/0) | 0.3249 | 8.252 | 3.08 | 1.21 | 106 | 53.5 | 0.3224 | 0.09827 | 125 / 150 / 170 | 1.9 kA | 15.5 kA | 87 kA | |
1 | 0.2893 | 7.348 | 3.46 | 1.36 | 83.7 | 42.4 | 0.4066 | 0.1239 | 110 / 130 / 150 | 1.6 kA | 12 kA | 68 kA | |
2 | 0.2576 | 6.544 | 3.88 | 1.53 | 66.4 | 33.6 | 0.5127 | 0.1563 | 95 / 115 / 130 | 1.3 kA | 9.7 kA | 54 kA | |
3 | 0.2294 | 5.827 | 4.36 | 1.72 | 52.6 | 26.7 | 0.6465 | 0.1970 | 85 / 100 / 110 | 196/0.4 | 1.1 kA | 7.7 kA | 43 kA |
4 | 0.2043 | 5.189 | 4.89 | 1.93 | 41.7 | 21.2 | 0.8152 | 0.2485 | 70 / 85 / 95 | 946 A | 6.1 kA | 34 kA | |
5 | 0.1819 | 4.621 | 5.50 | 2.16 | 33.1 | 16.8 | 1.028 | 0.3133 | 126/0.4 | 795 A | 4.8 kA | 27 kA | |
6 | 0.1620 | 4.115 | 6.17 | 2.43 | 26.3 | 13.3 | 1.296 | 0.3951 | 55 / 65 / 75 | 668 A | 3.8 kA | 21 kA | |
7 | 0.1443 | 3.665 | 6.93 | 2.73 | 20.8 | 10.5 | 1.634 | 0.4982 | 80/0.4 | 561 A | 3 kA | 17 kA | |
8 | 0.1285 | 3.264 | 7.78 | 3.06 | 16.5 | 8.37 | 2.061 | 0.6282 | 40 / 50 / 55 | 472 A | 2.4 kA | 13.5 kA | |
9 | 0.1144 | 2.906 | 8.74 | 3.44 | 13.1 | 6.63 | 2.599 | 0.7921 | 84/0.3 | 396 A | 1.9 kA | 10.7 kA | |
10 | 0.1019 | 2.588 | 9.81 | 3.86 | 10.4 | 5.26 | 3.277 | 0.9989 | 30 / 35 / 40 (but use a 30 A OCPD) | 333 A | 1.5 kA | 8.5 kA | |
11 | 0.0907 | 2.305 | 11.0 | 4.34 | 8.23 | 4.17 | 4.132 | 1.260 | 56/0.3 | 280 A | 1.2 kA | 6.7 kA | |
12 | 0.0808 | 2.053 | 12.4 | 4.87 | 6.53 | 3.31 | 5.211 | 1.588 | 25 / 25 / 30 (but use a 20 A OCPD) | 235A | 955 A | 5.3 kA | |
13 | 0.0720 | 1.828 | 13.9 | 5.47 | 5.18 | 2.62 | 6.571 | 2.003 | 50/0.25 | 198 A | 758 A | 4.2 kA | |
14 | 0.0641 | 1.628 | 15.6 | 6.14 | 4.11 | 2.08 | 8.286 | 2.525 | 20 / 20 / 25 (but use a 15 A OCPD) | 166 A | 601 A | 3.3 kA | |
15 | 0.0571 | 1.450 | 17.5 | 6.90 | 3.26 | 1.65 | 10.45 | 3.184 | 30/0.25 | 140 A | 477 A | 2.7 kA | |
16 | 0.0508 | 1.291 | 19.7 | 7.75 | 2.58 | 1.31 | 13.17 | 4.016 | — / — / 18 | 117 A | 377 A | 2.1 kA | |
17 | 0.0453 | 1.150 | 22.1 | 8.70 | 2.05 | 1.04 | 16.61 | 5.064 | 32/0.2 | 99 A | 300 A | 1.7 kA | |
18 | 0.0403 | 1.024 | 24.8 | 9.77 | 1.62 | 0.823 | 20.95 | 6.385 | — / — / 14 | 24/0.2 | 83 A | 237A | 1.3 kA |
19 | 0.0359 | 0.912 | 27.9 | 11.0 | 1.29 | 0.653 | 26.42 | 8.051 | 70 A | 189 A | 1 kA | ||
20 | 0.0320 | 0.812 | 31.3 | 12.3 | 1.02 | 0.518 | 33.31 | 10.15 | 16/0.2 | 58.5 A | 149 A | 834 A | |
21 | 0.0285 | 0.723 | 35.1 | 13.8 | 0.810 | 0.410 | 42.00 | 12.80 | 13/0.2 | 49 A | 119 A | 662 A | |
22 | 0.0253 | 0.644 | 39.5 | 15.5 | 0.642 | 0.326 | 52.96 | 16.14 | 7/0.25 | 41 A | 94 A | 525 A | |
23 | 0.0226 | 0.573 | 44.3 | 17.4 | 0.509 | 0.258 | 66.79 | 20.36 | 35 A | 74 A | 416 A | ||
24 | 0.0201 | 0.511 | 49.7 | 19.6 | 0.404 | 0.205 | 84.22 | 25.67 | 1/0.5, 7/0.2, 30/0.1 | 29 A | 59 A | 330 A | |
25 | 0.0179 | 0.455 | 55.9 | 22.0 | 0.320 | 0.162 | 106.2 | 32.37 | 24 A | 47 A | 262 A | ||
26 | 0.0159 | 0.405 | 62.7 | 24.7 | 0.254 | 0.129 | 133.9 | 40.81 | 1/0.4, 7/0.15 | 20 A | 37 A | 208 A | |
27 | 0.0142 | 0.361 | 70.4 | 27.7 | 0.202 | 0.102 | 168.9 | 51.47 | |||||
28 | 0.0126 | 0.321 | 79.1 | 31.1 | 0.160 | 0.0810 | 212.9 | 64.90 | 7/0.12 | ||||
29 | 0.0113 | 0.286 | 88.8 | 35.0 | 0.127 | 0.0642 | 268.5 | 81.84 | |||||
30 | 0.0100 | 0.255 | 99.7 | 39.3 | 0.101 | 0.0509 | 338.6 | 103.2 | 1/0.25, 7/0.1 | ||||
31 | 0.00893 | 0.227 | 112 | 44.1 | 0.0797 | 0.0404 | 426.9 | 130.1 | |||||
32 | 0.00795 | 0.202 | 126 | 49.5 | 0.0632 | 0.0320 | 538.3 | 164.1 | 1/0.2, 7/0.08 | ||||
33 | 0.00708 | 0.180 | 141 | 55.6 | 0.0501 | 0.0254 | 678.8 | 206.9 | |||||
34 | 0.00630 | 0.160 | 159 | 62.4 | 0.0398 | 0.0201 | 856.0 | 260.9 | |||||
35 | 0.00561 | 0.143 | 178 | 70.1 | 0.0315 | 0.0160 | 1079 | 329.0 | |||||
36 | 0.00500 | 0.127 | 200 | 78.7 | 0.0250 | 0.0127 | 1361 | 414.8 | |||||
37 | 0.00445 | 0.113 | 225 | 88.4 | 0.0198 | 0.0100 | 1716 | 523.1 | |||||
38 | 0.00397 | 0.101 | 252 | 99.3 | 0.0157 | 0.00797 | 2164 | 659.6 | |||||
39 | 0.00353 | 0.0897 | 283 | 111 | 0.0125 | 0.00632 | 2729 | 831.8 | |||||
40 | 0.00314 | 0.0799 | 318 | 125 | 0.00989 | 0.00501 | 3441 | 1049 |
Stranded wires are specified with three numbers, the overall AWG size, the number of strands, and the AWG size of a strand. The number of strands and the AWG of a strand are separated by a slash. For example, a 22 AWG 7/30 stranded wire is a 22 AWG wire made from seven strands of 30 AWG wire.
Alternate ways are commonly used in the electrical industry to specify wire sizes as AWG.
The industry also bundles common wire for use in electrical distribution in homes and businesses, identifying a bundle's wire size followed by the number of wires in the bundle. The most common type of distribution cable, NM-B, is generally implied: