Last modified on 9 February 2011, at 02:33

Engineering Tables/American Wire Gauge

The table below shows various data including both the resistance of the various wire gauges and the allowable current (ampacity) based on plastic insulation. The diameter information in the table applies to solid wires. Stranded wires are calculated by calculating the equivalent cross sectional copper area. Fusing Current (melting wire) is estimated based on 25°C. The table below assumes DC, or AC frequencies equal to or less than 60 Hz, and does not take skin effect into account. Turns of wire is on a best-case scenario when winding tightly packed coils with no insulation.

AWG Diameter Turns of wire Area Copper
resistance
NEC copper wire
ampacity with 60/75/
90°C insulation (A)
Approximate
stranded metric
equivalents
Fusing Current
(copper)
(inch) (mm) (per inch) (per cm) (kcmil) (mm2) (Ω/km) (Ω/kFT) Preese
(~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 31KA 173KA
000 (3/0) 0.4096 10.404 2.44 0.961 168 85.0 0.2028 0.06180 165 / 200 / 225 24.5KA 137KA
00 (2/0) 0.3648 9.266 2.74 1.08 133 67.4 0.2557 0.07793 145 / 175 / 195 19.5KA 109KA
0 (1/0) 0.3249 8.252 3.08 1.21 106 53.5 0.3224 0.09827 125 / 150 / 170 1.9KA 15.5KA 87KA
1 0.2893 7.348 3.46 1.36 83.7 42.4 0.4066 0.1239 110 / 130 / 150 1.6KA 12KA 68KA
2 0.2576 6.544 3.88 1.53 66.4 33.6 0.5127 0.1563 95 / 115 / 130 1.3KA 9.7KA 54KA
3 0.2294 5.827 4.36 1.72 52.6 26.7 0.6465 0.1970 85 / 100 / 110 196/0.4 1.1KA 7.7KA 43KA
4 0.2043 5.189 4.89 1.93 41.7 21.2 0.8152 0.2485 70 / 85 / 95 946A 6.1KA 34KA
5 0.1819 4.621 5.50 2.16 33.1 16.8 1.028 0.3133 126/0.4 795A 4.8KA 27KA
6 0.1620 4.115 6.17 2.43 26.3 13.3 1.296 0.3951 55 / 65 / 75 668A 3.8KA 21KA
7 0.1443 3.665 6.93 2.73 20.8 10.5 1.634 0.4982 80/0.4 561A 3KA 17KA
8 0.1285 3.264 7.78 3.06 16.5 8.37 2.061 0.6282 40 / 50 / 55 472A 2.4KA 13.5KA
9 0.1144 2.906 8.74 3.44 13.1 6.63 2.599 0.7921 84/0.3 396A 1.9KA 10.7KA
10 0.1019 2.588 9.81 3.86 10.4 5.26 3.277 0.9989 30 / 35 / 40 333A 1.5KA 8.5KA
11 0.0907 2.305 11.0 4.34 8.23 4.17 4.132 1.260 56/0.3 280A 1.2KA 6.7KA
12 0.0808 2.053 12.4 4.87 6.53 3.31 5.211 1.588 25 / 25 / 30 235A 955A 5.3KA
13 0.0720 1.828 13.9 5.47 5.18 2.62 6.571 2.003 50/0.25 198A 758A 4.2KA
14 0.0641 1.628 15.6 6.14 4.11 2.08 8.286 2.525 20 / 20 / 25 166A 601A 3.3KA
15 0.0571 1.450 17.5 6.90 3.26 1.65 10.45 3.184 30/0.25 140A 477A 2.7KA
16 0.0508 1.291 19.7 7.75 2.58 1.31 13.17 4.016 — / — / 18 117A 377A 2.1KA
17 0.0453 1.150 22.1 8.70 2.05 1.04 16.61 5.064 32/0.2 99A 300A 1.7KA
18 0.0403 1.024 24.8 9.77 1.62 0.823 20.95 6.385 — / — / 14 24/0.2 83A 237A 1.3KA
19 0.0359 0.912 27.9 11.0 1.29 0.653 26.42 8.051 70A 189A 1KA
20 0.0320 0.812 31.3 12.3 1.02 0.518 33.31 10.15 16/0.2 58.5A 149A 834A
21 0.0285 0.723 35.1 13.8 0.810 0.410 42.00 12.80 13/0.2 49A 119A 662A
22 0.0253 0.644 39.5 15.5 0.642 0.326 52.96 16.14 7/0.25 41A 94A 525A
23 0.0226 0.573 44.3 17.4 0.509 0.258 66.79 20.36 35A 74A 416A
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 29A 59A 330A
25 0.0179 0.455 55.9 22.0 0.320 0.162 106.2 32.37 24A 47A 262A
26 0.0159 0.405 62.7 24.7 0.254 0.129 133.9 40.81 7/0.15 20A 37A 208A
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
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