AWG size chart for choose the right grounding wire

Copper wire/grounding cable cross reference table

Grounding copper wire cable cross reference chart, 0000(4/0)~40, include AWG – diameter ( mm, inch ) – section ( mm2,kcmil ) – resistance ( Ω/km,Ω/kFT )

AWG Diameter section Resistance
(mm) (inch) (mm2) (kcmil) (Ω/km) (Ω/kFT)
4/0 11.68 0.46 107.22 212 0.17 0.04901
3/0 10.4 0.4096 85.01 168 0.21 0.0618
2/0 9.27 0.3648 67.43 133 0.26 0.07793
1/0 8.25 0.3249 53.49 106 0.33 0.09827
1 7.35 0.2893 42.41 83.7 0.42 0.1239
2 6.54 0.2576 33.62 66.4 0.53 0.1563
3 5.83 0.2294 26.67 52.6 0.66 0.197
4 5.19 0.2043 21.15 41.7 0.84 0.2485
5 4.62 0.1819 16.77 33.1 1.06 0.3133
6 4.11 0.162 13.3 26.3 1.33 0.3951
7 3.67 0.1443 10.55 20.8 1.68 0.4982
8 3.26 0.1285 8.37 16.5 2.11 0.6282
9 2.91 0.1144 6.63 13.1 2.67 0.7921
10 2.59 0.1019 5.26 10.4 3.36 0.9989
11 2.3 0.0907 4.17 8.23 4.24 1.26
12 2.05 0.0808 3.332 6.53 5.31 1.588
13 1.82 0.072 2.627 5.18 6.69 2.003
14 1.63 0.0641 2.075 4.11 8.45 2.525
15 1.45 0.0571 1.646 3.26 10.6 3.184
16 1.29 0.0508 1.318 2.58 13.5 4.016
17 1.15 0.0453 1.026 2.05 16.3 5.064
18 1.02 0.0403 0.8107 1.62 21.4 6.385
19 0.912 0.0359 0.5667 1.29 26.9 8.051
20 0.813 0.032 0.5189 1.02 33.9 10.15
21 0.724 0.0285 0.4116 0.81 42.7 12.8
22 0.643 0.0253 0.3247 0.642 54.3 16.14
23 0.574 0.0226 0.2588 0.509 48.5 20.36
24 0.511 0.0201 0.2047 0.404 89.4 15.67
25 0.44 0.0179 0.1624 0.32 79.6 32.37
26 0.404 0.0159 0.1281 0.254 143 40.81
27 0.361 0.0142 0.1021 0.202 128 51.47
28 0.32 0.0126 0.0804 0.16 227 64.9
29 0.287 0.0113 0.0647 0.127 289 81.84
30 0.254 0.01 0.0507 0.101 361 103.2
31 0.226 0.0089 0.0401 0.0797 321 130.1
32 0.203 0.008 0.0316 0.0632 583 164.1
33 0.18 0.0071 0.0255 0.0501 944 206.9
34 0.16 0.0063 0.0201 0.0398 956 260.9
35 0.142 0.0056 0.0169 0.0315 1200 329
36 0.127 0.005 0.0127 0.025 1530 414.8
37 0.114 0.0045 0.0098 0.0198 1377 523.1
38 0.102 0.004 0.0081 0.0157 2400 659.6
39 0.089 0.0035 0.0062 0.0125 2100 831.8
40 0.079 0.0031 0.0049 0.00989 4080 1049
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