Annealed Copper
| Size |
Diameter |
Cross Sectional Area
|
Resistance |
Indiv. Strands |
| AWG |
mm |
mil |
Square
mm
|
Square
In. |
Circular
Mils |
Ω /
km |
Ω /
1,000 ft |
No. |
Dia.
In. |
| 4/0 |
13.4112 |
528 |
107.219 |
0.1662 |
211,600 |
0.1996
|
0.0608 |
19 |
0.1055 |
| 3/0 |
11.9380 |
470 |
85.025 |
0.1318 |
167,800 |
0.2512
|
0.0766
|
19 |
0.0940 |
| 2/0 |
10.6426 |
419 |
67.443
|
0.1045 |
133,100 |
0.3170
|
0.0967
|
19 |
0.0837 |
| 1/0 |
9.4742 |
373 |
53.458
|
0.08286 |
105,500 |
0.399
|
0.122
|
19 |
0.0745 |
| 1 |
8.4328 |
332 |
42.406
|
0.06573 |
83,690 |
0.505
|
0.154
|
19 |
0.0664 |
| 2 |
7.4168 |
292 |
33.630
|
0.05213 |
66,370 |
0.634
|
0.194
|
7 |
0.0974 |
| 3 |
6.6040 |
260 |
26.673
|
0.04134 |
52,640 |
0.802
|
0.245
|
7 |
0.0867 |
| 4 |
5.8928 |
232 |
21.150
|
0.03278 |
41,740 |
1.010
|
0.308 |
7 |
0.0772 |
| 6 |
4.6736 |
184 |
13.301
|
0.02062 |
26,250 |
1.608
|
0.491 |
7 |
0.0612 |
| 8 |
3.7084 |
146 |
8.366
|
0.01297 |
16,510 |
2.551
|
0.778 |
7 |
0.0486 |
| 8 |
3.2636
|
128
|
8.366
|
0.01297
|
16,510
|
2.506
|
0.764
|
1
|
|
| 10 |
2.9464 |
116 |
5.260
|
0.008152 |
10,380 |
4.070
|
1.24 |
7 |
0.0385 |
| 10 |
2.588
|
102
|
5.260
|
0.008152
|
10,308
|
3.984
|
1.21 |
1
|
|
| 12 |
2.3241 |
91.5 |
3.309
|
0.005129 |
6,530 |
6.50
|
1.98 |
7 |
0.0305 |
| 12 |
2.05
|
81
|
3.309
|
0.005129
|
6,530
|
6.34
|
1.93
|
1
|
|
| 14 |
1.8440 |
72.6 |
2.081
|
0.003226 |
4,107 |
10.3
|
3.14
|
7 |
0.0242 |
| 14 |
1.63
|
640 |
2.081
|
0.003226
|
4,107
|
10.1
|
3.07
|
1
|
|
| 16 |
1.4630 |
57.6 |
1.309
|
0.002029 |
2,583 |
16.4
|
4.99 |
7 |
0.0192 |
16
|
1.29
|
510
|
1.309
|
0.002029
|
2,583
|
16.0
|
4.89
|
1
|
|
| 18 |
1.1582 |
45.598 |
0.823
|
0.001275 |
1,624 |
26.1
|
7.95
|
7 |
0.0152 |
18
|
1.02
|
40.157
|
0.823
|
0.001275
|
1,624
|
25.5
|
7.77
|
1
|
|
| 20 |
0.9220 |
36.299 |
0.518
|
0.0008027 |
1,022 |
34.58
|
10.54
|
7 |
0.0121 |
22
|
0.6438
|
25.347
|
0.326
|
0.00050458
|
642.328
|
52.99
|
16.15
|
1
|
|
23
|
0.573
|
22.559
|
0.258
|
0.0003999
|
509.034
|
66.79
|
20.36
|
1
|
|
24
|
0.5106
|
20.101
|
0.205
|
0.00031733
|
403.964
|
84.19
|
25.66
|
1
|
|
26
|
0.4049
|
15.941
|
0.129
|
0.00019957
|
254.056
|
133.99
|
40.84
|
1
|
|
Notes:
- Data from the National Electric Code (NFPA 70-2014), Chapter 9, Table 8; and other sources.
- AWG = American Wire Gage. See Wikipedia.
- 1 mil = 0.001 inches.
- A circular mil is the cross-sectional area of a wire one mil in diameter.
- Resistance is DC resistance at 75o C (167o F).
|
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