1-8
Table 1-2.—Standard Solid Copper (American Wire Gauge)
Cross Section
Ohms per 1,000 ft
Gage
number
Diameter
(mils)
Circular mils
Square inches
25ºC. =
77ºF.
65ºC. =
149ºF.
Ohms per
mile 25ºC. =
77ºF.
Pounds per
1,000 ft.
0000
460.0
212,000.0
0.166
0.0500
0.0577
0.264
641.0
000
410.0
168,000.0
.132
.0630
.0727
.333
508.0
00
365.0
133,000.0
.105
.0795
.0917
.420
403.0
0
325.0
106,000.0
.0829
.100
.116
.528
319.0
1
289.0
83,700.0
.0657
.126
.146
.665
253.0
2
258.0
66,400.0
.0521
.159
.184
.839
201.0
3
229.0
52,600.0
.0413
.201
.232
1.061
159.0
4
204.0
41,700.0
.0328
.253
.292
1.335
126.0
5
182.0
33,100.0
.0260
.319
.369
1.685
100.0
6
162.0
26,300.0
.0206
.403
.465
2.13
79.5
7
144.0
20,800.0
.0164
.508
.586
2.68
63.0
8
128.0
16,500.0
.0130
.641
.739
3.38
50.0
9
114.0
13,100.0
.0103
.808
.932
4.27
39.6
10
102.0
10,400.0
.00815
1.02
1.18
5.38
31.4
11
91.0
8,230.0
.00647
1.28
1.48
6.75
24.9
12
81.0
6,530.0
.00513
1.62
1.87
8.55
19.8
13
72.0
5,180.0
.00407
2.04
2.36
10.77
15.7
14
64.0
4,110.0
.00323
2.58
2.97
13.62
12.4
15
57.0
3,260.0
.00256
3.25
3.75
17.16
9.86
16
51.0
2,580.0
.00203
4.09
4.73
21.6
7.82
17
45.0
2,050.0
.00161
5.16
5.96
27.2
6.20
18
40.0
1,620.0
.00128
6.51
7.51
34.4
4.92
19
36.0
1,290.0
.00101
8.21
9.48
43.3
3.90
20
32.0
1,020.0
.000802
10.4
11.9
54.9
3.09
21
28.5
810.0
.000636
13.1
15.1
69.1
2.45
22
25.3
642.0
.000505
16.5
19.0
87.1
1.94
23
22.6
509.0
.000400
20.8
24.0
109.8
1.54
24
20.1
404.0
.000317
26.2
30.2
138.3
1.22
25
17.9
320.0
.000252
33.0
38.1
174.1
0.970
26
15.9
254.0
.000200
41.6
48.0
220.0
0.769
27
14.2
202.0
.000158
52.5
60.6
277.0
0.610
28
12.6
160.0
.000126
66.2
76.4
350.0
0.484
29
11.3
127.0
.0000995
83.4
96
440.0
0.384
30
10.0
101.0
.0000789
105.0
121.0
554.0
0.304
31
8.9
79.7
.0000626
133.0
153.0
702.0
0.241
32
8.0
63.2
.0000496
167.0
193.0
882.0
0.191
33
7.1
50.1
.0000394
211.0
243.0
1,114.0
0.152
34
6.3
39.8
.0000312
266.0
307.0
1,404.0
0.120
35
5.6
31.5
.0000248
335.0
387.0
1,769.0
0.0954
36
5.0
25.0
.0000196
423.0
488.0
2,230.0
0.0757
37
4.5
19.8
.0000156
533.0
616.0
2,810.0
0.0600
38
4.0
15.7
.0000123
673.0
776.0
3,550.0
0.0476
39
3.5
12.5
.0000098
848.0
979.0
4,480.0
0.0377
40
3.1
9.9
.0000078
1,070.0
1,230.0
5,650.0
0.0299
Problem: You are required to run 2,000 feet of AWG 20 solid copper wire for a new piece of
equipment. The temperature where the wire is to be run is 25º C (77º F). How much
resistance will the wire offer to current flow?
