400 Chapter 14
the strands. It takes a larger stranded wire to equal the
resistance of a solid wire.
14.2.6.1 Stranded Cables.Stranded cables are more flexible, and have greater
flex-life (flexes to failure) than solid wire. Table 14-4
shows some suggested construction values. The two
numbers (65 × 34, for example) show the number of
strands (65) and the gage size of each strand (34) for
each variation in flexing.Table 14-2. Parameters for Solid Wire from 4 AWG
to 40 AWG
AWG Nominal
DiameterCMA
(×1000)Bare
lbs/ft:/100
0 ftCurrent
AMM^2
Equiva-
lent4 0.2043 41.7 0.12636 0.25 59.57 21.1
5 0.1819 33.1 0.10020 0.31 47.29 16.8
6 0.162 26.3 0.07949 0.4 37.57 13.3
7 0.1443 20.8 0.06301 0.5 29.71 10.6
8 0.1285 16.5 0.04998 0.63 23.57 8.37
9 0.1144 13.1 0.03964 0.8 18.71 6.63
10 0.1019 10.4 0.03143 1 14.86 5.26
11 0.0907 8.23 0.02493 1.26 11.76 4.17
12 0.0808 6.53 0.01977 1.6 9.33 3.31
13 0.075 5.18 0.01567 2.01 7.40 2.62
14 0.0641 4.11 0.01243 2.54 5.87 2.08
15 0.0571 3.26 0.00986 3.2 4.66 1.65
16 0.0508 2.58 0.00782 4.03 3.69 1.31
17 0.0453 2.05 0.00620 5.1 2.93 1.04
18 0.0403 1.62 0.00492 6.4 2.31 0.823
19 0.0359 1.29 0.00390 8.1 1.84 0.653
20 0.032 1.02 0.00309 10.1 1.46 0.519
21 0.0285 0.81 0.00245 12.8 1.16 0.412
22 0.0254 0.642 0.00195 16.2 0.92 0.324
23 0.0226 0.51 0.00154 20.3 0.73 0.259
24 0.0201 0.404 0.00122 25.7 0.58 0.205
25 0.0179 0.32 0.00097 32.4 0.46 0.162
26 0.0159 0.253 0.00077 41 0.36 0.128
27 0.0142 0.202 0.00061 51.4 0.29 0.102
28 0.0126 0.159 0.00048 65.3 0.23 0.08
29 0.0113 0.127 0.00038 81.2 0.18 0.0643
30 0.01 0.1 0.00030 104 0.14 0.0507
31 0.0089 0.0797 0.00024 131 0.11 0.0401
32 0.008 0.064 0.00019 162 0.09 0.0324
33 0.0071 0.0504 0.00015 206 0.07 0.0255
34 0.0063 0.0398 0.00012 261 0.06 0.0201
35 0.0056 0.0315 0.00010 331 0.05 0.0159
36 0.005 0.025 0.00008 415 0.04 0.0127
37 0.0045 0.0203 0.00006 512 0.03 0.0103
38 0.004 0.016 0.00005 648 0.02 0.0081
39 0.0035 0.0123 0.00004 847 0.02 0.0062
40 0.003 0.0096 0.00003 1080 0.01 0.0049Table 14-3. Parameters for ASTM Class B Stranded
Wires from 4 AWG to 40 AWG
AWG Nominal
DiameterCMA
(×1000)Bare
lbs/ft:/
1000 ftCurrent
A*MM2
Equivalent4 0.232 53.824 0.12936 0.253 59.63 27.273
5 0.206 42.436 0.10320 0.323 47.27 21.503
6 0.184 33.856 0.08249 0.408 37.49 17.155
7 0.164 26.896 0.06601 0.514 29.75 13.628
8 0.146 21.316 0.05298 0.648 23.59 10.801
9 0.13 16.9 0.04264 0.816 18.70 8.563
10 0.116 13.456 0.03316 1.03 14.83 6.818
11 0.103 10.609 0.02867 1.297 11.75 5.376
12 0.0915 8.372 0.02085 1.635 9.33 4.242
13 0.0816 6.659 0.01808 2.063 8.04 3.374
14 0.0727 5.285 0.01313 2.73 5.87 2.678
15 0.0647 4.186 0.01139 3.29 4.66 2.121
16 0.0576 3.318 0.00824 4.35 3.69 1.681
17 0.0513 2.632 0.00713 5.25 2.93 1.334
18 0.0456 2.079 0.00518 6.92 2.32 1.053
19 0.0407 1.656 0.00484 8.25 1.84 0.839
20 0.0362 1.31 0.00326 10.9 1.46 0.664
21 0.0323 1.043 0.00284 13.19 1.16 0.528
22 0.0287 0.824 0.00204 17.5 0.92 0.418
23 0.0256 0.655 0.00176 20.99 0.73 0.332
24 0.0228 0.52 0.00129 27.7 0.58 0.263
25 0.0203 0.412 0.01125 33.01 0.46 0.209
26 0.018 0.324 0.00081 44.4 0.36 0.164
27 0.0161 0.259 0.00064 55.6 0.29 0.131
28 0.0143 0.204 0.00051 70.7 0.23 0.103
29 0.0128 0.164 0.00045 83.99 0.18 0.083
30 0.0113 0.128 0.00032 112 0.14 0.0649
31 0.011 0.121 0.00020 136.1 0.11 0.0613
32 0.009 0.081 0.00020 164.1 0.09 0.041
33 0.00825 0.068 0.00017 219.17 0.07 0.0345
34 0.0075 0.056 0.00013 260.9 0.06 0.0284
35 0.00675 0.046 0.00011 335.96 0.04 0.0233
36 0.006 0.036 0.00008 414.8 0.04 0.0182
37 0.00525 0.028 0.00006 578.7 0.03 0.0142
38 0.0045 0.02 0.00005 658.5 0.02 0.0101
39 0.00375 0.014 0.00004 876.7 0.02 0.0071
40 0.003 0.009 0.00003 1028.8 0.01 0.0046
*For both solid and stranded wire, amperage is calculated at 1 A
for each 700 CMA. See also Section 14.2.9.