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American, British, and Metric
Standard Wire Gauge
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Sizes, Resistance, Voltage Drop, and Uses |
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Standard |
WG |
Approx.
O.D. |
Square |
Resistance |
Voltage Drop at 5 Amps |
Used For |
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Inches |
MM |
Inches |
MM |
Ohms/Ft |
Ohms/Meter |
Volts/Ft |
Volts/Meter |
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British |
12 |
0.1040 |
2.64 |
0.0085 |
5.48 |
0.001 |
0.003 |
0.0050 |
0.0164 |
Power Bus Lengths over 100ft |
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American |
10 |
0.1019 |
2.59 |
0.0082 |
5.26 |
0.001 |
0.003 |
0.0052 |
0.0171 |
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Metric |
25 |
0.0984 |
2.50 |
0.0076 |
4.90 |
0.001 |
0.004 |
0.0056 |
0.0183 |
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British |
13 |
0.0920 |
2.34 |
0.0066 |
4.29 |
0.001 |
0.004 |
0.0064 |
0.0210 |
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American |
12 |
0.0808 |
2.05 |
0.0051 |
3.31 |
0.002 |
0.005 |
0.0082 |
0.0272 |
Power Bus Lengths
50ft-100ft |
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British |
14 |
0.0800 |
2.03 |
0.0050 |
3.24 |
0.002 |
0.006 |
0.0084 |
0.0277 |
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Metric |
20 |
0.0787 |
2.00 |
0.0049 |
3.14 |
0.002 |
0.006 |
0.0087 |
0.0287 |
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British |
15 |
0.0720 |
1.83 |
0.0041 |
2.63 |
0.002 |
0.007 |
0.0104 |
0.0342 |
Power Bus Lengths
30ft-50ft |
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Metric |
18 |
0.0709 |
1.80 |
0.0039 |
2.55 |
0.002 |
0.007 |
0.0107 |
0.0353 |
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American |
14 |
0.0641 |
1.63 |
0.0032 |
2.08 |
0.003 |
0.009 |
0.0131 |
0.0432 |
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British |
16 |
0.0640 |
1.63 |
0.0032 |
2.07 |
0.003 |
0.009 |
0.0131 |
0.0433 |
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Metric |
16 |
0.0630 |
1.60 |
0.0031 |
2.01 |
0.003 |
0.009 |
0.0136 |
0.0447 |
Power Bus Lengths
00ft-30ft |
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British |
17 |
0.0560 |
1.42 |
0.0025 |
1.59 |
0.003 |
0.011 |
0.0172 |
0.0566 |
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Metric |
14 |
0.0551 |
1.40 |
0.0024 |
1.54 |
0.004 |
0.012 |
0.0177 |
0.0585 |
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American |
16 |
0.0508 |
1.29 |
0.0020 |
1.31 |
0.004 |
0.014 |
0.0208 |
0.0688 |
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British |
18 |
0.0480 |
1.22 |
0.0018 |
1.17 |
0.005 |
0.015 |
0.0233 |
0.0770 |
Short splices to Power
Bus. |
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Metric |
12 |
0.0472 |
1.20 |
0.0017 |
1.13 |
0.005 |
0.016 |
0.0241 |
0.0797 |
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American |
18 |
0.0403 |
1.02 |
0.0013 |
0.82 |
0.007 |
0.022 |
0.0331 |
0.1093 |
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British |
19 |
0.0400 |
1.02 |
0.0013 |
0.81 |
0.007 |
0.022 |
0.0336 |
0.1110 |
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Metric |
10 |
0.0394 |
1.00 |
0.0012 |
0.79 |
0.007 |
0.023 |
0.0347 |
0.1144 |
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British |
20 |
0.0360 |
0.91 |
0.0010 |
0.66 |
0.008 |
0.027 |
0.0415 |
0.1370 |
Short Splices and
Feeders |
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Metric |
9 |
0.0354 |
0.90 |
0.0010 |
0.63 |
0.009 |
0.028 |
0.0429 |
0.1417 |
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American |
20 |
0.0320 |
0.81 |
0.0008 |
0.52 |
0.011 |
0.035 |
0.0525 |
0.1734 |
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British |
21 |
0.0320 |
0.81 |
0.0008 |
0.52 |
0.011 |
0.035 |
0.0525 |
0.1734 |
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Metric |
8 |
0.0315 |
0.80 |
0.0008 |
0.50 |
0.011 |
0.036 |
0.0542 |
0.1789 |
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British |
22 |
0.0280 |
0.71 |
0.0006 |
0.40 |
0.014 |
0.045 |
0.0686 |
0.2264 |
Drop Feeders, Rail to
Bus |
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Metric |
7 |
0.0276 |
0.70 |
0.0006 |
0.39 |
0.014 |
0.047 |
0.0706 |
0.2330 |
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American |
22 |
0.0253 |
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