The voltage losses in the chart below were calculated using Ohm's Law, and are theoretical. Safety margin should be built into the design to take into consideration deterioration of wire splices, power brownouts, etc.
FLOW (AMPS) |
VOLTAGE LOSS PER 1000' OF WIRE RUN (2 WIRES) | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
AMERICAN WIRE GAUGE (AWG) | ||||||||||||||||
18 | 16 | 14 | 14/12 | 14/10 | 12 | 10 | 8 | 6 | 4 | 2 | 1 | 0 | 00 | 000 | 0000 | |
0.1 | 1.28 | 0.80 | 0.51 | 0.41 | 0.35 | 0.32 | 0.20 | 0.13 | 0.08 | 0.05 | 0.03 | 0.03 | 0.02 | 0.02 | 0.01 | 0.01 |
0.2 | 2.56 | 1.61 | 1.01 | 0.82 | 0.70 | 0.63 | 0.40 | 0.25 | 0.16 | 0.10 | 0.06 | 0.05 | 0.04 | 0.03 | 0.03 | 0.02 |
0.3 | 3.83 | 2.41 | 1.52 | 1.23 | 1.06 | 0.95 | 0.60 | 0.38 | 0.24 | 0.15 | 0.10 | 0.08 | 0.06 | 0.05 | 0.04 | 0.03 |
0.4 | 5.11 | 3.22 | 2.02 | 1.64 | 1.41 | 1.27 | 0.80 | 0.50 | 0.32 | 0.20 | 0.13 | 0.10 | 0.08 | 0.06 | 0.05 | 0.04 |
0.5 | 6.39 | 4.02 | 2.53 | 2.06 | 1.76 | 1.59 | 1.00 | 0.63 | 0.40 | 0.25 | 0.16 | 0.13 | 0.10 | 0.08 | 0.06 | 0.05 |
0.6 | 7.67 | 4.83 | 3.03 | 2.47 | 2.11 | 1.90 | 1.19 | 0.75 | 0.48 | 0.30 | 0.19 | 0.15 | 0.12 | 0.10 | 0.08 | 0.06 |
0.7 | 8.95 | 5.63 | 3.54 | 2.88 | 2.46 | 2.22 | 1.39 | 0.88 | 0.57 | 0.35 | 0.22 | 0.18 | 0.14 | 0.11 | 0.09 | 0.07 |
0.8 | 10.22 | 6.43 | 4.04 | 3.29 | 2.82 | 2.54 | 1.59 | 1.00 | 0.65 | 0.40 | 0.26 | 0.20 | 0.16 | 0.13 | 0.10 | 0.08 |
0.9 | 11.50 | 7.24 | 4.55 | 3.70 | 3.17 | 2.86 | 1.79 | 1.13 | 0.73 | 0.46 | 0.29 | 0.23 | 0.18 | 0.14 | 0.11 | 0.09 |
1.0 | 12.78 | 8.04 | 5.05 | 4.11 | 3.52 | 3.17 | 1.99 | 1.26 | 0.81 | 0.51 | 0.32 | 0.25 | 0.20 | 0.16 | 0.13 | 0.10 |
2.0 | 25.56 | 16.08 | 10.10 | 8.22 | 7.04 | 6.35 | 3.98 | 2.51 | 1.62 | 1.01 | 0.64 | 0.51 | 0.40 | 0.32 | 0.25 | 0.20 |
3.0 | 38.34 | 24.13 | 15.15 | 12.34 | 10.56 | 9.52 | 5.97 | 3.77 | 2.42 | 1.52 | 0.96 | 0.76 | 0.60 | 0.48 | 0.38 | 0.30 |
4.0 | - | 32.17 | 20.20 | 16.45 | 14.08 | 12.70 | 7.96 | 5.02 | 3.23 | 2.02 | 1.28 | 1.02 | 0.80 | 0.64 | 0.50 | 0.40 |
5.0 | - | 40.21 | 25.25 | 20.56 | 17.60 | 15.87 | 9.95 | 6.28 | 4.04 | 2.53 | 1.60 | 1.27 | 1.00 | 0.80 | 0.63 | 0.50 |
6.0 | - | 48.25 | 30.30 | 24.67 | 21.12 | 19.04 | 11.94 | 7.54 | 4.85 | 3.04 | 1.92 | 1.52 | 1.20 | 0.96 | 0.76 | 0.60 |
7.0 | - | - | 35.35 | 28.78 | 24.64 | 22.22 | 13.93 | 8.79 | 5.66 | 3.54 | 2.24 | 1.78 | 1.40 | 1.12 | 0.88 | 0.70 |
8.0 | - | - | 40.40 | 32.90 | 28.16 | 25.39 | 15.92 | 10.05 | 6.46 | 4.05 | 2.56 | 2.03 | 1.60 | 1.28 | 1.01 | 0.80 |
9.0 | - | - | 45.45 | 37.01 | 31.68 | 28.57 | 17.91 | 11.30 | 7.27 | 4.55 | 2.88 | 2.29 | 1.80 | 1.44 | 1.13 | 0.90 |
10.0 | - | - | 50.50 | 41.12 | 35.20 | 31.74 | 19.90 | 12.56 | 8.08 | 5.06 | 3.20 | 2.54 | 2.00 | 1.60 | 1.26 | 1.00 |
COPPER WIRE RESISTANCE (OHMS PER 1000' OF SINGLE WIRE) @ 68ºF | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
WIRE GAUGE (AWG) | |||||||||||||||
18 | 16 | 14 | 14/12 | 14/10 | 12 | 10 | 8 | 6 | 4 | 2 | 1 | 0 | 00 | 000 | 0000 |
6.390 | 4.021 | 2.525 | 2.056 | 1.760 | 1.587 | 0.995 | 0.628 | 0.404 | 0.253 | 0.160 | 0.127 | 0.100 | 0.080 | 0.063 | 0.050 |
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