For copper wire with a 110V circuit, and allowing only a 3%
voltage drop, you need the following gauge wire for the load
specified:
Load in Distance to load in feet amps <50 50 75 100 125 150 200 250 -------- ----------------------------------------------------------- 15 14 12 10 10 8 8 6 6 20 12 12 10 8 8 6 6 4 25 10 10 8 8 6 6 4 4 30 10 10 8 6 6 4 4 3 40 8 8 6 6 4 4 3 2 50 8 8 6 4 4 3 2 1 Resistance of Copper wire: AWG Ohms per 1,000 feet ------ ---------------------- 14 2.57 12 1.62 10 1.02 8 .640 6 .410 4 .260 3 .205 2 .162 1 .129 0 .102 2/0 .0811 3/0 .0642 4/0 .0509
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