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You would need at least 3 AWG at 120 volts, giving you a 4.8 percent voltage drop at the maximum load of 37.5 amps (using 30 Amps at the ordinary 80 percent rated capacity of the circuit). For 240 volts you would only need 6 AWG.

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11y ago
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12y ago

This is a voltage drop question. A voltage must be stated to answer this question.

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15y ago

See discuss question below.

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Q: What size wire is needed for 15 amps over a distance of 300 feet?
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