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The minimum wire size allowable would be 10 gauge. For a 75 foot run however, the voltage drop would be 5.31 volts. This exceeds the NEC recommendation of no more than 3% (3.6v) so while it is not legally required, for best efficiency, you should run 8 gauge.

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16y ago

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A #8 copper or #6 aluminium conductor will limit the voltage drop to 3% or less when supplying 30 amps for 75 feet on a 120 volt system.

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9y ago
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Q: I am running 120v 30amp service 75' what gauge wire is needed?
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