30 amp breaker boxes7/3/2023 ![]() ![]() Why? You’d have to be running multiple machines at once on full power to achieve 20 amps. ![]() If you were to use 8/2 wire for a 150 foot run to a shed on a 20 amp breaker, chances are you wouldn’t notice the drop. ![]() Keep in mind that a 3% voltage drop is minimal. A 240 volt, 30 amp circuit would require 3/3 AWG wire.
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