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Over the short distance of 25 feet no voltage drop calculations are needed to be made. A #10 copper conductor with an insulation rating of 60, 75 or 90 degrees C is rated at 30 amps respectively. 30 x 80% = 24 amps. If the load is under 24 amps then this size is the one to use. If the load current is greater than 24 amps then use a conductor one size larger. That would be a #8 which is rated at 45 amps x 80% for maximum wire loading = 36 amps.
For single phase 30 amps at 120 volts you would need a #8 copper wire with an insulation rating of 90 degrees C.
A #10 copper wire with an insulation factor of 60, 75 or 90 degrees C is rated at 30 amps.
I would recommend you use AWG #6 and a sub-panel for that long of a run.
This is a voltage drop question. To answer this question a voltage must be stated.
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The appropriate wire size for a 30 amp breaker is typically 10 gauge wire.
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The recommended wire size for a 30 amp 240v circuit is typically 10 gauge wire.
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The appropriate wire size for a 220v 30 amp circuit is typically 10 gauge wire.
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