What size wire for 30 amp breaker depends on the electrical load and voltage drop. What Gauge Wire for 30 amp 100 Feet Away? These minimum 30 amp wire size chart are safe for the current level flowing through the conductor. A 60-amp double-pole breaker requires a minimum of 6-gauge wire.A 40-amp circuit double-pole breaker requires a minimum of 8-gauge wire.A 30-amp single-pole and double-pole breakers require a minimum of 10-gauge wire.A 20-amp single-pole breaker requires a minimum of 12-gauge wire.
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