![]() ![]() For example, if there are three 15-amp motors in the circuit, the ampacity Of the wire must be at least 125% of the full-load current of the largest motor, plus the sum of full-load currents for the rest of the motors. ![]() For circuits with multiple motors, the ampacity rating The NEC requires circuits supplying single motors to have an ampacity rating of greater than or equal to 125% of the full-load current rating of the motor. See Maximum Allowable Ampacities for Conductors in Raceway, Cable or Earth (30☌) for other insulation ratings. Note: The wire size in this table is based on 75☌ terminationsĪnd insulation. Full-Load Current and Circuit Protection Data for Three-Phase AC Motors Motor Horsepower The chart below displays information for motor wire size, breaker size, thermal overload ratings, and other data for ![]()
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