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 Such as wire, tools, extension cords, and accessories. Search Amazon for your Electrical products The chart below displays information for motor wire size, breaker size, thermal overload ratings, and other data for
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