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Assuming that the motor is single phase 3 HP operating on 120 volts. A couple of things come into play on this installation. One it is a motor load. Code states that motor loads have to have feeders rated at 125% of the motors full load amps (FLA). The other condition is breaker sizing.

With a motor amperage of 33 amps and using a feeder of 125% means 33 x 125% or 1.25 = 41.25 amps for wire sizing.

A #10 copper wire with an insulation rating of 60, 75, or 90 degrees C is rated at 30 amps, this does not fall within the required wire size.

A #8 copper wire with an insulation factor of 75 or 90 degrees C is rated at 45 amps, this falls within the required wire size.

Breaker sizing is taken from the motors FLA. For a motor with 34 amps full load, a 110 amp non time delay fuse, 60 amp time delay "D" fuse or a 70 amp breaker is required to meet code regulations. The reason for over sizing the breaker or fuses is to overcome the motor high current, which can rise to 300% of the motor's FLA, on start up.

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