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The following is for distances up to 50 feet, longer runs would have to take voltage drop into consideration. To give an accurate answer the nameplate amperage should be known. The code book states that a single phase 5 HP motor at 230 volts draws 28 amps. You would need a conductor capable of handling 35 amps (or 125% of the nameplate current). This would be a #8 copper conductor with an insulation factor of 90 degrees C which is good for 45 amps. The fusing for this circuit would be 90 amp non-time delay or 50 amp type D time delay fuse. A two pole breaker for 230 volts would be sized at 70 amps.

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