230 V Motor Wiring Check


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Old 01-24-16, 10:46 AM
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230 V Motor Wiring Check

Wiring a another 230v motor, 5 HP, 20.6 Amps, 1.15 Service Factor is 23.7 FLA, So 5500 watts max with a magnetic starter/overload protector.

Im thinking a run distance of only 15 feet means #8 copper wire and a 40 amp double pole breaker. Does this sound right or is the breaker/wire not strong enough to handle the motors potential start up amperage which Im told may be 3 times higher than the FLA but only for a few seconds.
 
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Old 01-24-16, 10:55 AM
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Actually #10 on a 30amp breaker. The start up current is only momentary and the breakers are "slow" trip to handle motor start up.
 
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Old 01-25-16, 11:23 AM
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The Schneider Electric calculator I frequently use says #10 wire and up to a 60 amp breaker. I think I'd start with a 40 amp breaker and try it from there. I am just assuming this is a single phase motor.

Single Phase Motor Data
 
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Old 01-25-16, 11:25 AM
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Yes Ray mentioned the #10 wire is the minimum size wire required and 30A would be smallest breaker you should try. Code will allow up to a 60A breaker for that motor, but you need to follow a test procedure with smaller breaker sizes to see what is the smallest sized breaker that will allow the motor to start without tripping.
 
 

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