Overcurrent protection for a septic pump

[noel westphal]

Have a question about the proper circuit breaker size for a septic lift pump, the pump is a 1 1/2 horse power and has a max amp rating of 15.7 amps the control panel has a factory installed 30 amp Square D breaker inside it as a disconnect. If you used 10-2 UF to feed this could you put it on a 30 amp breaker or would it have to be a 20 or 25 amp. Thanks, Noel

 

[John Valdes]

30 amp breaker is all you need at 15.7 amps. 10/2 is appropriate for a single phase motor at the nameplate current. Put a non-fusible disco at the pump.

15.7 amps x 1.75 = 27.4 amps. Thus 30 amp breaker.

 

[noel westphal]

Thanks John, would I need the non-fusible disconnect at the pump being that I have a 30 Amp breaker inside the control panel? Also the circuit breaker panel that the pump is being fed from is on the outside of the house, is within 50 feet, and in site of the septic pump access cover.:-?

 

[infinity]

You may not need #10 conductors, you could use #14 conductors if voltage drop isn't an issue.,