Motor Breaker Sizing...
Motor Breaker Sizing...
(OP)
Quick question. Can I put a 40A Breaker on a 20HP rated Inverter driving a 20HP fan motor??? The Inverter is an Allen Bradely 1336 Plus 2 model.
Also, is RWU90 #10 wire OK?
Also, is RWU90 #10 wire OK?





RE: Motor Breaker Sizing...
(#10 AWG cannot be used with a 40A breaker)
RE: Motor Breaker Sizing...
RE: Motor Breaker Sizing...
1. The circuit length is normally given a consideration for allowable voltage drop.
2. 32.5 FLA x 1.25 = 40.625 A. Therefore, the conductor next size is appropriate, e.g. #6AWG @60°C, 55A.
3. Check with the manufacturer for the recommended protection for the drive.