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Tool Talk Discussion Forum

Re: Air compressor trouble

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Greg K

03-27-2013 16:14:46

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Sorry I will clarify myself a bit here. It is a 10 hp single phase motor, nameplate rating of 42 amps. All of the capacitors, both start and run, have been replaced. The unloader valve is working fine. I was checking this by opening the pressure relief valve, and in the process of this I stumbled on the fact it will start if it has somewhere for the air to go besides the tank. The check valve appears to be working fine. The breaker that it is tripping is a 60 amp breaker. The shed is fed with #4 URD on a 70 amp breaker, which is too big by the way I read the code. The #4 feeder is about 80" long. It is possible that there is not enough service to the building, but I was wondering if I was missing some other possibility.

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John T

03-28-2013 06:14:53

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 Re: Air compressor trouble in reply to Greg K, 03-27-2013 16:14:46  
Since allllllllll else is fine according to your info (I'm taking you at your word), Id be tempted to try a higher amp rated breaker (that feeds the compressor), just high enough to allow it to start...Best I recall you can use like 175% of the size that protects the feeders so a 70 amp breaker would be close to NEC limits (If motor branch circuit wiring feed wires are rated 40 amps). Normally the branch circuit overload protection device is sized to limit feeder current to the wires ampacity (like if the wires ampacity is 40 amps you use a 40 amp breaker) HOWEVER a branch circuit used to feed a motor can use a breaker somewhat higher rated then normal......AS BEST I RECALL NO WARRANTY

NOTE AGAIN Im rusty on the NEC so check with it and local authority and more current professional electricians and engineers is my advice.. I'm workin with an oldddddddddd brain here remember lol

John T

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