I just got an Ingersoll Rand SS4L5 230V Standalone Air Compressor, and I need some spot-checking on my wiring configuration from my panel. First let's get the details out of the way:
I'm not sure from the image what the starting amps required are, but it looks like running amps are ~21.1A.
The install location is roughly 40' from the breaker through the walls/ceiling. Current thought is:
Conductors sized at 125% motor load current, which would be ~27A, so rounding to 30A would give me 10/2 w/g CU NM-B Romex. I've anecdotally seen people using 8ga here, so I'm not sure if that is overzealous on safety or not...
As for the breaker, this article references NEC 440.22, saying that 225% is an OK rating to target to get over the starting current required. I have absolutely zero idea if this is too much, or if I need to bump down to 175%.
225% would give me ~47A, and 175% would give me ~37A, so the difference between a 40A and a 50A breaker.
I've seen forums recommend 10ga romex and 60A breakers, 8ga Romex on 40A, 10's on a 40A (and when that failed he ran 6ga on a 60A)....
I just want to avoid tripping breakers on startup and burning my garage down...
Thanks for the help!