I'd run larger wire and a higher amperage breaker. If the compressor is rated at 15 amps, it might need close to 30 amps at start-up. I ran a dedicated 30 amp breaker and 10/2 wires to my compressor/welder area. Then another identical set-up to my mill. The mill is actually 440v 3-phase that I'm running thru a phase converter.