Was looking for a wiring diagram to re-hook up my compressor in my shop at home. This electrical wiring question came from: Brad, a Handyman from Endicott, New York. Air compressor electric motor electrical question. For 115 Volt compressors up to 2 HP and 230 Volt compressors up to 3 HP with a maximum of 15 Amps. Price $56.18. A wiring diagram is a simplified traditional pictorial depiction of an electric circuit. As for the compressor not starting I would check to make sure it does not have high head pressure where it is starting too soon, but rather adjust the limit switch so the start pressure is allowed to be lower. 2 watching. Generally speaking (and this is anecdotal as I am not an electrician – don’t pretend to be – and do not dispense electrical advice) the wires of a 120 volt circuit are going to be white, black and green. I tried to do it that way but the compressor will not come on. Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home. The default voltage of the air compressor must be identified so the circuit wiring may be configured properly. Thanks, Bob, Hi Bob, Free postage. We recently had the need, and stumbled through the process of, replacing a compressor pressure switch on one of our air compressors. Please see the Electrical Wire page of the website for the Table which describes the wire sizes and circuit sizes. When this information is identified then the circuit size and wire size may be determined. Built-in unloader for loadless starting. Electrical Wires for Home Wiring Projects. 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