DIY Home Improvement, Remodeling & Repair Forum

DIY Home Improvement, Remodeling & Repair Forum (
-   Electrical and Wiring (
-   -   Compressor Wiring (

Raindem 09-24-2011 11:04 AM

Compressor Wiring
2 Attachment(s)
Greetings electrical gurus. I'm attempting to install my brand new Ingersoll Rand 220v compressor. The installation instructions are useless. They just point to the connection and say "to power supply" and of course tell you to hire a qualified electrician. I have a lot of DiY experience with 120v circuits but not 240v.

So here's what I got. The first picture is my nearby 220v wall outlet. The Black-Red wires have 240v, and the Black-White & Red-White have 120v. The 2nd picture show my compressors electrical box. It has a black, a white, and a ground. So I was going to buy a 220v extension cord but not sure how I wire it up.


fatham 09-24-2011 06:40 PM

Your new compressor is presently wired for 220.The new power cord needs to connect the black and red (220v) lines from the receptacle, ( as shown in Your left picture) , to the "line in" lugs in the contactor shown in the right photo.
The green wire (Grounding wire )connects from the copper terminal in the receptacle, to the green wire terminal in the contactor housing box.
I hope that is what You are looking for.


kok328 09-24-2011 06:42 PM

The compressor will need 120V to the black wire and 120V to the white wire from the opposing leg of the power source.
In other words, hook the red wire from the wall outlet to the black or white wire on the compressor and then hook the black wire from the wall outlet to the remaining (white or black) wire on the compressor.
Finally, hook the bare copper wire from the wall outlet to the green wire on the compressor.

Raindem 09-24-2011 10:02 PM

Thanks, that's what I was looking for. One more question, what does the white wire on the receptacle hook to?

kok328 09-25-2011 09:02 AM

The white wire will not be used in this application.
Terminate it with a wire nut and stuff it back into the box or if you are going to wire up a cord to match the outlet, just leave it where it is.

Raindem 09-25-2011 11:45 AM

Yes, I was going to use one of those pre-wired plugs from ACE. Thanks.

Raindem 09-29-2011 02:33 PM

1 Attachment(s)
Just to make sure I'm doing this right I attached the motor plate for my compressor.

The existing feed wire (photo #1 of my 1st post) is 6 ga. with a 50 amp breaker. The wire I plan to attach to the compressor is 10 ga., which seems about the same size as the factory wires that are there (photo #2 of my 1st post). I then plan to swap my 50 amp fuse for a 30 amp because a 50 amp breaker for 10 ga. wire seems rather large.

Does this sound like a reasonable plan?

Thanks again.

kok328 09-29-2011 03:03 PM

Wire it with a 10 gauge cord and a 30 amp breaker/fuse.

Raindem 09-29-2011 04:27 PM

How do you remove the breaker? I have the panel pulled off (power is shut off) and the wires are disconnected. But I don't see how the breaker is attached to the bus.

Edit: Nevermind, figured it out. Thanks.

BigChuck 10-02-2011 08:58 PM

Glad you got it figured out Raindem, I'm mostly here to learn, but I'd be calling an electrician for my own personal safety! haha

All times are GMT -6. The time now is 10:55 PM.