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10-2 or 10-3 Wire for AC

Posted: Mon Mar 14, 2011 1:42 pm
by kailor
Installing an Intertherm AC-only package unit. The label on the unit says "MCA = 30A". Should I use 10-2 or 10-3 wire from circuit panel?

Re: 10-2 or 10-3 Wire for AC

Posted: Mon Mar 14, 2011 6:38 pm
by Bill
Hi,
A 10-2 wire should be fine. Just hook up the two hot leads and the ground.
Thanks,
Bill

Re: 10-2 or 10-3 Wire for AC

Posted: Mon Mar 14, 2011 7:57 pm
by Greg
2 HOT leads??? If it is a 110v you have a hot a neutral and a ground. On a 220v you have 2 hot a neutral and a ground. The ground and neutral ARE NOT the same thing.

Greg

Re: 10-2 or 10-3 Wire for AC

Posted: Wed Mar 16, 2011 7:48 am
by Rod
1.This is electrical if you are not sure sure hire a professional.
2. I thought this topic was taboo on this forum?

Bill is correct, on a Nordyne (Intertherm, Miller & Broan) they are 220 wired with 2 hots and a ground. No neutral. The 2 hots are also known as L1 & L2.

Neutrals are "typically" not used on a 220 system for items such as central air and water heaters. They are however used on most newer electric stoves. The installation manual should always be read (AND UNDERSTOOD) to insure proper wiring and safety.

You need to make sure you install a disconnect box outside. This is to comply with code and also makes servicing the unit easier should power need to be turned off.

It is my advice if you are not 100% of how to do this then hire an electrician.

Good Luck
Rod

Re: 10-2 or 10-3 Wire for AC

Posted: Wed Mar 16, 2011 8:43 am
by kailor
Thanks for the post Rod. I'm currently in the process of getting quotes from licensed professionals. In an attempt to save money, I want to install breaker (I've done this before) and run the wire to location of unit. I've already installed the return air grill and duct-end-piece and the damper. I would let the licensed professional wire the breaker in the panel, the outside disconnect and the unit itself. The MAC label on the actual unit specifies 30A; thus, a 10 ga. wire is necessary along with a 2-pole 30A Siemens circuit breaker. I just didn't know if I need to purchase and run a 10-2 or a 10-3 wire.

Re: 10-2 or 10-3 Wire for AC

Posted: Tue Mar 22, 2011 2:54 pm
by kailor
Answer: 10-2 with ground (orange-sheathed romex)
Quite expensive I might add!

Re: 10-2 or 10-3 Wire for AC

Posted: Fri Apr 15, 2011 12:40 am
by pravin
I'm wondering why you chose 10/2 wire for three lights and a plug? This is overkill, unless the plug is to run a big motor, battery charger, etc.



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