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Old 03-22-2008, 05:30 PM   #1
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240V 30 amp Room A/C: 10-2 or 10-3?


Hi,
I'm putting a thru the wall air conditioner in my garage\shop, probably an 18,00 btu unit which usually req 240V and 30 amps. The plug types I have seen on these are all 3 prong. I read somewhere that most modern 240V circuits are 4-wire, ie. 10-3. Since the plugs are only 3 prong, will the 10-2 suffice?

Thanks,

Grommet

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Old 03-22-2008, 06:00 PM   #2
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240V 30 amp Room A/C: 10-2 or 10-3?


A/C units generally are straght 240 volt, which would only require 10/2.

The best thing to do would be to pick out a unit first, then you would know the wiring requirments for that model.

You can still run 10/3 if you like, and if you get a model that is 120/240v (not very common) you will be set... if not then you would not use the white (neutral) wire, but it would be there for future expansion.

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Old 03-22-2008, 06:04 PM   #3
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240V 30 amp Room A/C: 10-2 or 10-3?


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Originally Posted by Grommet View Post
Hi,
I'm putting a thru the wall air conditioner in my garage\shop, probably an 18,00 btu unit which usually req 240V and 30 amps. The plug types I have seen on these are all 3 prong. I read somewhere that most modern 240V circuits are 4-wire, ie. 10-3. Since the plugs are only 3 prong, will the 10-2 suffice?

Thanks,

Grommet
Yes 10/2 will suffice. Two Hot wires and a Ground wire.
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Old 03-22-2008, 07:11 PM   #4
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240V 30 amp Room A/C: 10-2 or 10-3?


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I read somewhere that most modern 240V circuits are 4-wire, ie. 10-3.
NO, NOT 240v applainces.

This applies to 120/240v electric cooking appliances and dryers ONLY, and not all of them. Some are straight 240v.
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Old 03-25-2008, 03:07 PM   #5
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240V 30 amp Room A/C: 10-2 or 10-3?


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