Central AC electrical hook up
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Central AC electrical hook up
Greetings to all , I'm new to the froum and just want run this by someone to make sure I'm correct.
My service panel is 200 amp GE.
AC installer requesting; a 220 20 amp circuit for the air handler and a 220 30 amp circuit for the outside condenser. My plan is to buy a GE 30 amp outside D/C box particular for A/C, 2 watertight pre-wired electrical whips, one from box to the condenser and the other inside to a 4" box to connect to the armored cable running from a double pole 30 amp breaker @ the service panel. have read that some appliances use 2 hot and a ground without a neutral , is this common for AC condensers? and should I use a 10-3 or a 10-2 wire for this?
For the 220 20amp circuit i'm planning to use a 12-3 with a double pole breaker @ the panel.
Thanks for your advice, Triple B
My service panel is 200 amp GE.
AC installer requesting; a 220 20 amp circuit for the air handler and a 220 30 amp circuit for the outside condenser. My plan is to buy a GE 30 amp outside D/C box particular for A/C, 2 watertight pre-wired electrical whips, one from box to the condenser and the other inside to a 4" box to connect to the armored cable running from a double pole 30 amp breaker @ the service panel. have read that some appliances use 2 hot and a ground without a neutral , is this common for AC condensers? and should I use a 10-3 or a 10-2 wire for this?
For the 220 20amp circuit i'm planning to use a 12-3 with a double pole breaker @ the panel.
Thanks for your advice, Triple B
Last edited by tripleb923; 01-20-06 at 11:15 AM. Reason: not completed
#2
You plan sounds good. All wiring on the 30A circuit should be #10 or larger if the distance from the panel to the A/C is great. A 60A disconnect might be cheaper than a 30A; I actually haven't even seen any 30s in a while.
Edit: Run 10/2 for the condensor and 12/2 for the air handler. A pure 220V circuit does not use a neutral wire, only hot-hot-ground.
Edit: Run 10/2 for the condensor and 12/2 for the air handler. A pure 220V circuit does not use a neutral wire, only hot-hot-ground.
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For all of those that I've done, I agree that neither should need a neutral, so 12/2 and 10/2 should work fine.
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Originally Posted by tach
dont forget about 210.63
#9
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A 30amp disconnect might not be large enough. It is based on either LRA or the Maximum overcurrent protection amps. I just wired my central A/C condensor, it also just needed 10awg, but I had to put in the 60 amp d/c.
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30amp disconnect vs 60 amp disconnect for central A/C
Thanks for the responses to my earlier question regarding central A/C hookups..... for the condenser>>I used #10/2 (2 hots & ground)BX wiring, the outside box is a square D 30 to 60 amp d/c ...my question is @ the main panel do I use a double pole 30 amp breaker or a 60 amp double pole breaker I was planning on using the 30 amp double pole breaker ...each pole is a 30 so it is a 60 @the d/c box ...right??? My main panel just has a neutral bar and I was reading in an earlier post that I could put the ground on that without worry....just checking.....
thanks for your patience,
Regards,Triple B
thanks for your patience,
Regards,Triple B
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You must use a 30A 2 pole breaker on your 10-2 circuit - just like you planned. A 2 pole 30A breaker is still a 30A breaker, not 60A.
60A non-fused disconnects are the most common for A/C units. And cheap. Is yours fused or non-fused? Most A/C's want non-fused. I'm not familiar with the dual rating on your d/c, that's all....
In the MAIN panel, if you only have one "bar", it is there for both neutral and ground connections. Which leads to a couple of questions... Are there other ground wires - bare copper - connected to this "bar"? What is the size of the main breaker?
60A non-fused disconnects are the most common for A/C units. And cheap. Is yours fused or non-fused? Most A/C's want non-fused. I'm not familiar with the dual rating on your d/c, that's all....
In the MAIN panel, if you only have one "bar", it is there for both neutral and ground connections. Which leads to a couple of questions... Are there other ground wires - bare copper - connected to this "bar"? What is the size of the main breaker?