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needjuice

05:59AM | 06/14/05
Member Since: 06/13/05
3 lifetime posts
Bvelectrical
Here is my problem, if anyone can help that would be great!!

first of all I am using a 40 amp breaker to feed the disconnect, do i need to use 8awg wire or will 10 be sufficient? next... since it's a 220 hook up i'm confused as to what to do with the white(neutral wire) the box i purchased is labeled as a central air disconnect. it has 2 line terminals 2 load terminals and a grounding block. it also has a gfci outlet in it. I hope this enough info to get an answer, it's getting warm here and my wife is getting impatient with me!!

Billhart

08:50AM | 06/14/05
Member Since: 04/25/05
1915 lifetime posts
AC units are wired much different from general pupose circuits.

The wire size and circuit breakers are sized based on the unit label.

Post all of that data.

I have not run into the GFCI built into the disconnect and thus have not researched it, but AFIAK you need to run a separte 15 or 20 amp 120 v circuit for the receptacle (but it can be on other general purpose circuits).

Most AC's are 240 only and the neutral wire is not used.


needjuice

04:22PM | 06/14/05
Member Since: 06/13/05
3 lifetime posts
I suspected that the neutral wire would not be used but a little confirmation never hurts. as for the 8 or 10 awg part of itthe labal on the unit reads as follows

power supply 208-230 volts

1 ph 60 Hz

permissible voltage at unit 253-197 volts

min circuit amps 26

max crt-bkr 40A (hacr type recommended)

wich leads me to a new question what is hacr? I'm assuming it's like a ground fault or arc fault but do not know for sure. That is all i could find for electrical info on unit. ( I didn't look too hard) Here's another one if i use outdoor wiring should i still use a conduit, or is that redundant?

Billhart

05:01PM | 06/14/05
Member Since: 04/25/05
1915 lifetime posts
IIRC that stands for Heating Air Conditioning Rated. Or something like that.

Most residential breakers are so rated, but look on the breaker to verify it. It will be makred on the breaker.

"min circuit amps 26

max crt-bkr 40A (hacr type recommended)"

Yes, you can use #10 wire. The min circuit rating determines the wire size.

And of course the Max breaker is the max breaker that you can use on it.

What people don't realize is that circuit breakers are not to protect the load. They are to protect the wiring. The AC has internal overload protection. While a general purpose circuit can have multiple devices of different size plugged in and thuse overloading the wiring a dedicated circuit is limited to load.

The breaker is "oversized" because of the large starting current.

However, if you have a long wiring run, 50 ft or more it would not hurt to go up one size to #8.

"Here's another one if i use outdoor wiring should i still use a conduit, or is that redundant?"

If is in an area that is subject to phyisical abuse, then it needs to be protected. For example if it came out of the ground and in an area where it might get hit with a weed eater or mower.

But if it lays flat against the house and is more than a ft above ground it it it would be 'protected' by the house and 'normal' items would not get near it.

But you want to use a flexible conduit to run from the disconnect to the AC unit.


needjuice

04:29AM | 06/15/05
Member Since: 06/13/05
3 lifetime posts
I think that's about it then, you've managed to ease my fears and answer all my questions. I felt kinda silly having to ask in the first place, because, while i'm not an electrician by any means i have always been fairly adept at these things. Anyway, I guess what i'm saying is THANKS.
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