Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-15-2008, 08:10 AM   #1
Newbie
 
Join Date: Oct 2008
Posts: 1
Share |
Default

Which wire from the main breaker to the A/C condenser?


I am installing electrical for a new A/C system on a residential rehab project. I am confused about running power from the main breaker box to the 2.5 ton condenser. I was told I needed a 220 line with a double 20A breaker. Because I am running less than twenty feet away, I was told to purchase 10/2 or 12/2 outdoor wire. I must be missing something. Typically, a 220 line has 2-hot wires to attach to the respective contacts on the double breaker. Obviously, 2-wire has only 1-hot conductor. My confusion does not end there. If I were to use 10/3 or 12/3 wire, which would accommodate the breaker, there are only two leads at the condenser whip/disconnect box to tie back into. How do I resolve this?

slwalsh is offline   Reply With Quote
Old 10-15-2008, 09:44 AM   #2
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,615
Default

Which wire from the main breaker to the A/C condenser?


the 2 wire will be blk/white + copper ground,but still able to handle your load run out.the 3 wire will give you the blk/white/red and that copper ground $$$......blk/red for the 220volts single phase,and an optional neutral but it is 220V out there and you'll end up not hooking it to anything in the condenser,and the copper ground will screw into the cabinet.so go with the 2 wire and tape the white over with red at both ends or maybe you can get a 2 wire with the blk/red already...it is the sizing of the wire #10 or #12 thats critical the colores are for inspections and service people latter on to ID.if i went up to a condenser with a blk/white into the L of a contactor i would think this guy could of used any color to wrap the white to signify 220V..even a red marker to paint the wire6" from the connections at both ends.

biggles is offline   Reply With Quote
Old 10-15-2008, 01:33 PM   #3
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,544
Default

Which wire from the main breaker to the A/C condenser?


The guy that told you to get 10/2, meant 10/2 with ground.

As above.
By code, the white wire must be made a different color, other then white, or green.
beenthere is offline   Reply With Quote
Reply

Tags
air conditioning, heating and cooling, hvac, service panel, wiring


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
This doesnt seem right. JoulesWinfield Electrical 27 07-26-2009 07:40 PM
hooking up dryer....bronx ny code SURFBUG Appliances 6 10-14-2008 09:41 PM
Melted Service Entrance Wire in Panel theatretch85 Electrical 13 08-22-2008 10:37 AM
main lug vs main breaker for sub panel diyll Electrical 1 01-17-2008 08:18 PM
Wire size and Breaker size for remodel ?? Skydmark1 Electrical 12 12-15-2007 05:00 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.