Notices

Electrical Question

Old 07-18-2012, 12:40 PM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Jul 2009
Location: Raleigh NC
Posts: 1,257
Default Electrical Question

I am installing this AC/ Heat unit. What size wire should I run? 10 ga? I did some research online and that is what I am thinking is right.

http://www.homedepot.com/webapp/wcs/...specifications
jkapl001 is offline  
Old 07-18-2012, 12:49 PM
  #2  
Senior Member
 
Join Date: Jul 2011
Location: Baltimore, MD
Posts: 120
Default

12 should be fine.
Jerryh3 is offline  
Old 07-18-2012, 12:54 PM
  #3  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Dec 2001
Posts: 11,836
Default

Originally Posted by Jerryh3 View Post
12 should be fine.


As long as your run is relatively short.
Wolakrab is offline  
Old 07-18-2012, 01:07 PM
  #4  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Jul 2009
Location: Raleigh NC
Posts: 1,257
Default

Run is about 65' from panel. The heat load made me feel like 30 amp breaker and 10 ga. wire. Thoughts?
jkapl001 is offline  
Old 07-18-2012, 01:11 PM
  #5  
Senior Member
 
Join Date: Jun 2007
Location: Spring Hill, FL
Posts: 7,672
Default

20 amp breaker and you can still go with 10 wire if you feel better.
TheRealMacGyver is offline  
Old 07-18-2012, 01:31 PM
  #6  
Senior Member
 
Join Date: Aug 2011
Location: Kingston, MA
Posts: 1,836
Default

No need for #10...you will have virtually zero voltage drop over 65 feet.
burtonboards32 is online now  
Old 07-18-2012, 01:34 PM
  #7  
Senior Member
 
Join Date: Dec 2010
Posts: 2,501
Default

AMP draw is only 13.2 amps a 20 amp breaker is completely fine for that .
docters oarders is offline  
Old 07-18-2012, 01:52 PM
  #8  
Senior MemberCaptains Club Member
 
Join Date: Oct 2006
Location: Downeast, North Carolina
Posts: 6,131
Default

If you go to the LG website, the heating load amps are 16, I never trust the info from Home Depot/Lowe's.

Still, 240V/16amps/65' = 14 ga wire. I'd do 12 ga because you never know if you might want to put in a bigger one later. If you already bought 10 ga, that's fine.

As said before, 20 amp 2 pole breaker regardless of the wire, if you install a heavier load later, you'll change the breaker to match.

Last edited by davedowneast; 07-18-2012 at 01:53 PM. Reason: opps
davedowneast is offline  
Old 07-18-2012, 02:09 PM
  #9  
Senior Member
 
Join Date: Aug 2011
Location: Kingston, MA
Posts: 1,836
Default

Originally Posted by davedowneast View Post
If you go to the LG website, the heating load amps are 16, I never trust the info from Home Depot/Lowe's.

Still, 240V/16amps/65' = 14 ga wire. I'd do 12 ga because you never know if you might want to put in a bigger one later. If you already bought 10 ga, that's fine.

As said before, 20 amp 2 pole breaker regardless of the wire, if you install a heavier load later, you'll change the breaker to match.
Although he is right about 16 amp heating load and not trusting the Depot or Lowes, DO NOT listen to what he said about 14ga wire.

If you want a licensed electricians opinion, check out the cord on the actualy unit. It will most likely be a 20A plug, either three wire or four, then run either 12-2 (3 wire plug) or 12-3 (4-wire plug) on a 2-pole 20 amp breaker
burtonboards32 is online now  
Old 07-18-2012, 03:02 PM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Oct 2006
Location: Downeast, North Carolina
Posts: 6,131
Default

Originally Posted by burtonboards32 View Post
Although he is right about 16 amp heating load and not trusting the Depot or Lowes, DO NOT listen to what he said about 14ga wire.

If you want a licensed electricians opinion, check out the cord on the actualy unit. It will most likely be a 20A plug, either three wire or four, then run either 12-2 (3 wire plug) or 12-3 (4-wire plug) on a 2-pole 20 amp breaker
You're right!!! Absolutely!!! Actually, what I meant/should have said is that 16amps can be done with 14ga at that distanve/voltage. I do believe I said to run 12ga. From his post, I assumed he was doing rough wiring and I don't think the website said what the plug was. I haven't seen 4 wire plug for a window unit yet, doesn't mean it's not what it is. I don't hardly ever use 14ga, so every circuit in my house is capable of 20amps min.

Also, I almost always tell people to hire a licensed pro and I get slammed all the time. My licenses (let lapse in 2004 when I retired) covered house wiring, I was licensed to do a lot of stuff (steam fitting, gas piping, HVAC, solar and probably some other stuff). Still, I usually had an electrician wire the equipment. From my stand point, it was easier to let someone that did it every day than for me to keep up with changing codes and liability. I did do all my own low volt wiring. I didn't change my own oil either.
davedowneast is offline  
Old 07-18-2012, 05:11 PM
  #11  
Senior Member
 
Join Date: Aug 2011
Location: Kingston, MA
Posts: 1,836
Default

Originally Posted by davedowneast View Post
I almost always tell people to hire a licensed pro
Best advice yet, not only because I am a licensed "pro", but generally if someone is asking the very basics about how to do something, they should not be doing the work...no offense OP.
burtonboards32 is online now  
Old 07-18-2012, 05:29 PM
  #12  
Senior Member
 
Join Date: Jul 2011
Location: Baltimore, MD
Posts: 120
Default

Actually, wire sizing can get kind of tricky. Ampacity vs OCPD selection, bundling and temperature derating, NM vs THHN ratings, and the old 80% thingy can all trip up even licensed pros.
Jerryh3 is offline  
Old 07-18-2012, 06:04 PM
  #13  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Jul 2009
Location: Raleigh NC
Posts: 1,257
Default

Originally Posted by burtonboards32 View Post
Best advice yet, not only because I am a licensed "pro", but generally if someone is asking the very basics about how to do something, they should not be doing the work...no offense OP.
Nope none taken. I actually talked to an electrician this evening and he is going to come over and terminate everything for me. I am going to run the wire though.
jkapl001 is offline  
Old 07-18-2012, 06:19 PM
  #14  
Senior Member
 
Join Date: Aug 2011
Location: Kingston, MA
Posts: 1,836
Default

Originally Posted by Jerryh3 View Post
Actually, wire sizing can get kind of tricky. Ampacity vs OCPD selection, bundling and temperature derating, NM vs THHN ratings, and the old 80% thingy can all trip up even licensed pros.
Right, when wiring large buildings/complexes, like hospitals, shopping malls, skyscrapers, etc some things can get confusing, but houses are "cookie-cutter" and incredibly basic.
burtonboards32 is online now  

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 On
Refbacks are Off


Thread Tools
Search this Thread