Running line outside

Reply

  #1  
Old 12-01-09, 02:18 PM
S
Member
Thread Starter
Join Date: Jan 2007
Location: MA
Posts: 514
Received 0 Votes on 0 Posts
Running line outside

Looking to add some power in my garage. I have an empty slot in my panel so that is no problem. Panel is at opposite end of house from garage on outside wall. Easy way would be punch it outside and run it down back of house and then punch into garage as everything is finished inside between. I would run line approx 7' of ground. Is there any code issue that I would be violating by doing this? I am in MA. Also I am running 220V single phase for a heater. Distance is approx 60' any input on gauge would be helpful, save me asking supply house.

Thanks
 
Sponsored Links
  #2  
Old 12-01-09, 02:53 PM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 33,583
Received 13 Votes on 11 Posts
You must do it in conduit using THWN single conductor wires or use UF buried 24" and protected by short lengths of conduit where it exits the ground and goes in. Size would depend on load of heater. The conduit if used could either be fastened to the wall or buried 18" for better appearance. You can not use UF cable unprotected stapled to the outside wall.

Edit: What constitutes protected means for UF is up to the AHJ. See the pros comment below.
 

Last edited by ray2047; 12-01-09 at 05:24 PM.
  #3  
Old 12-01-09, 03:02 PM
I
Forum Topic Moderator
Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,943
Received 43 Votes on 41 Posts
Originally Posted by smallengineguy View Post
Looking to add some power in my garage.
Attached or detached from the building with the panel?

I would run line approx 7' of ground. Is there any code issue that I would be violating by doing this?
Assuming attached garage -- you would probably be okay with the UF-B* cable up 7' off the ground as this is above the area where it is generally considered "subject to damage". You would need to ask the inspector for confirmation though as it is up to interpretation. Personally I would probably use conduit and THWN for better protection physically and from the elements also for future expansion.

any input on gauge would be helpful
Depends entirely on the size of the heater and the manufacturer specs.

Generally for 240V heaters #14 can supply up to 2880W, #12 up to 3840W, and #10 up to 5760W; however those numbers could change a bit depending on the exact specs of the heating unit.

* Note: Must be type UF-B cable with UV / sunlight resistant marking -- NOT NM-B indoor "Romex".
 
  #4  
Old 12-01-09, 04:51 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,151
Received 87 Votes on 74 Posts
Just to clarify, you would need to run a feeder out to the garage. You cannot run 2 circuits.

If I misinterpreted your intention be followup.
 
  #5  
Old 12-01-09, 05:21 PM
ray2047's Avatar
Member
Join Date: Mar 2006
Location: USA
Posts: 33,583
Received 13 Votes on 11 Posts
PCboss is assuming a detached garage I believe. I assumed an attached garage. Which it is is very important to the final answer.
 
  #6  
Old 12-01-09, 06:26 PM
S
Member
Thread Starter
Join Date: Jan 2007
Location: MA
Posts: 514
Received 0 Votes on 0 Posts
It is a attached garage. Only looking a (2) 6' sections of electric baseboard 1500W each. So #12 should suffice? I will run it in conduit
 

Last edited by smallengineguy; 12-01-09 at 06:44 PM.
  #7  
Old 12-01-09, 07:26 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 15,151
Received 87 Votes on 74 Posts
OK, you want to add 3000 watts of heat to an attached garage?

3000 watts at 240 volts = 12.5 amps. Even using the 125% you are less than 16 amps. A single 20 amp 240 volt circuit would suffice.
 
Reply
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


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: