subpanel wire size?

Reply

  #1  
Old 09-27-05, 02:04 PM
myvalk
Visiting Guest
Posts: n/a
subpanel wire size?

put up an addition attached to the house. have an 8 breaker sub panel in there. 5 - 15 amp bkrs. for lites and recepticals and a smoke detector. and 2 - 20 amp bkrs for electric heat. and 1 - 20 amp for a spare.
question is ...what size cable to run to power this sub panel?
#4 ? #6? and what size breaker for that cable from my main box.?

thanx in advance
 
Sponsored Links
  #2  
Old 09-27-05, 02:35 PM
Member
Join Date: Sep 2000
Location: United States
Posts: 18,497
Received 0 Votes on 0 Posts
How many square feet are in the addition?
Is there a bathroom in the addition?
What other rooms are in the addition?
Is the electric heat 120-volt or 240-volt? How many watts?How far is the subpanel from the main panel (measured along the cable)?

I'm going to guess that the answer is 6/3 cable and a 60-amp double-pole breaker, but the answers to the above questions will help ensure that this is the right answer.
 
  #3  
Old 09-27-05, 04:13 PM
myvalk
Visiting Guest
Posts: n/a
ok... one big room no bath or kitchen.. just as i said lites and outlets.
one mistake was the heat. two branches, 220v each 20 amp brkr. 3500 watts each so its four 20's for the heat, not two. and one 20 for a spare.
cable run is 20 feet.
room is 24 x 20 feet
i think that does it.... thanx
 
  #4  
Old 09-27-05, 06:37 PM
Member
Join Date: Sep 2000
Location: United States
Posts: 18,497
Received 0 Votes on 0 Posts
The room is 480 square feet. That will require about 500 watts of lighting. You'll have 7000 watts of heating. You'll need at least 8 receptacles, and it's normal to allocate about 180 watts for each, so that's about another 1500 watts. That adds up to 9000 watts. To allow flexibility and expansion, let's double the non-heating load. That gives us 11000 watts. That's about 45 amps. So I'll stick with my recommendation for 6/3 from a 60-amp breaker.
 
  #5  
Old 09-28-05, 02:07 AM
myvalk
Visiting Guest
Posts: n/a
thank you... thats what i'll do.
 
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
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: