100 amp breaker | 4/0 cable


  #1  
Old 07-16-14, 07:22 PM
F
Member
Thread Starter
Join Date: Jul 2014
Location: United States
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
100 amp breaker | 4/0 cable

installing a 100 amp sub panel, distance requires 4/0 conductors, the 100 amp breakers will not accept the 4/0, are there adapter lugs available to resolve this issue?
 
  #2  
Old 07-16-14, 07:26 PM
CasualJoe's Avatar
Member
Join Date: Jan 2010
Location: United States
Posts: 9,881
Received 188 Upvotes on 168 Posts
installing a 100 amp sub panel, distance requires 4/0 conductors, the 100 amp breakers will not accept the 4/0, are there adapter lugs available to resolve this issue?
Normally there are no larger lugs available for most residential 100 amp breakers. There are pin connectors available that must be special ordered and crimped to the feeder conductors, but the most commen method is to use split bolt or Polaris connectors in a junction box to reduce the wire size at the panel.
 
  #3  
Old 07-16-14, 07:31 PM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 13,988
Received 202 Upvotes on 176 Posts
4/0 AL is good for a 200 amp residential service , not 100 amps. Why is yours so large?
 
  #4  
Old 07-16-14, 07:43 PM
F
Member
Thread Starter
Join Date: Jul 2014
Location: United States
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
the sub panel is 220' from the main panel.
 
  #5  
Old 07-16-14, 11:28 PM
B
Member
Join Date: Oct 2013
Location: United States
Posts: 189
Upvotes: 0
Received 0 Upvotes on 0 Posts
Feeder

310.15B(7)(2) cannot be used for a dwelling feeder where the feeder does not carry the entire dwelling load. That being said, unless your feeder will be operating at a very high demand I don't see a requirement for #4/0 AL.

#1/0 AL with an 80 amp load would be a 2.94% Volt Drop. #1/0 will probably fit into your breaker.

If you have the #4/0 already installed then as suggested, install a junction box and reduce the conductor at each end for a short distance into the panels for termination.
 
 

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