Neutral Size for Main Panel


Old 11-11-06, 12:50 PM
Thread Starter
Join Date: Nov 2006
Posts: 5
Received 0 Votes on 0 Posts
Neutral Size for Main Panel

Existing conductors to a 125 Amp main panel:

#2 CU - Load
#6 CU - Neutral

The calculated load for the panel is 107 Amps - is the size of the existing neutral OK...?

The A/C is fed directly from the outdoor load center, so I did not include it in the load calculations...

I have heard of a rule of thumb where it should be no less than 2 sizes under the load conductors...
Sponsored Links
Old 11-12-06, 07:30 PM
hornetd's Avatar
Join Date: Aug 2001
Location: Maryland
Posts: 695
Received 0 Votes on 0 Posts
Reduced neutral conductor size

You need to find out which hot conductor is carrying the largest amount of 120 volt loads. The neutral needs to be large enough for the larger of the two ungrounded conductors 120 volt loads because that is the largest load it may have to carry. Do not add up breaker settings because the resultant figure is meaningless. 240 volt loads do not subject the neutral to any additional current. So as long as the neutral is large enough to carry the larger of the actual 120 volt loads it will be fine.
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:
Your question will be posted in: