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100A sub redux #86716
11/24/03 04:50 PM
11/24/03 04:50 PM
B
buckyswider  Offline OP
Junior Member
Joined: Nov 2003
Posts: 2
Cold Point, PA, USA
Wow, spent the afternoon searching the archives re 100A subpanel. Bazillions of posts, opinions, and interpretations, but no consensus, but the safe way(s) to go are either:

1) Install 90A cb on feeder panel for #4 CU;
or
2) Use #3 CU.

(BTW, I plan on THHN).

Question about option #2- the neutral & grounding bars on the main panel are only rated for up to a #4 CU. What do I do with my grounded & grounding wires if I use #3?

Yes, I've removed the bonding jumper from my sub. Will make sure that neutral bars get only grounded conductors, and grounding bars get only grounding counductors.

Thanks!

2017 / 2014 NEC & Related Books and Study Guides
Re: 100A sub redux #86717
11/24/03 05:41 PM
11/24/03 05:41 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Check the manufacturers catalog. Sometimes they make an auxilliary lug that will fasten into a couple of the neutral bus holes. I know that GE and Square D make these for their panels.

Tom


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