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Daltex 09-17-2012 08:17 PM

Multi Sub Panels
 
While redoing our kitchen (1950's house) I ran a lot of new branch circuits and added a few more sub panels. The electrical is a mess (other then what I re-did) due to bonding issues and grounding issues. I need some advice.

Main panel: 200 amp panel (pass through panel) that does supply 2 branch circuit takeoffs for sub panels (these are small branches not connected to the main structure and not an issue yet). There is 3/0, 3/0, 3/0 THHN coming off the pass through lugs. Guess the conduit was supposed to be the ground.

Conduit carrying 3x 3/0 runs on exterior to huge J box where a splice is that leads to the first interior panel- 200 amp sub with neutrals and grounds co mingled. No continuation of conduit to this panel so just 3 x 3/0 copper here.

External conduit continues from splice point to 2nd exterior J box where it is spliced with jacketed 3/0 copper without a ground and this runs up into attic and down a wall into the walk in pantry with the 2nd 200 amp panel that I re-did.

A licensed electrician told me that he considers it as 2 main panels so I should bond the grounds to neutrals at both. I feel from my research that the pass through panel should be the main panel and the 2 sub panels need a ground run to each.

I'm thinking about running the 3/0 x 3 with #6 ground to first panel, splicing it with splice lugs to continue to the 2nd panel. If necessary I can reduce size of neutral to 2/0 or 1/0 if the existing 3/0 won't make home runs and I have to purchase new copper.

I'm in an unincorporated area without any inspectors and really would like some input. I'll probably use an electrician as pulling these won't be a one man job but I know I'll need to be informed as much as possible to avoid putting it into yet another dangerous situation.

Thanks !!

Joconfire 09-17-2012 08:46 PM

The main panel (as you call it) is on the outside of the house?

It doesn't sound like there is a disconnect in it. The neutral/ground bond is always at the first means of disconnect.

Techy 09-17-2012 09:10 PM

Quote:

Originally Posted by Daltex (Post 1011965)
No continuation of conduit to this panel so just 3 x 3/0 copper here.



is this flying THHN/THWN or a SE type cable assembly


Pictures if possible would be a large help

Daltex 09-18-2012 11:34 AM

Quote:

Originally Posted by Joconfire (Post 1011986)
The main panel (as you call it) is on the outside of the house?

It doesn't sound like there is a disconnect in it. The neutral/ground bond is always at the first means of disconnect.

Yes the main panel is outside the house. It has a disconnect (200 amp breaker).

I agree with you regarding "The neutral/ground bond is always at the first means of disconnect" and that is why I redid the panel I used for the kitchen remodel and also subs past that. I did have to bond grounds to neutrals in the sub panel because there is no seperate ground run but I did put neutrals on one buss bar and grounds on seperate. Once a ground is run I can seperate the 2 via removal of the bonding bracket.

Quote:

Originally Posted by Techy (Post 1012000)
is this flying THHN/THWN or a SE type cable assembly
Pictures if possible would be a large help

I think it could be some type of SE cable going to the first sub panel. It has 2 conductors wrapped by a copper mesh with pvc coating. Kinda like a coax cable.

I'll see if I can get some pics to post. Won't be there until this coming weekend though.


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