dnarich
I am installing a Generac ATS (100 amp sub-panel) for a 10 KW Generac generator. I am not able to place the ATS immediately adjacent to the main panel (but rather about 10 feet away).

In this situation, I am unable to extend my existing branch circuits (which land in the main panel now) to the ATS, unless I splice them all (12 circuits).

The easiest would be to splice all the hots and run them in a conduit to the ATS sub along with a #6 neutral and #6 ground, but it looks to me as though unless I run the neutrals all over to the ATS sub panel as separate lines for each branch circuit, this technically would violate the code which I understand to require that neutrals and hots all terminate in the same box.

Even though running a larger neutral between the ATS sub-panel and the main panel would be electrically sound, my interpretation of NEC is that I cannot legally do so. Is that correct, or do people do that?

Also, if I have to splice all of the branch circuits and run over on separate lines, do I just set up a separate "splice box" above my main panel and bring all of the branch circuits into the splice box, and then run all of the lines from there out to the ATS sub-panel (either as THHN in conduit or as individual Romex cables)?

Thanks for the help. Great forum!
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ceb58
dnarich;9693 wrote:
I am installing a Generac ATS (100 amp sub-panel) for a 10 KW Generac generator. I am not able to place the ATS immediately adjacent to the main panel (but rather about 10 feet away).

In this situation, I am unable to extend my existing branch circuits (which land in the main panel now) to the ATS, unless I splice them all (12 circuits).

The easiest would be to splice all the hots and run them in a conduit to the ATS sub along with a #6 neutral and #6 ground, but it looks to me as though unless I run the neutrals all over to the ATS sub panel as separate lines for each branch circuit, this technically would violate the code which I understand to require that neutrals and hots all terminate in the same box.

Even though running a larger neutral between the ATS sub-panel and the main panel would be electrically sound, my interpretation of NEC is that I cannot legally do so. Is that correct, or do people do that?

Also, if I have to splice all of the branch circuits and run over on separate lines, do I just set up a separate "splice box" above my main panel and bring all of the branch circuits into the splice box, and then run all of the lines from there out to the ATS sub-panel (either as THHN in conduit or as individual Romex cables)?

Thanks for the help. Great forum!


Well their are those that will tell you to just run a #6 and be done with it or its the way they have all ways done it and the inspector never said any thing.

It is a code violation to do it that way. 300.3 (B)2008

There shouldn't be a need for a splice box above the main panel unless the panel is a complete rats nest. Splice inside the main panel and run to the ATS.
Unless you have the benders and other tools needed for conduit running NM-B (Romex) would be the simplest.
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