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I am putting in a new one hundred amp load center. I have a present on/off main panel mounted next to the new load center. My question: Is the new load center now considered to be a sub panel? If it is considered a sub panel, then will the neutral need to be isolated with a separate ground bus?

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    Is the neutral wire bonded anywhere in the on/off main panel, or does it just pass through?
    – Edwin
    Commented Feb 20, 2015 at 20:01
  • @ChiefTwoPencils - Looks like an answer.
    – TomG
    Commented Feb 21, 2015 at 0:23
  • @ChiefTwoPencils -- make that an answer and I'll upvote Commented Feb 21, 2015 at 4:18

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If the on/off panel was done correctly, and it probably was, it has a main bonding jumper installed. I can't see any reason why you'd want to change that. So, yes; it's a sub-panel and the gounded/ing conductors should not be bonded together in the new one. If you want to verify it you'll have to remove the cover on the present panel.

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