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    c5feverny's Avatar
    c5feverny Posts: 1, Reputation: 1
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    #1

    Jan 3, 2008, 03:28 PM
    200 A Main panel to 100 A sub panel
    I'm planning to upgrade my existing 100 A 20 slot main panel to a 200 A 40/40 panel with a new 200 A service. Is it possible to install the 200 A panel next to the 100 A panel and feed the 100 A panel from the new 200 A panel. I was considering doing this to avoid having to redo and possibly extend the existing wiring already in the 100 A panel.
    This would also allow me to run the new service cable, meter box, and panel without having to shut power off to the house. Then after it is all inspected I can have the power company disconnect the old service and connect the new service after the two panels were connected together.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jan 3, 2008, 04:53 PM
    Yes, no problem. Just need to be sure to run a insulated neutral to the insulated neutral bar, do not bond to the metal can, and run an #8 equipment ground, can be bare or green, to a separate equipment ground bar in the 100 amp panel.

    Excellent idea, working on new keeping the old in use. Does not happen too often. That is done whenever possible.
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