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Thread: egc/gec 50kw satcon subpanel interconnect

  1. #1
    Join Date
    Jun 2012
    oakland, ca

    egc/gec 50kw satcon subpanel interconnect

    i am connecting a rooftop mounted 50kw satcon inverter to a nearby 400A 480V subpanel with an 80A breaker. the grounding between the subpanel on the roof and the main panel two floors below is #2. the gec for the main panel is #4/0. the largest dc conductor is #3/0. do i really need to run #3/0 all the way downstairs two floors to the AC grounding electrode?

  2. #2
    Join Date
    May 2011
    Yes, you do, unfortunately.

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