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  1. Commercial Electrical Forum
    Long-time listener, first-time caller. Please be gentle I have a 200 amp, 240 volt, 3 phase auxiliary panel with 3 #3/0 copper ungrounded (hot) conductors and a #4 copper grounding (ground) wire to a non-insulated ground bar bonded to the panel. I would like to add some 120-volt circuits to...
    3 phase 3 to 4 wire
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