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    amiteman's Avatar
    amiteman Posts: 7, Reputation: 1
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    #1

    Jul 14, 2007, 10:30 PM
    Cable size for 320 amp service , single phase
    I'm installing a 320 amp single phase service. What size cable do I need to use? I'll be using copper. Also what size for 200 amp?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jul 15, 2007, 03:52 AM
    Assuming this is a residential service, the 320 amp will be minimum #400 MCM Copper with either THHN/THWN or XHHW insulation, the 200 amp will be #2/0 with either of the same insulations.

    Assuming the 320 amp is the feeder to the meter, no equipment ground is needed. The grounding electrode conductor will be # 2 copper. The 200 amp is probably for the panelboards, and each feeder will need an equipment ground conductor of #6 copper. Be sure to separate, insulate and isolate the neutral from the equipment ground at each panel.
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