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

    Oct 2, 2007, 06:58 AM
    Additional 100 amp service
    I just finished a 24' X 30' pole building and want to install a 100 amp panel. The main panel in the house is 200 amp service about 130 feet away. What size / type copper wire should I use and what size underground conduit should I use? How deep should the conduit be buried. Thanks PTC
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Oct 3, 2007, 12:02 PM
    #2 THHN/THWN or XHHW Copper, or #1 XHHW aluminum will produce just under 2 % voltage drop for a fully loaded to 80% for a 100 amp feeder.

    In either case I would use no smaller than 2" PVC, due to the length, and allow for expansion.

    If this is residential, 18 deep, otherwise 24 " deep.

    Be sure to have a #6 equipment grounding conductor, and keep the neutral insulated at the subpanel.
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