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    jpriest6523's Avatar
    jpriest6523 Posts: 1, Reputation: 1
    New Member

    Feb 4, 2007, 08:12 PM
    Running 100 amp service panal 200 ft away from main 200 amp service
    I am looking to find out how big the wire needs to be to carry the load. This will be a 100 amp service coming from a 200 amp main [ meter ] . It will need to travel 200 to 250 ft underground to a barn. If some one could help me that would be great thaxs)))
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member

    Feb 5, 2007, 02:49 AM
    Due to the length, economics, and the availability of typical materials, I would use #4/0 aluminum 4 wire URD cable. This is a cable with 4 wires that are twisted, can be direct buried. At each end you may need to terminate in a junction box to splice and change over to #2 wire because the #4/0 is too large to fit into 100 amp breakers.

    Bury the cable at least 24 inches, with 6 " sand above and below, use at least 2" PVC Sch 40 conduit to sleeve the cable if it runs under road ways, use warning tape 12 " below grade the entire length of the cable.

    Use 2" PVC Sch 40 at the riser at both ends to protect the cable.
    macj's Avatar
    macj Posts: 1, Reputation: 1
    New Member

    Apr 1, 2010, 02:27 PM

    What size copper do I need for 100 amp panel 130' away? & also what size ground?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member

    Apr 3, 2010, 03:20 AM
    Use 3 - # 2 copper with either THHN/THWN or XHHW insulation, along with a # 6 copper green for the equipment ground.

    If this is for a separate building, then there needs to be a ground rod grounding the equipment ground bar, keep the neutral separate and isolated from equipment ground.
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
    Ultra Member

    Jan 28, 2012, 10:50 PM
    macj... you MUST start your own thread or the answers here will be confusing to the OP or to you.

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