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

    Feb 22, 2007, 02:55 PM
    Secondary 100 Amp Feeder Wire Size
    Hello to all. I am running a feeder wire in 2" conduit from my 100 amp breaker in my house panel to my 100 amp garage panel approximately 160' away. I am wondering if #1-#1-#2 Aluminum is sufficient with a #6 Copper ground. Thanks for the help.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Feb 22, 2007, 03:30 PM
    The voltage drop will be 6.5 volts across each 120 leg to neutral assuming the load is 80 amps.

    Recommended maximum allowance is 3% or 3.6 volts. If the load does not exceed 40 amps, the voltage drop will be 3.2 volts, which will be acceptable.

    If there will be large motors, say 5- 10 HP, they may have a problem starting due to the locked rotor amperage combined with any other running load.
    jeff bouchey's Avatar
    jeff bouchey Posts: 7, Reputation: 1
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    #3

    Feb 22, 2007, 04:50 PM
    Quote Originally Posted by tdcalahan
    Hello to all. I am running a feeder wire in 2" conduit from my 100 amp breaker in my house panel to my 100 amp garage panel approximately 160' away. I am wondering if #1-#1-#2 Aluminum is sufficiant with a #6 Copper ground. Thanks for the help.
    Yes # 2 Al or #3 Cu is sufficient. #6 Cu ground is also sufficient. Just remember to remove the bonding screw in the panel in the garage. I suggest burying a ground plate approx. 2' in the ground and tying it to the panel itself
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Feb 22, 2007, 05:12 PM
    Do not connect the new panel to a grounding electrode as suggested.
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