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

    Aug 4, 2010, 06:52 AM
    Underground wiring depth
    How "deep" should the underground electrical wire be for an ordinary lamp post 50 feet from the house? Is it necessary to go down below the freezing point like fence posts?
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Aug 4, 2010, 07:14 AM

    In a residence 18" is all that is required.
    This can be reduced to 12" if the circuit is GFI protected before it goes underground.
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