Ground rod to exterior subpanel

Discussion in 'Electrical' started by zimmy1948, Jun 21, 2018.

  1. zimmy1948


    Jun 21, 2018
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    I am running a subpanel outside and wondering if a ground rod in addition the ground to my interior panel is necessary.
    Is it a good idea? All my interior wiring passes inspection.
    zimmy1948, Jun 21, 2018
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  2. zimmy1948

    Don Farrell

    Jun 3, 2018
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    If the secondary panelboard is not in the same building as the original panelboard, you must run a four wire cable or four conductors to supply the secondary panelboard. Also, you must have a separate grounding system (one or two ground rods) at the secondary site. You Cannot connect the ground from the main panelboard to the ground at the secondary panelboard.

    Contrary to popular thought, the grounding system is to protect against high voltage spikes and lightening, not to ground the equipment to earth.
    Don Farrell, Jun 25, 2018
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