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    UsaveU's Avatar
    UsaveU Posts: 25, Reputation: 1
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    #1

    Mar 6, 2012, 01:08 PM
    When did US Electrical Code Start Inforcing System Grounding
    When was system grounding code enforced in the US. This is just for my personal curiosity.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Mar 6, 2012, 01:17 PM
    Do you mean the grounding electrode system?
    Or equipment grounding for branch circuits?
    UsaveU's Avatar
    UsaveU Posts: 25, Reputation: 1
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    #3

    Mar 6, 2012, 01:19 PM
    Im talking about when the electrical wire went from having just neutral and hot wires to having both of those plus a ground.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Mar 6, 2012, 01:52 PM
    In 1971 the National Electrical Code required 3 prong outlets in all locations of the home, so that's when wiring of 3 conductors (or two conductors plus conduit for ground) became common. The refererence to the 1971 code is here: http://en.wikipedia.org/wiki/Cheater_plug
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #5

    Mar 7, 2012, 08:49 AM
    If I recall correctly, the 3 wire system that allowed the neutral and equipment ground to be one conductor, for appliance branch circuits and panels, was removed in the 2005 edition of the NEC.

    Please explain why your asking.
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