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GFCI Electrical Specifications

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  • GFCI Electrical Specifications

    I wonder if anyone here can answer this - does the NEC specify the operating parameters of a GFCI. For example what amount of ground fault current should cause the GFCI to trip, how quickly should it trip etc.

    This is actually a work related question - I'm developing a product that requires a GFCI as part of the product.

  • #2
    Re: GFCI Electrical Specifications

    Blue, not too sure about the NEC specifics, but I am sure that the fault current for injury protection is in milli amps.Seems like 5 ma to 30 ma.



    • #3
      Re: GFCI Electrical Specifications

      the NFPA, who authors the NEC, is the body you are looking for I think.

      4 to 6 mA is the trip point for a GFCI. There are testers that you plug in to the outlet and can ramp up the leakage current in 1 mA increments to verify the trip point. /between 4 & 6 mA pases, outside the range fails. The Hubbell Model: GFT2G (~$250.00) or the Greenlee Model: 5708 (~$200) are two that I can think of right off.

      There are also cheaper testers with a push button that will trip the GFI, but you'll have no indication as to when, and they are not accepted by OSHA as an appropriate test of a GFIs operability under 29CFR1910 or 1926.
      "When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
      John Ruskin (1819 - 1900)