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Ground fault circuit interrupter

  • US 6,731,482 B2
  • Filed: 01/09/2001
  • Issued: 05/04/2004
  • Est. Priority Date: 01/09/2001
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a ground fault in a grounded load circuit having an internal floating ground and an external case ground, said load circuit powered through at least a pair of conductors, said method comprising the steps of:

  • establishing a maximum allowable ground fault current magnitude threshold;

    providing a first conductor between the floating ground in the load circuit and absolute ground;

    providing a second conductor between the case ground and absolute ground;

    detecting the aggregate of currents in said pair of conductors and said first conductor; and

    generating a ground fault signal indicative of a ground fault when said aggregate exceeds said current magnitude threshold.

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