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Ground testing method and apparatus

  • US 20070103165A1
  • Filed: 11/10/2005
  • Published: 05/10/2007
  • Est. Priority Date: 11/10/2005
  • Status: Active Grant
First Claim
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1. A ground-current isolating circuit for providing a low voltage barrier between a service neutral conductor and an associated grounding system of an electrical utility service, comprising:

  • a first circuit arrangement to permit current in a first direction; and

    a second circuit arrangement to permit current in a second direction opposite said first direction, each of said first and second circuit arrangements having a positive pole and a negative pole, and a characteristic threshold voltage for biasing at least one unidirectional element in each circuit arrangement to a conductive state, and current in a forward biased direction being blocked by the at least one element for forward biased voltages less than or equal to the threshold voltage;

    wherein the first circuit arrangement positive pole is directly connected to the service neutral conductor and the first circuit arrangement negative pole is directly connected to the grounding system; and

    the second circuit arrangement positive pole is directly connected to the grounding system; and

    . the second circuit arrangement negative pole is directly connected to service neutral conductor.

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