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Ground detection circuit for a three wire power supply

  • US 5,726,900 A
  • Filed: 11/08/1995
  • Issued: 03/10/1998
  • Est. Priority Date: 02/02/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for monitoring a ground connection in a three wire power supply circuit which selectively connects and disconnects a load from an alternating current power source having line, neutral and ground conductors, said ground connection monitoring apparatus comprising:

  • generating means for generating an output signal;

    control means connected between said line conductor and said ground conductor and connected to said generating means, said control means being configured to operate said generating means to generate said output signal when current flows between said line conductor and said ground conductor and to interrupt operation of said generating means when current does not flow between said line conductor and said ground conductor; and

    indicating means connected to at least one of said control means and said generating means and operable in response to said output signal to indicate at least one of the presence and the absence of current flow in said ground conductor.

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