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Wiring device having leakage detection function

  • US 8,390,967 B2
  • Filed: 07/02/2009
  • Issued: 03/05/2013
  • Est. Priority Date: 07/02/2008
  • Status: Active Grant
First Claim
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1. A wiring device which has leakage detection functions and is located between a commercial power supply and a load, comprising;

  • a leakage controller that detects a leakage current flowing through an electrical path connecting the commercial power supply and a load to perform a leakage determination; and

    a switch that interrupts the electrical path in accordance with the leakage determination of the leakage controller,wherein the leakage controller further comprises;

    a filter that removes high frequency components of the detected leakage current, the filter having a current-frequency characteristic corresponding to current waveforms that a human body perceives as aim electrical shock;

    a square operator that calculates a square value of a signal passing through the filter; and

    a determiner that performs the leakage determination by comparing the square value obtained by the square operator to preset threshold value.

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