×

Improvements relating to the testing of an earth connection

  • US 8,476,913 B2
  • Filed: 05/19/2008
  • Issued: 07/02/2013
  • Est. Priority Date: 05/17/2007
  • Status: Active Grant
First Claim
Patent Images

1. A device for testing an earth connection that is isolated from a mains electricity supply, the device comprising means for electrically connecting the device to the earth connection, means for electrically connecting the device to an electrically conductive item having a capacitance relative to an adjacent surface of the earth that is within a pre-determined range of capacitances, means for generating an AC signal and delivering the AC signal to the electrically conductive item, frequency determination means for determining whether a frequency of the generated AC signal falls within a predetermined range of frequencies, and means for determining whether a resistance between the earth connection and an earth reference potential is less than a maximum earth resistance value from an output of said frequency determination means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×