John Dirks Jr Posted June 17, 2010 Report Share Posted June 17, 2010 If under normal conditions there is no current in the grounding system of a house, how does our 3 prong tester determine if the system is grounded or not? Quote Link to comment Share on other sites More sharing options...
Matt Fellman Posted June 17, 2010 Report Share Posted June 17, 2010 They just measure a voltage difference across the three possibilites and report if it exists. If there's no ground there's nothing to report... therfore the light is out. Hot - Neutral Hot - Ground Neutral - Ground Here's a cool link that has a lot of good info: http://www.thecircuitdetective.com/test.htm#general Quote Link to comment Share on other sites More sharing options...
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