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Severna Park, Maryland Posts: 3458
Joined: May, 2007
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Portland, OR Posts: 22
Joined: Apr, 2010
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receptacle tester
[#2] Posted: 06/16/2010 - 9:01:10 PM |  | |
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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...#general
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