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    stewwwiee's Avatar
    stewwwiee Posts: 1, Reputation: 1
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    #1

    Sep 25, 2007, 07:39 AM
    Weird receptacle tester readings
    When using a standard 120V receptacle tester on all receptacles fed from a 600V/120V transformer all three lights appear. There is no indication of what this means. When tested with a multimeter all readings are proper. Receptacle tester is working properly when pluged into plugs from other sources.


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    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Sep 25, 2007, 08:33 AM
    Sounds like the transformer may be a WYE or grounded Delta to create a neutral return for 120 volt, and that the neutral is not grounded to a grounding electrode, which can be building steel..

    Can you provide more detail on the wiring of the transformer, make and model, and perhaps some pictures?
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