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3 way switch voltage ?

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  • 3 way switch voltage ?

    I have followed the diagrams posted on this site for a 3 way. My question is when I am checking the wires at the light in on position my white to green is 0 A/C black to white is 120 a/c and black to green is 120 a/c.
    In off position white to green is 0 a/c black to white is 67 a/c and black to green is 67 a/c.
    Should I be concerned about the 67ac in the off position?

  • #2
    I bet you're using a digital voltmeter. What you're reading are phantom voltages http://www.nema.org/engineering/papers/PhanBull88.html

    Try using an anolog meter and see what you read.

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    • #3
      [8D]After tracing everything back to the panel by jumping junction box to light and so on to check and see that I did not acidentally shave a wire through the wire casing I see how it is possible to have a phantom voltage problem.
      I was using a true rms digital meter and thankfully conclude that this was the problem.
      This forum is the best. Thanks for the valable information.

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      • #4
        No problem, one less thing to worry about [8D]

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