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Clamp Meter -- No Contact on Dual/Three Wire AC Current Measurement????

Discussion in 'Electronic Basics' started by NYC Doc, Aug 16, 2005.

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  1. NYC Doc

    NYC Doc Guest

    Can clamp meters determine AC current on conventional extensions cords that
    have two conductors and a ground?

    thanks in advance
  2. JeffM

    JeffM Guest

    Can clamp meters determine AC current on conventional extensions cords
    No. Only 1 conductor can be in the clamp.
  3. mike

    mike Guest

    Simplest thing is to unplug the cord and insert a current tap and
    clamp the probe around that.

    There is some technology using field measurements for power lines.
    I've seen an article on a handheld instrument that can measure
    the current in zip cord. Claimed 10% accuracy. Does some kind of field
    measruement that can
    distinguish between the different distances of the wire from the sensor.
    Not sure if the third ground wire messes that up. Twist probably
    doesn't help either.
    The meter was so far out of my price range that it seems that I didn't
    save the reference to the article.

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  4. Don Taylor

    Don Taylor Guest

    Sure, carefully split a few inches of the cord so that you don't expose
    bare copper but do separate each of the two conductors and ground
    and clamp the meter around one of the non-ground conductors.
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