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

    May 3, 2009, 04:56 PM
    GFCI circiutry constantly checks for a difference in current between
    GFCI circiutry constantly checks for a difference in current between what?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    May 3, 2009, 05:37 PM

    Current flowing through the "line" or power wire to the load(s), and current flowing "back" from the load(s) through the "neutral" wire.
    DanielF's Avatar
    DanielF Posts: 158, Reputation: 14
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    #3

    May 3, 2009, 11:27 PM
    This link provides a more detailed explanation:
    What is a GFI/GFCI?

    Daniel
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #4

    May 4, 2009, 08:40 AM

    The GFCI does detect the current difference between line and neutral. It does this with a current transformer where the line and load wires are wound in opposite directions. Therefore the subtraction is done in the current transformer.

    It also detects a grounded neutral. This is does by modulating he hot and the neutral currents with opposite polarity. This would normally cancel. It cannot modulate a neutral connected to ground after the GFCI, so it detects the presence of the modulation.

    240 v GFCI's are a bit different. You have 3 wires to contend with L1, L2 and N,
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