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

    Jul 22, 2007, 12:23 PM
    Ground Fault Interupters
    Why so GFIs require a separate neutral for each one?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jul 22, 2007, 12:43 PM
    A GFI measures the current flow in both the hot and the neutral. If it sees a 5 milliamp or more difference between the wires, it assumes a ground fault and shuts off.

    So both the hot and neutral of a circuit must run through a GFI device to achieve this comparison.

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