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Old 11-14-2005, 02:18 PM
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A GFI works by comparing the current on each leg, hot and neutral. When there's a ground fault, current in does not equal current out (some is flowing to ground) the device trips.

For a GFI to work when there's a problem, there needs to be a alternate path for current to flow to ground. This can be from a device with it's own ground, a stand alone ground probe, or the human body.
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