Forum Discussion
CA_Traveler
Jul 13, 2016Explorer III
Harvard wrote:GFCIs detect current differences not voltage differences. If the difference between the hot and neutral currents is greater than 5ma (0.005A) it trips.
I do have one follow up question concerning leakage current from neutral to ground. How does this leakage amount to anything if there is very little (or no voltage) between neutral and ground. That is when compared to the magnitude of leakage from the 120 VAC Hot to Ground.
The leakage current may be returning to the main service panel via the ground wire or via someone standing in water and returning via earth ground.
BTW For a good device and circuit with a load there could be several volts difference between the neutral and ground wires at the device. This is due to the load on the neutral wire while the ground is a safety wire and normally will not have any load.
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