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Ground-Fault Interrupter (GFI)
Last Updated on: Wednesday, April 23, 2008 08:30 PM
 
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G.F.C.I.:  A Ground Fault Circuit Interrupter (GFCI) is a device to protect against electric shock should someone come in contact with a live (Hot) wire and a path to ground which would result in a current through his/her body. The GFCI operates by sensing the difference between the currents in the Hot and Neutral conductors. Under normal conditions, these should be equal. However, if someone touches the Hot and a Ground such as a plumbing fixture or they are standing in water, these currents will not be equal as the path is to Ground a ground fault and not to the Neutral. This might occur if a short circuit developed inside an ungrounded appliance or if someone was working on a live circuit and accidentally touched a live wire. (added 02/05)

Ground Fault Interrupter #2:  National Semiconductor Application Note MP1851 June 1992 (app note added 02/05)

Ground Fault Interrupter:  Electronic circuit design (added 02/05)

Ground loops :  ASCII format (circuit design added 10/06)

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