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Ground Fault Circuit Interrupter(GFCI). Sometimes known as a GFI, or a residual-current device (RCD or RCCB). Can refer to receptacles as well as circuit breakers. They detect a leak in current, or an imbalance between the current on the hot and neutral wires. This is used to prevent electrical shock. Use with the [electrical] tag

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How do I replace 4 GFCI receptacles on the same circuit?

The first GFCI has not worked in years. Today a hair dryer quit, and the remaining 3 GFCIs are not working. Replaced the first one and it seemed to be working properly. … The old GFCI did not pop, but power was lost to all the GFCIs. We can't get power to the units even though we have power to the first unit. All but the last have 5 wires, including ground. …
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