Ground Fault Circuit Interrupter Fundamentals. What A GFCI Is, and How It Works. One of the frequent problems our customers encounter is with a Ground Fault Circuit Interrupter - or GFCI - circuit which has either stopped working, won't reset, or tripped itself without their knowledge. Beginning in 1971, the NEC (National Electric Code) started implementing these protective devices. While initially required on construction job sites and in bathrooms ...
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