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GFCI (Ground Fault Circuit Interrupter)
The abbreviation for Ground Fault Circuit Interrupter, a device (usually built into receptacles) that detects ground faults, or current leaks, in electrical circuits. As soon a GFCI detects current leaking to the ground, it automatically interrupts power flow in order to prevent shock and electrocution from occurring. GFCIs must conform to UL 943 (Class A) requirements, and are mandatory in new construction buildings - in bathrooms, kitchens, basements, garages, and wherever else electricity and water will be in close proximity.