GFCI (Ground Fault Circuit Interrupter)
The outlet with TEST and RESET buttons. It compares current going out and coming back, and trips in milliseconds when even 5 milliamps leak elsewhere, like through a person.
A GFCI is shock protection, full stop. A normal breaker trips at 15+ amps, thousands of times the current that can stop a heart; a GFCI trips at 0.005 amps in a fraction of a heartbeat. That is why code requires them everywhere water lives: bathrooms, kitchens, garages, outdoors, basements, laundry. One GFCI also protects every ordinary outlet wired downstream of it, which is why a dead bathroom outlet so often resurrects at a RESET button in another room or the garage.
GFCIs are also the code-recognized fix for old ungrounded circuits: a GFCI cannot create a missing ground, but it covers the shock risk, with a "No Equipment Ground" label. They wear out, typically after 10 – 15 years; a unit that will not reset with nothing plugged in, or that no longer trips on TEST, has reached the end.
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- Receptacle (Outlet) : The device you plug into.
- NEMA 14-50 : The heavy 240-volt, 50-amp receptacle used for ranges, RV hookups and plug-in EV charging: four slots, rated for the most power a standard residential outlet delivers.
- Dedicated Circuit : A circuit serving exactly one appliance, with its own breaker and nothing else sharing the wire.
- Three-Way Switch : A switch pair controlling one light from two locations, like both ends of a hallway or stairs.