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A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage protection device, that interrupts an electrical circuit when the current passing through a conductor is not equal and opposite in both directions, therefore indicating leakage current to ground or ...
Such devices may be found in the form of either a circuit breaker, known as an earth-leakage circuit breaker (ELCB), or built into a socket (aka receptacle). Voltage-operated ELCBs can still be found in the wild, though these largely fell out of favour after the invention of the current-sensing based RCD (aka GFCI) technology.
A receptacle tester for North American wiring. An electrical outlet tester, receptacle tester, or socket tester is a small device containing a 3-prong power plug and three indicator lights, used for quickly detecting some types of incorrectly-wired electrical wall outlets or campsite supplies.
Plus the average GFCI receptacle costs about an hour's wages - or less. One GFCI receptacle can be used to protect a number of donwstream receptacles, if you're building a summer cottage or a doghouse or something and want to save $8 or so. And if you need to protect a permanently-wired apparatus, you can of course buy a GFCI circuit breaker.
As of the 2020 NEC this exception no longer exists and those devices in are required to have GFCI protection where otherwise required. Two-wire outlets having no grounding conductor may be protected by a GFCI or one upstream of the receptacle and must be labelled "No Equipment Ground" and "GFCI Protected". Most GFCI receptacles allow the ...
There are several alternatives for connecting newer appliances to two-prong receptacles without rewiring the building: removing the grounding pin of the plug (unsafe), replacing the receptacle with a three-prong outlet (unsafe without proper ground), or replacing the receptacle with a Ground Fault Circuit Interrupter (GFCI).