Ground-fault circuit interrupter protection is required by the National Electrical Code® for receptacles in areas where a water source is present. This includes all wet or damp locations.
GFCI protection is required for 15-amp and 20-amp, 125-volt receptacles in:
GFCI protection is required in single-phase receptacles rated 50 amps or less, not exceeding 150 volts to ground, and 3-phase receptacles rated 100 amps or less, not exceeding 150 volts to ground.
The National Electric Code drives your business operations. It is our safety guide to electrical product and component installation and maintenance. Regular revisions, including those for ground-fault circuit interrupters, are necessary to keep up with our industry’s demands.
Ground-fault circuit interrupters, GFCIs or GFIs, are safety devices built into outlets that protect against electrical shock. Their circuitry monitors electrical input. When a ground fault occurs, the GFCI quickly—in a fraction of a second—shuts off the power.
GFCI outlets protect all outlets on the same circuit, as well as connected tools and appliances.
The latest UL Standards require GFCIs to be self-testing. This requirement began in 2015.
There is no difference between GFCI and GFI protection. Ground-fault circuit interrupters are commonly referred to as ground-fault interrupters.
Arc-fault circuit interrupters are different. AFCIs protect against fires caused by arcing faults that come from faulty or damaged wiring.
GFCIs are different than circuit breakers in that they are more sensitive. On their own, circuit breakers only protect against overloads and resulting fires. GFCIs, however, protect against electrical currents that are too low to trip breakers but are more than enough to cause injury. Having both GFCI and circuit breakers helps safeguard against electrical shock and fires.