GFCI and AFCI in plain words
- A GFCI senses current leaking out, like through a person or water, and shuts off fast.
- An AFCI senses dangerous sparking in wires and cords and shuts off before a fire starts.
- GFCIs go near water: kitchens, baths, garages, outdoors and basements.
- AFCIs protect most living spaces: bedrooms, living rooms, hallways and more.
What each device does
GFCI stands for ground-fault circuit interrupter. It compares the current going out with the current coming back. If even a tiny amount goes missing, it may be flowing through a person. The GFCI cuts power in a fraction of a second.
AFCI stands for arc-fault circuit interrupter. It watches for the electrical pattern of sparking, like a nail through a wire, a crushed cord or a loose connection. It cuts power before the heat can start a fire.
Where GFCI protection is required
Under the 2023 National Electrical Code, which Utah adopted, homes need GFCI protection in places where water and electricity can meet:
- Kitchens
- Bathrooms
- Garages and accessory buildings
- Outdoors
- Basements and crawl spaces
- Laundry areas
- Near sinks, tubs and showers
In garages, the rule covers 125V to 250V receptacles, so a 240V outlet for an EV or welder needs GFCI protection too.
Where AFCI protection is required
AFCI protection covers most rooms where people live and sleep, including:
- Bedrooms
- Living rooms, family rooms and dens
- Dining rooms and kitchens
- Hallways and closets
- Laundry areas
AFCIs are usually breakers in your panel. Some rooms use dual-function breakers that give both GFCI and AFCI protection.
Do older homes need to add them?
Older homes are not required to add GFCIs and AFCIs everywhere just because the code changed. But when you remodel, replace outlets or extend a circuit, the new work must usually meet today's rules.
Even when not required, adding GFCIs in kitchens, baths and garages is one of the cheapest safety upgrades you can make. It's often done during Outlet and Switch Repair or an Electrical Safety Inspection.
How to test them, and why they trip
- Press TEST. The outlet or breaker should click off.
- Press RESET or flip the breaker back on.
- If it won't trip or won't reset, replace it.
UL recommends testing GFCIs once a month. A GFCI that trips often may be catching a real problem, like water in an outdoor box or a worn appliance. AFCIs can trip from damaged cords or loose connections.
One GFCI can protect other outlets downstream. If a bathroom outlet is dead, look for a tripped GFCI in another bathroom, the garage or outside. Still stuck? Book Electrical Troubleshooting.