GFCI and AFCI Requirements (NEC 210.8 + 210.12 Made Simple)

GFCI: where it's required (NEC 210.8(A) for dwellings)

All 125V-250V receptacles in these locations must be GFCI-protected in dwelling units:

• Bathrooms
• Garages and accessory buildings
• Outdoors
• Crawl spaces (at or below grade level)
• Unfinished portions of basements
• Kitchens (countertop and within 6 ft of any sink)
• Sinks (within 6 ft)
• Boathouses, bathtubs, shower stalls
• Laundry areas
• Indoor damp/wet locations
• Dishwashers (NEC 2020+)

Note: the NEC 2023 update raised the voltage threshold and added specific equipment categories. Read 210.8(A) directly for the full current list.

GFCI: 210.8(B) for non-dwelling occupancies

Commercial/industrial GFCI requirements apply to:

• Bathrooms and rooftops
• Kitchens
• Indoor damp/wet locations
• Locker rooms with showers
• Garages, service bays, and similar areas
• Outdoor receptacles
• Unfinished basements and crawl spaces
• Within 6 ft of sinks

AFCI: where it's required (NEC 210.12)

AFCI protection is required for 120V, single-phase, 15A and 20A branch circuits supplying outlets in these dwelling unit areas:

• Kitchens
• Family rooms
• Dining rooms
• Living rooms
• Parlors
• Libraries
• Dens
• Bedrooms
• Sunrooms
• Recreation rooms
• Closets
• Hallways
• Laundry areas
• Similar rooms

Essentially: if it’s an indoor habitable space in a dwelling, the 120V branch circuit needs AFCI. The exception list (bathrooms, garages, outdoors) is also where GFCI lives, and those areas need GFCI but not AFCI.

Where you need both

Kitchens and laundry areas in dwelling units need both GFCI and AFCI per NEC 2020+. A dual-function GFCI/AFCI breaker covers both at the panel; a downstream GFCI receptacle can handle the GFCI piece if the circuit is AFCI-protected at the breaker.

How the exam tests this

Pattern 1: List a location, ask GFCI / AFCI / both

"A 20A branch circuit supplies receptacles in the bedroom of a single-family dwelling. What protection is required?" Answer: AFCI. Bedrooms need AFCI but not GFCI.

Pattern 2: Voltage / amperage thresholds

AFCI applies to 120V, 15A and 20A branch circuits. Three-phase circuits don’t need AFCI per 210.12.

Pattern 3: Replacement receptacles

406.4(D) requires replacement receptacles in any GFCI-required location to be GFCI when replaced. Same for AFCI in AFCI-required locations. This is a frequent code update question.