Electrical Safety & Emergencies

GFCI vs AFCI Protection: Where Code Requires Each

GFCIs protect people from shock. AFCIs protect buildings from fire. Code requires both in more places with every edition.

Updated 2026-10-15

GFCI: ground-fault protection

A GFCI compares current on hot and neutral and trips in a fraction of a second if a few milliamps leak — the kind of leak that could pass through a person. NEC 210.8 requires GFCI protection in dwelling bathrooms, garages, outdoors, crawl spaces, unfinished basements, kitchens, laundry areas, and within 6 feet of sinks, with the list expanding in recent editions.

AFCI: arc-fault protection

AFCIs detect the signature of arcing from damaged cords, loose connections, or nails through cables. NEC 210.12 requires them on most 120V branch circuits feeding living areas — bedrooms, living and family rooms, dining rooms, kitchens, hallways, closets, and laundry areas — in new construction, and when existing circuits are extended or modified.

Dual-function and retrofits

Practical options:

Dual-function AFCI/GFCI breakers protect a whole circuit from the panel
GFCI receptacles protect downstream outlets on the same circuit
Outlet-branch-circuit AFCI receptacles work where panel breakers aren't available

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Frequently asked questions

Do I have to upgrade my older home to current GFCI/AFCI rules?

Generally no, unless you're modifying those circuits or your jurisdiction has a point-of-sale requirement. Adding GFCI protection in wet areas is still one of the best low-cost safety upgrades.

Why does my GFCI keep tripping?

Moisture in outdoor boxes, failing appliances, or long cable runs with leakage. Test the GFCI monthly; if it trips constantly, have it checked.

Can a GFCI protect a two-prong outlet?

Yes. Code allows replacing ungrounded two-prong receptacles with GFCI-protected three-prong receptacles labeled 'No Equipment Ground.'

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This guide is general information, not engineering or legal advice. Electrical codes are adopted and amended locally — consult a licensed electrician and your local building department for your project.