GFCI and AFCI: where code requires them and what they do

What the two devices catch

A GFCI (ground-fault circuit interrupter) watches current going out and coming back on a circuit. If a small amount, about 5 milliamps, goes somewhere else, such as through a person to ground, it shuts the circuit off in a fraction of a second. It is about preventing shock and electrocution.

An AFCI (arc-fault circuit interrupter) listens for the pattern of an electrical arc, such as a pinched cord or a loose wire spitting sparks inside a wall. It cuts the power before the arc starts a fire. It does not protect people from shock.

They do different jobs, and a room that needs both needs both. If a protective device trips often, treat it as a report of a real fault. See breaker keeps tripping if a breaker is doing the tripping.

Safety note

Press TEST on every GFCI outlet monthly. A GFCI that no longer trips still gives power, so you will not know it has failed. If a GFCI or AFCI is warm, buzzing or smells, shut off the breaker and read hot or burning-smell outlets. Never bypass either device with a regular outlet to stop tripping.

Where GFCI protection is required (NEC 210.8)

California’s 2025 Electrical Code is based on the 2023 NEC and took effect January 1, 2026. For dwelling units, section 210.8(A) lists locations where receptacles need GFCI protection. As of October 2026 these include:

• Bathrooms
• Kitchens: under the 2023 NEC, all 125 to 250 volt receptacles, not only countertop outlets
• Laundry areas
• Garages and accessory buildings that are not habitable rooms
• Outdoors
• Crawl spaces at or below grade
• Basements, finished or not (a 2023 NEC change)
• Any outlet within 6 feet of a sink, tub or shower
• Indoor damp or wet locations
• Boathouses

210.8(D) requires GFCI protection for dishwasher circuits. The 2023 NEC also extended the voltage range to 250 volts, so 240-volt outlets in these places, such as a range receptacle in a kitchen, need protection too. Listed appliances such as dishwashers, dryers, ranges and sump pumps are covered by 210.8(D) in the 2023 edition. Section 210.8(F) covers outdoor outlets that supply HVAC equipment.

A GFCI outlet protects itself and any outlets wired after it (“downstream”). A GFCI breaker in the panel protects the whole circuit. Both meet the code. A breaker is simpler when a circuit has many outlets or the outlets are hard to reach.

Where AFCI protection is required (NEC 210.12)

Section 210.12 requires AFCI protection on 120-volt, single-phase, 15- and 20-amp branch circuits supplying outlets or devices in most living spaces of a dwelling:

• Bedrooms, living rooms, family rooms and dining rooms
• Kitchens and laundry areas
• Hallways and closets
• Dens, libraries, sunrooms and recreation rooms

Bathrooms, garages and outdoor circuits are not on that list for AFCI. Under 210.12(D), modifying or extending an existing branch circuit in these areas generally triggers AFCI protection, with a small exception for extending a circuit by 6 feet or less without adding outlets. Replacing a receptacle in an AFCI area can also trigger it under the 2023 NEC. Local rules vary, so confirm with the building department.

Types of AFCI protection include the combination AFCI breaker, which covers the whole circuit, and outlet branch-circuit devices. The breaker is the usual choice.

A kitchen or laundry needs both

Kitchens and laundry areas fall under both rules. A dual-function AFCI/GFCI breaker covers both in one device. Another approach is an AFCI breaker plus GFCI outlets. Each works. Ask the electrician which fits your panel, since breakers must match the panel brand and type. The panel upgrades page explains when the panel is too old or full to take new breakers.

Older homes

A home built before the 1990s may have no GFCI outlets in some places the code now covers, and no AFCI at all. Code does not force you to upgrade the whole house unless you do work that triggers it, such as a remodel or a new circuit. Many homeowners add GFCI outlets in bathrooms, garages and outdoors anyway, since the cost is low. Homes with two-prong outlets and no ground can use a GFCI outlet labeled “No Equipment Ground” as a safer replacement. The California electrical code changes guide covers what the new edition changed.

What it costs

As of October 2026, Fixr’s national guide lists $120 to $200 to install an outlet and up to $275 for a 15-amp GFCI outlet. A new dedicated circuit costs more and is quoted by the run. AFCI and dual-function breakers cost more than GFCI outlets because the device itself is pricier. The outlet and GFCI cost page breaks down the range. Prices shift with panel brand and access.

For a dead outlet that may be a tripped GFCI, see outlet not working.