· by Michael Blair, Nashville's Electrician
GFCI protects people from shock; AFCI protects the house from fire. Requirements for both have expanded steadily, and a house built to 1995 code is legal but far less protected than one built today. What matters is what triggers an upgrade obligation.
Where GFCI belongs
Anywhere water and electricity can meet: bathrooms, kitchen countertop receptacles, garages, unfinished basements, crawl spaces, outdoors, laundry areas, and near sinks generally.
Recent code cycles have extended it to more appliance circuits, which is why a new dishwasher or a replacement HVAC disconnect can bring a GFCI requirement with it.
Where AFCI belongs
Broadly the living areas: bedrooms, living rooms, dining rooms, hallways, closets and similar. The intent is arcing in concealed wiring, which is the fire risk in older cable.
AFCI is more prone to nuisance tripping with some motor loads and older wiring, which is a real annoyance but not a reason to remove it.
- GFCI: bathrooms, kitchen counters, garage, basement, crawl, outdoors, laundry
- AFCI: bedrooms, living areas, hallways, closets
- Dual-function breakers cover both on one circuit
- Protection can be at the breaker or at the first receptacle
What triggers the requirement
Existing wiring is generally allowed to remain as installed. Requirements attach when you alter, extend or replace a circuit — adding a receptacle to a bedroom circuit typically brings AFCI with it.
Replacing a receptacle in a location that now requires GFCI generally requires GFCI protection, even though it is a like-for-like swap. That catches homeowners out on simple jobs.
Doing it without a rewire
A GFCI receptacle in the first position protects everything downstream on that circuit, which means one device can cover several outlets. It works on ungrounded circuits too, with labeling.
AFCI generally goes at the breaker, so it needs a panel that accepts a compatible breaker. On a very old panel that may not exist, which is one of the more legitimate arguments for a panel replacement.