Homeowners who see "GFCI" or "AFCI" on a breaker, outlet, or a home inspection report often are not told what these actually protect against, only that something needs to be added or replaced. Both are safety devices, but they protect against different hazards, and knowing the difference helps make sense of what an inspector or electrician is actually recommending.
What a GFCI does
A ground-fault circuit interrupter monitors the current flowing through a circuit and shuts the power off almost instantly if it detects current leaking somewhere it should not, typically through water or through a person. GFCI protection is about preventing electric shock, particularly in wet or damp locations where the risk of that leakage path forming is highest.
Where GFCI protection is typically required
Locations where water and electricity are more likely to come into contact are the standard targets for GFCI protection: bathrooms, kitchens near counters and sinks, outdoor outlets, garages, unfinished basements, and areas near pools or hot tubs. The Canadian Electrical Code sets out specific requirements for where GFCI protection applies, and these requirements have expanded over past code cycles, so a home wired to an older code edition may have fewer GFCI-protected locations than a home built or renovated more recently.
What an AFCI does
An arc-fault circuit interrupter monitors for the electrical signature of arcing, a small, often intermittent electrical discharge that can occur from damaged wiring, a loose connection, or a pinched cord, and shuts the circuit down before that arcing has a chance to ignite nearby material. AFCI protection is about preventing electrical fires that start inside walls or behind furniture, where nobody would see a problem developing until it is already a fire.
Where AFCI protection is typically required
AFCI protection has generally been required for bedroom circuits under the Canadian Electrical Code, with some code cycles expanding the requirement to additional living space circuits. As with GFCI, the exact scope depends on which code edition applied when the home was built or last rewired.
Why a home might be missing either or both
Homes built or last rewired before these requirements existed in the code may have neither type of protection in the areas where it is now standard. This is not automatically a violation of the code that applied at the time of construction, but it does mean the home has less protection than current standards would call for. Renovations and panel upgrades are common trigger points for adding this protection, since the work is already opening up the relevant circuits.
Nuisance tripping
Both GFCI and AFCI devices occasionally trip without an obvious cause, which leads some homeowners to disable or bypass them out of frustration. This is a mistake. Repeated nuisance tripping usually points to a specific problem, a shared neutral, a particular appliance, wiring degradation, that an electrician should diagnose, rather than a reason to remove the protection.
Adding protection to an existing home
GFCI protection can often be added at the outlet itself or at the breaker, depending on the circuit. AFCI protection is typically added at the breaker. An electrician can assess which approach fits a given circuit and panel without necessarily requiring a full rewire.
What to ask if a home inspection flags this
Ask specifically which locations or circuits are missing protection, rather than accepting a general statement that the home needs GFCI and AFCI work. This lets you get an accurate quote and understand the actual scope before committing to the work.
Puffin Power adds and upgrades GFCI and AFCI protection in residential properties across Atlantic Canada, assessed circuit by circuit rather than as a blanket recommendation, with emergency service available if a device is tripping repeatedly and the cause is not obvious.
Talk to Puffin Power
If a home inspection or insurance review flagged missing GFCI or AFCI protection, contact Puffin Power or call (709) 769-9713 to get it assessed.
Published 2026-09-23 · About 3 minute read