GFCI Requirements Under the Canadian Electrical Code (CEC)

GFCI requirements, room by room

In plain language: if a receptacle is somewhere a person could be wet, barefoot or standing on damp ground, the CEC wants a GFCI on it. A GFCI trips in a fraction of a second when current leaks off the intended path, which is what happens when someone becomes part of the circuit. The protection can be a GFCI receptacle, a GFCI breaker in the panel, or a GFCI receptacle protecting others downstream of it.

• Bathrooms and washrooms Receptacles in a bathroom need GFCI protection. This is the most commonly cited GFCI requirement and applies to every receptacle in the room, not just the one beside the sink.
• Kitchens — within 1.5 m (5 ft) of a sink Receptacles within 1.5 m (5 ft) of the kitchen sink need GFCI protection, measured from the edge of the sink to the receptacle. Countertop receptacles at an island or peninsula are usually caught by this rule too. A dedicated fridge circuit further than 1.5 m from the sink is generally not.
• Outdoors Receptacles on the exterior of the house, on decks and porches, and on detached structures need GFCI protection, and should have a weatherproof “in-use” cover. Receptacles reached by a buried feeder to a shed or garage should be GFCI protected too.
• Unfinished garages, sheds and outbuildings Receptacles in an unfinished garage, workshop, shed or other outbuilding need GFCI protection. These floors are often concrete or dirt, which is a good path to ground.
• Laundry areas Receptacles within 1.5 m (5 ft) of a laundry tub or sink need GFCI protection. Many electricians protect the whole laundry area anyway, because washers, floor drains and wet floors are common. Confirm with your inspector how they read the layout.

Newer editions of the CEC and provincial amendments keep widening GFCI coverage (unfinished basements are a frequent example). The Ontario Electrical Safety Code and your local inspector have the final say for your project.

GFCI checklist

• Press TEST, then RESET. Test every GFCI receptacle monthly. It should click off and the load should lose power; RESET restores it.
• Check the LINE/LOAD wiring. Incoming power goes on LINE terminals. Put it on LOAD and the device may not protect anything, or may not reset.
• Know what it protects. One GFCI can protect receptacles wired downstream of it. Find the first one on the circuit before you start swapping devices.
• Use weatherproof covers outdoors. Receptacles should be in a weather-resistant (WR) GFCI with an in-use cover.
• Don’t reset a GFCI that keeps tripping. Repeated trips mean a real fault, moisture in a box or a damaged cord. Stop and find the cause.
• Replacing a GFCI receptacle doesn’t need a permit in Ontario. Running new wire, adding new circuits or adding outlets does require an ESA permit.

AFCI protection and the branch-wiring map

GFCI protects people from shock; Arc-Fault Circuit Interrupter (AFCI) protection guards against fire from damaged wiring. Modern Canadian Electrical Code requires AFCI protection on almost every 120V household branch circuit. The map below shows where AFCI, GFCI, both, or neither are required.

Key Ontario Electrical Safety Code Highlights

Modern electrical installations prioritize arc-fault protection across all living areas. Here are the core rules every homeowner must know:

• Kitchen Countertops (Rule 26-712 / 26-722) Requires a minimum of two 20A branch circuits. Outlets must be spaced so no point along a counter is more than 900 mm (3 ft) from an outlet. Outlets within 1.5 m (5 ft) of a sink must be GFCI-protected.
• Split Receptacle (15A Multi-Wire Branch Circuit) Caution When replacing an older kitchen split-receptacle (fed by a 3-wire red/black/white cable), you must break off the brass/gold tab connecting the hot terminals. Leaving this tab intact short-circuits both 120V phases together (240V direct short) and will instantly blow your breaker.
• Smoke Alarm Circuit Rule (Rule 30-500) In Ontario, hardwired smoke alarms are typically wired on a mixed circuit with a regularly used lighting branch. If the breaker trips, loss of room lighting alerts the homeowner immediately that fire protection has lost main power.
• ESA Permit Notice Replacing an existing outlet or switch does not require a permit. However, running new wire, adding new outlets, finishing a basement, or installing high-draw chargers strictly requires an Electrical Safety Authority (ESA) permit in Ontario.