Adding a new kitchen circuit to a Burlington restaurant: what the inspector will catch

Last month we were on a job at a Plains Road restaurant in Burlington — owner had bought a new induction range and a second walk-in cooler at a kitchen-equipment auction, and his question to us was "can you just run two circuits, we open Saturday." The answer was no, not because the work was hard, but because nothing about a commercial kitchen circuit addition is "just a circuit." There is the panel capacity question, the hood interlock question, the dedicated-circuit code requirement, the GFCI question, the ESA permit, and the inspector who will absolutely catch the shortcut. Here is the actual scope on a typical Burlington or Hamilton restaurant kitchen circuit job.

Step one: is there panel capacity

Most independent restaurants in the Golden Horseshoe were built into spaces that were not originally kitchens — strip mall units, converted retail, century-building main floors. The electrical service was sized for the original use, then a previous tenant put in a kitchen, then the current tenant has been adding equipment year over year. By the time someone wants to add an induction range and a second walk-in, the panel is often already at 90% capacity on paper and tripping under real-world peak load.

A real load calc has to happen first. The OESC commercial demand factors are different from residential, and the inspector will ask to see the calc on permit submission. If the existing service is at limit, the conversation shifts to a service upgrade or a dedicated kitchen sub-panel before anyone is running new circuits.

The hood interlock: the detail nobody budgets for

Every commercial cooking appliance under a Type 1 hood (gas range, char-broiler, fryer, induction over solid-fuel, anything producing grease-laden vapor) has to be electrically interlocked with the hood exhaust. If the hood is off, the appliance cannot run. The OBC and the Ontario Fire Code agree on this and the AHJ in Burlington enforces it.

What this means in practice for a new circuit:

• The new appliance circuit has to be fed through a contactor that is controlled by the hood control panel.
• The hood control panel needs a spare auxiliary contact for the new appliance, or it needs an external relay added.
• The wiring between the hood control and the appliance contactor has to be in conduit or MC cable, not loose Romex.
• Fire suppression system (Ansul, Range Guard, Amerex) also has to drop the appliance circuit on activation — the suppression system contacts wire into the same interlock.

This is where we lose a day on most kitchen circuit additions: the existing hood control panel does not have spare contacts, we have to add an external relay enclosure, and the suppression contractor has to come back to verify their system drops power correctly. Not a circuit. A small system change.

Walk-in compressor: dedicated circuit, the right way

A walk-in cooler or freezer compressor is a continuous load and the OESC requires it on a dedicated branch circuit. The details that get missed:

• Sized at 125% of the compressor FLA — the continuous-load multiplier. A 20A compressor lands on a 30A circuit, not a 20A circuit.
• Disconnect within sight of the compressor itself, lockable. Inside-the-cooler compressors get a wall-mounted disconnect outside the cooler door.
• GFCI protection is required on most walk-in cooler outlets under current OESC, with specific exceptions. Worth checking the model rather than assuming.
• Refrigerant alarm on some refrigerant types — separate low-voltage circuit, also has to be permitted.

The mini-split AC owner everyone wants to add

Restaurant kitchens are hot. Owners are buying ductless mini-splits and asking us to put them in for the line cooks. The electrical scope:

• Outdoor condenser unit needs a disconnect within sight at the condenser, and a dedicated 240V circuit sized to the unit nameplate.
• The communication wiring between indoor head and outdoor unit is low-voltage but still has to be in conduit if exposed.
• Penetrations through the building envelope have to be properly sealed and, in tenant fit-outs, often need landlord approval.

Receptacle additions: the GFCI question

A commercial kitchen has more GFCI requirements than people realize. Counter-area receptacles, dish-area receptacles, anything within 1.5m of a sink — all GFCI. Adding a new receptacle along a prep counter means GFCI protection, and ideally a GFCI breaker rather than a GFCI receptacle because the receptacle face will get hit with spray and soup and grease until it fails.

The inspector will check this. We have seen them write up restaurants for adding a non-GFCI receptacle within a metre of a hand sink that was added a year after the original layout.

Shared neutrals: the multi-wire branch circuit trap

Older restaurant kitchens often have multi-wire branch circuits — two hot legs sharing a neutral. The current OESC requires those to be on a common-trip handle-tie or a two-pole breaker so both legs disconnect together. Many older installs do not have this. If you are adding to an existing panel with multi-wire branch circuits, the inspector will check the handle ties before signing off.

While we are on it: the neutral conductor on a multi-wire branch circuit on a 120/208V three-phase service can carry more current than each individual phase under harmonic-rich loads (LED drivers, VFDs, computer power supplies). On a restaurant POS-and-LED retrofit we often upsize the neutral or split the circuits.

What the inspector will catch on a quick walkthrough

1. Cooking appliances not interlocked with the hood.
2. Walk-in compressors without lockable disconnects.
3. Missing GFCI protection at counter or sink-adjacent receptacles.
4. Open junction boxes inside cabinet or hood penetrations.
5. Romex (NMD90) used where the OESC requires MC cable or conduit in commercial cooking environments.
6. Aluminum bus or terminations on lighting circuits without antioxidant compound (common in older panels).
7. Panel directory not updated since the install.

The permit and scheduling reality

An ESA permit on a restaurant kitchen circuit addition is typically pulled and inspected as follows:

• Permit submission with load calc and one-line drawing: same day for straightforward scope.
• Rough-in inspection if anything is being concealed in walls or ceilings.
• Final inspection after commissioning, with the hood interlock and suppression integration tested in front of the inspector.

The bottleneck in Burlington and Hamilton in 2027 is the suppression contractor return visit. We are seeing one to two-week lead times for them to come back and verify the shunt trip on a new appliance circuit. Plan around it.

Doing this in your closed-hours window

For an operating restaurant the work happens overnight or Sunday-Monday. We do this routinely for clients across Burlington, Hamilton, Oakville, and Stoney Creek. Crew arrives at close, scopes and runs are done in conduit during the night, the morning prep crew walks into a finished install. The hood interlock testing and the suppression verification usually need a daytime window but they can be scheduled into the slowest period of the week.

When to call us

If you are adding equipment to an existing kitchen or planning a new fit-out, we handle commercial electrical work across Hamilton, Burlington, Oakville, Waterdown, Ancaster, Dundas, and Stoney Creek — and we will pull the ESA permit, coordinate the suppression contractor, and finish the work in the hours the restaurant is closed. Request a quote with a panel photo and the equipment nameplates and we will scope the job in writing.