Service / Commercial Electrical
A walk-in cooler needs a dedicated circuit and a disconnect at the condensing unit. A walk-in freezer adds defrost heaters, a heated door frame, heat-traced drains, and often a heated floor, each on its own circuit. WFE runs that electrical as part of the build: feeds, disconnects, controls, alarms, and vapour-proof lighting, pulled under permit by ESA-licensed 309A electricians on our own crew and inspected before start-up. Commercial and industrial sites only.
Scope
A freezer has more circuits than a kitchen line. Every one of them is sized, labelled, and inspected before the box is cooled.
Every condensing unit gets a dedicated circuit and a fused or non-fused disconnect within sight of the unit, on the roof or at grade. Evaporator fans, defrost heaters, door-frame heaters, drain heat trace, and floor heat each get their own circuit sized to the nameplate, never daisy-chained off a kitchen panel.
Walk-in freezer buildsWarehouse racks and multi-compressor systems run on 600V three-phase; controls, lighting, and small evaporators run on 208V or 120V. We set the sub-panel, the step-down transformer, and the feeders so a refrigerated building has the capacity it needs on day one and room for the next expansion.
Custom cold storageTemperature controllers and defrost timers wired and set, high-temperature alarms with a dry contact for your monitoring, motorized sliding-door operators with safety edges, and vapour-proof LED fixtures rated for the box temperature. The same crew wires the door it just hung.
Walk-in cooler buildsCircuits by box
The circuit list grows with the box temperature. This is what gets pulled, by box type, on a WFE build. Five boxes, from one circuit to a sub-panel.
Walk-in cooler
Condensing unit, evaporator fans, lighting
Disconnect at the unit, controller on the door side
Walk-in freezer
Condensing unit, fans, electric defrost, door-frame heater, drain trace, floor heat
Defrost heaters on their own breaker, heated floor on a GFCI-protected circuit
Blast-freeze zone
Dedicated low-temp system and high-velocity coil on separate feeds
Built into a custom freezer, not a cabinet
Cold room or process room
Multiple evaporators, washdown-rated fixtures, GFCI receptacles
NEMA 4X boxes where the room is hosed down
Refrigerated warehouse
600V rack feed, step-down transformer, lighting and control sub-panel
Load calculation submitted with the permit
By site
Who, what, and the paper
What the inspector, your insurer, and the next technician want to see on the electrical side of a cold-storage build.
Why WFE for the electrical
On site
Real WFE installs across Ontario. No renders on this page.
600V disconnects, a step-down transformer, and the distribution panels that feed the refrigeration and the rooms around it.
Motorized slider with a safety edge, its operator and controller wired by the crew that hung the door.
Controller, door operator, and alarm wired in conduit on the outside of the box, where a technician can reach them.
Deep Dive
The electrical requirements for a walk-in cooler come down to a dedicated circuit sized to the condensing unit nameplate, a disconnect within sight of the unit, a separate circuit for the evaporator fans and lighting, and a temperature controller mounted where staff can read it. A self-contained unit on a small restaurant walk-in may run on a single 208V or 240V circuit; a remote rooftop unit needs a feed to the roof and a disconnect up there.
Sharing a breaker with kitchen equipment is the mistake we see most on boxes built by others: the fryer trips and the cooler goes dark. The walk-in cooler page covers the rest of the build.
A walk-in freezer carries everything a cooler does plus the circuits that keep it from icing shut: electric defrost heaters in the evaporator, a heated door frame so the gasket does not freeze to the jamb, self-regulating heat trace on the drain line, and on slab-on-grade builds a heated floor or under-slab heat to stop frost heave. Each of those is its own circuit, and the defrost heaters draw more than most people expect.
We size the panel for the total, wire the heaters on their own breakers, and log the amp draws at commissioning. The walk-in freezer page covers floors, doors, and panels; the commercial plumbing page covers the drain the heat trace protects.
Warehouse-scale cold storage runs on 600V three-phase. A multi-compressor rack, a remote condenser, and a row of long-throw evaporators each need a fused disconnect and a feeder sized from a real load calculation, plus a step-down transformer and sub-panel for the 208V and 120V loads: controls, lighting, door operators, alarms, and receptacles.
We submit the load calculation with the ESA permit, stage the electrical with the racking so nothing lands behind a pallet position, and commission zone by zone. See custom cold storage for the envelope and commercial HVAC for the machinery the feeds serve.
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