EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
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Dedicated circuit is one of those electrical terms that shows up on every appliance manual, home inspection report, and ESA permit — usually without much explanation. It matters because appliances that need a dedicated circuit will nuisance-trip, run poorly, or fail early on a shared circuit. This guide walks GTA homeowners through what a dedicated circuit is, which appliances require one under the Ontario Electrical Safety Code, and what happens if you skip it.
Direct answer: a dedicated circuit is a branch circuit that feeds exactly one appliance or one specific load. Nothing else is connected — no other outlets, no lights, no other devices. The circuit exists to serve that one appliance, and the breaker is sized to the appliance’s specific requirements.
Compare that with a general-purpose branch circuit, which feeds multiple outlets or lights across a room or an area of the house. General-purpose circuits are shared by design and shed load when overloaded. Dedicated circuits are engineered to always have full capacity available for their one appliance.
The Ontario Electrical Safety Code specifies each of these in different sections — mostly Section 26 (Installation of Electrical Equipment).
Direct answer: dedicated circuits exist for four reasons — (1) some appliances draw enough current that sharing a circuit would routinely trip the breaker, (2) some appliances create electrical noise that would disrupt sensitive devices on the same circuit, (3) some safety-critical loads (sump pumps, alarm systems) need to run even if the rest of the house has a fault, and (4) some appliances have specific overcurrent protection requirements that a shared circuit cannot meet.
Kitchen counter split circuits are the classic Ontario example — the OESC requires kitchen counter receptacles to be dedicated so a coffee maker, kettle, and toaster running at the same time do not overwhelm a shared circuit.
Direct answer: the appliance nameplate specifies the breaker size and the conductor gauge. Read “Maximum Overcurrent Protection” and “Minimum Circuit Ampacity” and use exactly those values — not one size up, not one size down. Our post on why breaker size is really about the wire covers the conductor-sizing principle.
Common conductor sizes match to common dedicated circuits — 14 AWG for 15A, 12 AWG for 20A, 10 AWG for 30A, 8 AWG for 40A, and 6 AWG for 50A dedicated 240V circuits.
Direct answer: adding a new dedicated circuit is an ESA-notified job in Ontario. It is not maintenance and it is not homeowner-permitted work unless the homeowner files their own notification and does all the work themselves. The Electrical Safety Authority requires notification and inspection on new branch circuits.
Direct answer: a new dedicated 15A circuit in a typical GTA home costs $350-700 depending on cable run and finished-wall access. A 20A dedicated is similar. Higher-amperage circuits (30A dryer, 40A range, 50A EV charger) run $500-1,200 depending on run length and terminations.
Our post on how to add a new circuit covers the install procedure in more detail. Panel capacity has to be confirmed first — see panel overload signs.
In our experience adding dedicated circuits across the GTA, the single most valuable pre-quote question is what else the homeowner is planning within the next 5 years. A dedicated circuit is a one-time cost per appliance, and if you know you are adding an EV charger, a heat pump, and a whole-home battery in that window, we can plan the panel and the cable runs to accommodate all three from the start. Homeowners who add one dedicated circuit at a time end up paying for panel work, box work, and permit filings multiple times. Bundling saves the second and third permit fees and the second and third utility disconnects. Our post on panel-upgrade permits covers the bundling logic.
A circuit that serves only one appliance or outlet, with no other loads sharing it.
Range, dryer, water heater, HVAC, fridge, dishwasher, garbage disposal, microwave, EV charger, hot tub.
Bathroom receptacles need a dedicated 20-amp circuit under current Ontario code.
Continuous heavy motor and heat load would overload a shared kitchen circuit.
Trace the breaker: if only one device on the circuit turns off, it is dedicated.
Planning a new appliance install and need a dedicated circuit sized right in your GTA home? Book an ESA-certified electrician for a written quote and permit. Call us at 416-838-9006 or visit our contact page — we will get back to you the same day.
Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp
