Do I need a dedicated circuit for my microwave?

Most microwaves don't require a dedicated circuit, but it depends on the wattage and your kitchen's existing electrical setup. Standard countertop microwaves (700-1000 watts) can typically share a 20-amp kitchen circuit, while high-powered units or built-in models may need their own dedicated circuit.

Understanding Microwave Power Requirements

Countertop microwaves typically draw between 8-15 amps when running. A standard 1000-watt microwave pulls about 10 amps, which can safely operate on a shared 20-amp kitchen circuit alongside other small appliances. However, if you're running multiple appliances simultaneously - like a toaster, coffee maker, and microwave - you might trip the breaker.

Built-in or over-the-range microwaves often have higher power requirements, sometimes exceeding 1500 watts. These units frequently benefit from a dedicated 20-amp circuit to ensure reliable operation and prevent nuisance tripping. Commercial-grade or convection microwaves almost always require dedicated circuits due to their substantial power draw.

Ontario Electrical Safety Code Requirements

The OESC doesn't specifically mandate dedicated circuits for most residential microwaves, but it does require adequate capacity for all connected loads. Kitchen circuits must be 20-amp minimum, and you need at least two separate 20-amp circuits serving kitchen countertop areas. If your microwave consistently trips breakers or causes lights to dim when starting, you likely need additional circuit capacity.

When You Should Install a Dedicated Circuit

Consider a dedicated circuit if your microwave is over 1200 watts, if you frequently experience tripped breakers in the kitchen, or if you're installing a built-in unit during a renovation. A dedicated 20-amp circuit costs approximately $300-600 to install, depending on the distance from your electrical panel and any drywall patching required.

Safety and Code Compliance

Any new circuit installation requires an ESA permit and must be performed by a licensed electrician. The circuit needs proper GFCI protection if the outlet is within 1.5 meters of a sink, which applies to most kitchen installations. Never attempt to install new circuits yourself - this work requires expertise to ensure proper wire sizing, breaker selection, and code compliance.

For a professional assessment of your kitchen's electrical capacity and microwave requirements, Electrical Ottawa can evaluate your specific situation and ensure safe, code-compliant installation.

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Electrical Ottawa connects you with vetted, ESA-licensed electricians from the Ottawa Construction Network:Ottawa Electrical Contractors:

• Ring Electric Inc.
• LB Electric
• Home Town Electrical Services