Does a Microwave Need a Dedicated Circuit?
The short answer: yes, most built-in and over-the-range microwaves should be on a dedicated circuit. For countertop microwaves, it's strongly recommended even if not always required by code.
Why Microwaves Need Dedicated Circuits
Microwaves draw significant electrical current — especially during the heating cycle. Running them on a shared circuit with other appliances risks tripping the breaker or, worse, overloading the wiring. The National Electrical Code (NEC) and most local codes require dedicated circuits for built-in microwaves.
How Many Amps Does a Microwave Use?
- 700-watt microwave: approximately 5.8–7 amps
- 900-watt microwave: approximately 7.5–9 amps
- 1,000-watt microwave: approximately 8.3–10 amps
- 1,200-watt microwave: approximately 10–12 amps
Most microwaves draw 10–15 amps peak. Add in startup surge and shared circuit loads, and a 15-amp shared circuit is easily overloaded.
What Breaker Size for a Microwave?
Most countertop and over-the-range microwaves work on a 15-amp, 120-volt dedicated circuit. Some higher-wattage models may require a 20-amp circuit. Check your microwave's specification label for exact requirements.
Can You Plug a Microwave Into Any Outlet?
Technically, a standard 120V outlet will work, but it's not recommended if it's a shared circuit. For countertop microwaves, try to use an outlet that isn't sharing a circuit with other high-draw appliances.
Microwave Repair vs. Electrical Issue
If your microwave keeps tripping the breaker, it could be the circuit (overloaded or faulty breaker) or the microwave itself drawing excessive current (failing capacitor or magnetron). Have both the appliance and the circuit inspected.
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