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Combo Oven Microwave Electrical Wiring

How to Wire a Circuit for a Combo Oven and Microwave – If this is a true combo unit that is physically connected together then it may require one circuit or power source.


Circuit Requirements for Oven Microwave Units

Electrical Question: A COMBO MICROWAVE AND WALL OVEN REQUIRES 120VOLT.

  • A COMBO MICROWAVE AND WALL OVEN REQUIRES 120VOLT FOR THE MICROWAVE OVEN AND 240VOLT FOR THE WALL OVEN.
  • BOTH VOLTAGES ARE PROVIDED BY ONE 4 WIRE CABLE WITH (DUAL) CIRCUIT BREAKER PROTECTION FOR THE 240 VOLT CIRCUIT.
  • IT LOOKS LIKE THIS LEAVES THE 120VOLT MICROWAVE OVEN (AS WELL AS WALL OVEN COMPONENTS OPERATING AT 120VOLT SUCH AS CONTROLS/LIGHTING/CONVECTION FANS) WITHOUT THE USUAL 15 AMP CIRCUIT BREAKER PROTECTIONS SINCE THE 240VOLT. CIRCUIT, WHICH ALSO CARRIES THE 120VOLT CIRCUIT HAS (DUAL) 30 AMP CIRCUIT BREAKERS.
  • IT ALSO LOOKS LIKE WHEN THE MICROWAVE OPERATES AT THE SAME TIME THAT THE WALL OVEN IS AT PEAK POWER, AND THE CIRCUIT BREAKER MIGHT TRIP.

AM I OVERLOOKING SOMETHING?

This electrical wiring question came from: Ray, a Other from Avon, Connecticut.
See more about Home Wiring for Connecticut

Dave’s Reply:
Thanks for your electrical wiring question Ray.

How to Wire a Circuit for a Combo Oven and Microwave

  • Ray, if this is a true combo unit that is physically connected together then it may require one circuit or power source.
  • The internal wiring will then provide protection either through internal fuses or high temperature rated insulated wires.
  • As you have stated, this combo oven microwave unit requires a 4-wire circuit which provides the neutral conductor as needed for the 120 volt microwave power.
    • Consult the manufacturers installation manual and the nameplate information for the exact circuit voltage and amperage, as this is always the final word about the required circuit power, and will ensure that your unit will be covered under warranty in the event of a problem.

The Following links will assist you with your Oven Circuit:

electrical circuit
home-electrical-circuits

  • Electric Circuit Listing
  • The size of the home electrical service panel is designed by calculating the square footage of the home and factoring in the code requirements for the electrical circuits that are required.

circuit breaker
2-pole-circuit-breaker

  • Electrical Wiring Protection using Circuit Breakers
  • A guide to home electrical circuit breakers and how they work to protect your electrical wiring. When properly installed, your home electrical wiring is protected by a circuit protection device.

electrical wire
electrical-wire

  • Electrical Wire for the Home
  • Complete listing of electrical wire types and parts used for home projects with electrical code information serves as selection guidelines.

oven wiring
oven

  • Wiring Options for a Kitchen Oven
  • Fully Described Kitchen Electric Oven Installation with a typical 220 Volt electric circuit. You may find yourself with either a 3-wire or 4-wire electric oven. Lets look at how the electric oven is wired and the possible solutions if your circuit does not seem to the same.

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FAQs Frequently Asked Questions and Comments

2 Responses to “Combo Oven Microwave Electrical Wiring”
  1. Joseph Wenthur Sr says:

    I have a Microwave that is plugged in but it keeps going out while in use then the microwave resets itself. I was going to install a new wall recepticle but didn’t know if I need a special recepticle.

    The one that is in the wall has 4 wires (2 black & 2 white) going to it.

    Not sure if that means they run both the Oven and Microwave off the same recepticle.

    Can you help?

    Thanks
    Joe

    • Dave Rongey says:

      Hi Joseph,
      If the microwave oven is tripping the circuit breaker then a dedicated circuit may be required, however if the microwave is not tripping the circuit breaker then there may be a problem with the oven unit itself. Standard 120 volt microwave ovens are compatible with a 15 or 20 amp 120 volt receptacle depending on the size of the circuit respectively. I would suggest connecting the microwave to a different outlet and give that a try. If the same thing happens then the microwave oven may need to be serviced or replaced.
      Dave

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