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Brand new microwave trips circuit as soon as it is plugged in, but does not trip the circuit the microwave is on

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  • a1servicesci Oct 01, 2009

    customer just moved into house , we are the electricians that are adding the circuits for the new kitchen, the circuit is a brand new dedicated circuit. when the new otr microwave is pluged in it trips an different breaker controling misc outlets in the house including the dinning room lights. tested the new circuit and no problems. the microwave is tripping the breaker as soon as it is pluged in and has a small arc mark on the ground lead on the cord. if the microwave is used with an adapter to bypass the ground it does not trip any circuits

  • a1servicesci Oct 01, 2009

    do you mean reverse polarity inside of the unit? the receptacle is wired correctly. the breaker that trips is not the circuit the microwave is on.

  • a1servicesci Oct 01, 2009

    yes this is correct, the circuit that the microwave is plugged into will stay live , while the other circuit trips the second breaker. the house is 50 yrs old, customer just moved into the house and decided to remodel the kitchen so we ran dedicated circuits. the circuit that trips controls some lights in the dinning room and some other outlets in the house, i think there is a gfci in a bathroom with nothing connected to the load side. We didnt spend to much time investigating yet, thought i would see if it could be the microwave, i believe it is a ge microwave that is brand new

  • A Miller May 11, 2010

    Im sorry, can you tell me more about your trouble? Exactly what is happening?



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Sounds to me like there is a reverse polarity somewhere ... Id be looking inside as how the power cord connects.

If you plug it in and blows the breaker, must be hot wire to ground.

Please let me know what you find.

I hope this helps sort your trouble out.


Posted on Oct 01, 2009

  • A Miller Oct 01, 2009

    Let me tell you back what I think you are telling me ...

    There are two circuits. circuir A powers a fan in the living room. circuit B powers the microwave (but nothing else). The fan is running fine on circuit A until you plug the microwave into Circuit B. As soon as you plug the microwave into circuit B, Circuit A pops. Is that correct?

    I was thinking the wires were improper inside the oven, yes.

    Im thinking there is something in a junction box somewhere that you may not know about. This is a new house and people are living in it?

  • A Miller Oct 01, 2009

    So you plug the oven in and the oven line remains hot but the light line goes dead?

    There has to be a cross somewhere ...

    There may be a cross buss situation somewhere. Can you confirn the breakers involved are on opposite legs of the panel?

    What happens if you put the breakers on the same leg?



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The other possibility is a short or loose connection. If splitting appliances onto their own circuits doesn't fix this you would probably want an electrician to come in and check for other underlying causes which could represent a fire hazard.

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