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Something very strange is going on at my mother’s house. The oven, which is not built in but just a pigtail plug has been malfunctioning. She has ordered a new oven and is ready to put it in.

When trying to cut power to the outlet, there are no breakers that work. She’s even had my brother go under the house to see if there’s another box somewhere and there is not.

They have cut off the main breaker to the house and everything is off but the oven remains on.

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    Picture and location please! For many years the NEC allowed up to 6 properly grouped breakers to function as a residential service.One breaker labelled main often only turns off a portion of the panel, leaving range, dryer, hwt and other circuits to make up the other 5 allowed disconnects. – NoSparksPlease Dec 28 '20 at 18:04
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    I’m assuming she will just need to call an electrician but I just didn’t know if we were missing anything obvious. Every single breaker flipped to the off position does not affect the oven’s power. They went outside and turned off all power to the home and everything is off, but the oven continues to function??? – Whitney Burton Dec 28 '20 at 18:08
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    @NoSparksPlease Yeah, those were called a "split buss panel". Questions for the OP: Is there anything else that "stays on" like an electric water heater, electric clothes dryer, furnace? How old is the house? can you send pics of the main panel? – George Anderson Dec 28 '20 at 18:49
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    Can you post a picture of the electric meter and all the equipment right next to the meter? Weather doors open, do not remove any screws and definitely don't break any power company seals! Also, turn everything off and watch the meter. It should be still. Then turn the oven on - does the meter disc spin, or any little LCD segments change or dance or do a marqee effect? I'm wondering if they wired it to the wrong side of the meter in order to steal power. – Harper - Reinstate Monica Dec 28 '20 at 20:42
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    Can you post photos of your electrical panel please, as well of your electric meter and the equipment at the meter? – ThreePhaseEel Dec 29 '20 at 1:03

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