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Random buzzing noise in outside wall

16 years ago

I have this random buzzing noise in an outside wall of my house. On the other side of the wall is a new 200 Amp box and the electric co. meter. even after switching off the master breaker in the outside box, the buzzing can still be heard, at random times.Not sure if the buzzing is from the box or the meter. Had the electric co. come out and check the meter and problems noted, and we still hear the buzzing. Even in the middle of the night, when most of my electricity usage is minimual, the buzzing randomly occurs .Any help would be appreciated.

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