Intermittant brief buzz in service panel
I have an intermittant buzz coming from my service panel. The buzz lasts less than 1 second, and occurs as often as every 5 minutes or as seldom as once an hour.
I have removed and inspected all breakers, the bus bar and all wire connections with nothing unusual noted, so I figure it must be inside a breaker, but I don't know which one. I haven't had any breakers trip or fail, though this has been going on at least a year.