Originally Posted By: Pop_Rivit
I've never had an electrical panel make noise. I suppose if it's a mediocre quality system then it might just be normal vibrations. However, if it were mine I'd start by turning off 1/2 of the breakers and wait 5 minutes. If it buzzes again, then it's the half that are still on. Turn 1/2 of those off, wait 5 minutes, and listen for the buzz. Narrow it down to the breaker(s) that are buzzing, and then figure out what's going on with it/them.
Circuit breakers do go bad and wires can work themselves loose.
If youre denying that 60Hz noise, amongst others, dont occur in electric equipment, Id have to question your hearing and your knowledge. Please do define what a "vibration" is in terms of electrical and magnetic phenomena, please...
All the same, be safe, OP, and I concur with the troubleshooting approach. Youll be able to neck it down quite likely.