I have a new term " Hertz Vibration" that referes to the hum , noise, or other audible vibration heard from electrical gear.

note previuous thread; https://www.electrical-contractor.net/ubb/Forum2/HTML/000235.html

I don't know if the term is valid, or if so, the noise measurable ( I beleive ballasts have a sound rating) or how this side effect is produced or anything else....
cranium firmly imbeded in large intestine here...please feel free to call in the jaws of life if needed..

I have had the opportunity to be working in a panel yes, live and hear breakers buzzing under a load, some i have held my finger on and altered the noise level
were's that dutch boy when ya need im'

If this is indeed a bona-fide phenomenon, i am curious as to the details, if i have just been gulible i'll go buy more lottery tickets...

[Linked Image]