I work in a campus that is filled with federal pacific breakers and panels.
We have thousands of them.
50% of the time the breaker will not trip on over current. The breaker will make a humming sound but it will hold strong w/o tripping.
My theory at first was the lack of exercise on these breakers as they are in a state facility with little to zero preventative maintenance.
But after hearing all of these complaints I'm not so sure it isn't the breakers that aren't the culprit.
