Santa Clara County, California government facilities (bus maintenance yards, public works yards, agency engineering buildings, etc.) were filled with Federal Pacific panels and breakers from the 60's and 70s'. From '79 to '92 I hated working in any building that had them....when you'd open a breaker to shut down a circuit to replace an exhaust fan or repair some 277VAC highbay lighting, etc. there was a 6 in 10 chance the breaker would not allow a re-close to energize the circuit when you were finished. Also had a few that would trip but not open the circuit. I believe all this contributed to them initially losing their UL certification and ultimate exit from the circuit breaker business.
