I was trouble-shooting a pole mounted parking lot lite, the panel was a 277-480V remote contolled Square-D, the lites are 480V so the breakers are 2 pole when using a volt meter you should get 277 to ground on both legs and get 480V phase to phase , on a bad breaker you will still get 277V to ground but phase to phase you will get 0 volts , I find that hard to grasp. Here is a good one the 2 pole breaker below the one I was working on read 577V to ground on one phase and 277V on the other,phase to phase was aprox 920V, explain this if you can ?? I just replaced my battery in my volt meter.. the meter was fine, we also used another volt meter with the same results?? see if you can answer this please
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Bad 480V Circuit Breaker ??