Had a service call today to check out a breaker that had tripped earlier in the week. Turns out it was the 2000A main w/ GFP. They had called the utility company and they told them to have an EC come out to look at the bussing and check for bad connections there.
I wasn't able to open all sections and look at all the bussing but what i saw all looked good. I also have an IR camera and there is no excessive heat anywhere i could see so I don't think that overcurrent from loose connections was the problem.
They did have a new piece of equipment installed the week before and the only thing I could think was that maybe there was a small ground fault in the motor and that tripped the Main because of the ground fault protection. This is the first time this has occured as far as anyone there could remember and it was 3 days ago so it is kind of hard to backtrack and they haven't had any problem since.
I'm just wondering if anyone with more experience with these large GFP'd breakers tripping has any better ideas on things to look for.
I wasn't able to open all sections and look at all the bussing but what i saw all looked good. I also have an IR camera and there is no excessive heat anywhere i could see so I don't think that overcurrent from loose connections was the problem.
They did have a new piece of equipment installed the week before and the only thing I could think was that maybe there was a small ground fault in the motor and that tripped the Main because of the ground fault protection. This is the first time this has occured as far as anyone there could remember and it was 3 days ago so it is kind of hard to backtrack and they haven't had any problem since.
I'm just wondering if anyone with more experience with these large GFP'd breakers tripping has any better ideas on things to look for.