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3-week delayed CB trip. Huh??

1446 Views 8 Replies 9 Participants Last post by  chicken steve
We have several branch banks that have been installed with no problems (same lighting installation) but with no problems. We have ONE site that has a 20A breaker (can you believe it's circuit breaker #13) tripping almost exactly about every three weeks that powers a track lighting branch circuit in the bank lobby. Anybody ever hear of an "overload" or "fault" condition that might cause such a delayed trip response?
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First thing I'd do is put a monitor on it to see if it's an overload or a short.
Yep, makes a big difference. If it's a short, it might mean there is something wrong in the circuit, like maybe a power supply if it's LV lights on the tracks, and it takes 3 weeks for it to over heat enough to make something short out. I had one like that.


If it's an over load, it might also be that there is some sort of cyclical load that only comes on every 3 weeks or so and causes a low voltage condition, then because this track light circuit is close to the limit, that pushes it over.

Or maybe its a bank robber tapping into the track lighting circuit for his power drill or grinder, and he can only get time off of work every 3 weeks to work on making his hole.
 
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When the circuit is on and holding, what is the current on the conductors?
 
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