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<blockquote data-quote="Phoenix" data-source="post: 391859" data-attributes="member: 8133"><p>Gut feeling says cable damage on the ring if the MCB trips as well.</p><p></p><p>Needs IR testing and even if its not below the allowed minimum needs tracing out if it seems 'lowish'</p><p></p><p>Was called to a library for lights tripping in the back room and corridor, someone had been out, reset the breaker and left, it tripped just after he drove off. I tried flicking the breaker on and it stayed on for at least the 5 minutes I left it.... thought after hearing about the previous that I best dig deeper here. IR tested to 0.3 meg. Narrowed that down to cable between third and fourth fittings in back room, which was testing at 0.3meg L-E with both ends disconnected. Circuit that the board went back upto 30meg. Pulling the slack out the ceiling at the fittings showed rodent damage. But it didn't trip straight away, just from time to time. Left the last light disconnected and passed it back to facilities management company to have the rodents evicted</p></blockquote><p></p>
[QUOTE="Phoenix, post: 391859, member: 8133"] Gut feeling says cable damage on the ring if the MCB trips as well. Needs IR testing and even if its not below the allowed minimum needs tracing out if it seems 'lowish' Was called to a library for lights tripping in the back room and corridor, someone had been out, reset the breaker and left, it tripped just after he drove off. I tried flicking the breaker on and it stayed on for at least the 5 minutes I left it.... thought after hearing about the previous that I best dig deeper here. IR tested to 0.3 meg. Narrowed that down to cable between third and fourth fittings in back room, which was testing at 0.3meg L-E with both ends disconnected. Circuit that the board went back upto 30meg. Pulling the slack out the ceiling at the fittings showed rodent damage. But it didn't trip straight away, just from time to time. Left the last light disconnected and passed it back to facilities management company to have the rodents evicted [/QUOTE]
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