Originally Posted by
Andrew_van_Zyl
Called out to investigate why several rows of carport lights are not working.
The complex is 9 years old and electrical installations seems good (judging by the use of ferrules used for circuit breaker connections)
The CB trips, but not immediately, after switching on. No earth leakage. Continuity between live and earth when tested at the DB
My approach was to try and isolate the short by disconnecting sections of the circuit (each carport) and testing if the short was downstream or upstream of the disconnection.
I've pretty much disconnected everything but the CB still trips meaning there is more to this circuit that what I have seen.
I've taken a 60m trail lead to test continuity between the live at the DB and where I think the circuit begins, but am not finding it.
I've also taken out the LED tubes in the light fittings in case one of them has been inserted the wrong way round - had this on a previous site.
Any suggestions from the old hands?
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