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Thread: Complex carport lights

  1. #1
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    Complex carport lights

    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?

  2. #2
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    Quote Originally Posted by Andrew_van_Zyl View Post
    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?
    Have you measured the actual current draw ? Could be a faulty circuit breaker. Next would be to do insulation resistance test on the conductors.

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    Andrew_van_Zyl (11-Apr-24)

  4. #3
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    Thanks Jaws. Current draw before tripping is 38A (it's a 10A breaker)
    I'm working through this one - the circuit has several sub-circuits feeding rows of townhouses so I started at the beginning, isolated the feed to the next rown, connected that rows lights and worked my way down. I've cornered the issue at the last row (it would be!) so need to go back and check it out.

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