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Simple PIR and LED Tube light... ARGH!

Discussion in 'Electrics UK' started by BenB1980, 13 Oct 2020.

  1. BenB1980

    BenB1980

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    Can anyone tell me what's going wrong here please? I have a feed into my shed with a simple little "garage consumer unit" on the wall... The type you get from screwfix etc. There are 4 sockets running out of the 32A MCB (not shown on my drawing) and a single pendant light hanging in the middle of the shed operated from a PIR on the 6A MCB. It was all installed and signed off by a professional electrician.

    All I'm trying to do is replace the pendant light with a 5ft LED strip light. I removed the old light, installed the new tube and now the 6A MCB trips when I try to turn it on. After some internet research leading to possible inrush current problems and some suggested that a Type C MCB can solve the problem... I've now tried that but it still trips. Wiring diagram attached.

    I'm completely at a loss as to what to do/try next?! Maybe just resort to a traditional tube instead I guess?!?!

    Thanks in advance...

    PS I should also say that I've checked the PIR and it states it is suitable for LED use... I've also bypassed the PIR and the same problem still occurs...
     

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  3. Sureitsoff?

    Sureitsoff?

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    have you connected to the wrong end of the tube? some have the two unused pins shorted
     
  4. BenB1980

    BenB1980

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    Valid point. But checked all that and all fine. I’ve even tried a different tube from a different manufacture now too...
     
  5. EFLImpudence

    EFLImpudence

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    What is that to the right of the 6A MCB?

    Whatever it is, it is not wired correctly.
     
  6. BenB1980

    BenB1980

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    It's the RCD... Might not have drawn it correctly to be fair! Will check...
     
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  8. EFLImpudence

    EFLImpudence

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    Ok. If it doesn't trip, it must be alright.
     
  9. AdrianUK

    AdrianUK

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    What happens of you powerup without the tube in the fitting???

    Its not gonna be an inrush problem with one tube on a 6A MCB.
     
  10. BenB1980

    BenB1980

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    Just to confirm, I did draw it wrong! Should have taken a photo rather than rely on my memory!! (Supply N goes into RCD...)

    Anyway, sent a picture to my electrician who seems to think it should be working absolutely fine. So he’s popping in tomorrow.
     
  11. BenB1980

    BenB1980

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    Just to round up this post... Electrician has been this morning and was as dumbfounded as me. Turns out it was the PIR. He had a (different) one on the van and, after swapping it over, it now all works fine! He still doesn't know why it happened and has never seen it before!
     
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  12. DIYnot Local

    DIYnot Local

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