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  1. rod1924
    Online

    rod1924 Guest

    New dual RCD CU fitted today. IR tests ok for circuits up and down albeit UP has only L/N into CU. Put on separate RCD's, down ok but up trips both RCD,s. Tried both in one MCB: Down ok till turning on any up light then RCD trip

    Any help really appreciated as brain frazzled
     
  2. bigbaddave
    Offline

    bigbaddave Electrician's Arms

    Location:
    In a Flat
    Shared Nutural.. Come on really.. You have to ask...
     
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  3. Marvo
    Offline

    Marvo GMES....You absolute beauty. YOU ROCK DUDE!!!! Staff Member

    Location:
    South Africa
    Crossed or borrowed neutral?
     
  4. Sintra
    Offline

    Sintra The Innkeeper Staff Member

    Location:
    Belfast/London
    Shared neutral most likely suspect.
     
  5. Dan the spark
    Offline

    Dan the spark Electrician's Arms

    Location:
    Woodley, reading
    Hi rod, burrowed neutral sounds likely but when u say u tried them both in same mcb and they tripped, had u put the neutrals onto the same bar also?
    Id take a look at the landing/hall 2-way as this is normally the culprit, pinch a neutral from the nearest light
     
  6. GLENNSPARK
    Offline

    GLENNSPARK Electrician's Arms

    Location:
    west yorks.
    whenever undertaking a C/U change on an install....can you please IR test between the neutrals first to make sure their clear..Thank you.
    Glenn.
     
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  7. rod1924
    Online

    rod1924 Guest

    Thanks for the replies (I knew it was a borrowed neutral) but I am looking on a fix to solve the issue (N were terminated together...answering previous questions).

    Last job was the same (borrowed N) but with RCBO's. Using one RCBO solved the issue....and borrowed N stated on Installation Report.

    So, any other remedies?
     
  8. lister101
    Offline

    lister101 Regular EF Member

    Location:
    Helsby
    5W light bulb might just do it:D
     
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  9. rattlehead85
    Offline

    rattlehead85 Electrician's Arms

    What!! You left a potentially dangerous condition in an installation and noted the fact on an EIC? You should have remedied this or at the very least informed the customer and issued a danger notification cert signed by both parties if they refused to get this seen to! at least you would have coveted yourself! Or was this an EICR you was carrying out?
     
  10. rod1924
    Online

    rod1924 Guest

    FFS Rattlehead, obviously the client was informed but would not pay for remedial work. Advice sought from my body and all details recorded. But thanks for the advice
     
  11. GLENNSPARK
    Offline

    GLENNSPARK Electrician's Arms

    Location:
    west yorks.
    well then you slap `em with a danger notice...
     
  12. bigbaddave
    Offline

    bigbaddave Electrician's Arms

    Location:
    In a Flat
    Please tell me this is in your own home?? If its a paying customer id be a tad upset.

    As for sorting it. What load is on the two lighting circuits? Either create one circuit if its not going to become overloaded.. or sort your borrowed nutural problem.. Its basically one circuit sharing a nurural from another circuit. Usually the landing light to save running 3 core upstairs..

    If you have to ask how that is corrected then i have to question your ability..

    You a qualified spark mate?
     
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  13. bigbaddave
    Offline

    bigbaddave Electrician's Arms

    Location:
    In a Flat
    Seems to be a slight contradiction from the OP moving through the posts.. From not having a clue in post one and knowing the fault once told.. Dont try and pull the wool over peoples eyes..

    Its so blooming obvious..
     
    • Like Like x 1
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