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Rcd Test Switch and circuit not working

Discussion in 'Electrics UK' started by WSB, 7 Apr 2021.

  1. JohnW2

    JohnW2

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    Don't worry - I also initially missed that it was 'discontinued' :)
    Whilst that is all technically/theoretically true, I would say that far more important is ...
    That is what matters, electrically, rather than bureaucratically.

    The problem with 'talking to MK' is, of course, that MK no longer manufacture MK-branded CU's and components thereof, whilst the people who now do manufacture them were not involved when the now-discontinued ones were being manufactured (by MK).

    As above, electrically speaking the important thing is that replacement devices should be dimensionally compatible with those which they are replacing.

    Kind Regards, John
     
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  3. WSB

    WSB

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    Thanks both.
    Bit annoying that mk discontinue it.
    Only had that fitted and signed off 9 years ago.
    So theoretically if they discontinue an item in the CU, I could end up replacing everything, so that it all matches?
     
  4. JohnW2

    JohnW2

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    It's not just that MK have discontinued it - MK themselves have stopped making CUs and everything which goes in them - but another company has acquired a licence to continue manufacturing MK-branded items.
    I suppose that depends upon what you mean by 'theoretically'. I've told you what I personally feel is what matters electrically - and I could observe that it's certainly the case that there are countless (quite probably millions) of CUs out there which contain devices of mixed brands.

    Kind Regards, John
     
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  5. WSB

    WSB

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    All is well.
    It just so happens that I have had the plastic cu in my rental property updated to metal to give me an advisory free EICR report.
    When the electrician popped round today he gave me the old plastic cu which happened to contain the exact same mk rcd and mcb that I need to replace in my home cu.
    Bingo!!!!
    I'll get that sorted after work today in time for my wife to get her oven back. Heh Heh...
    Thanks for all your help and advice. Very handy.
    Much appreciated
    Cheers
     
  6. oldbutnotdead

    oldbutnotdead

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    Result! Have a good look at the busbar on your existing cu, make sure it hasn't got too hot & gone soft
     
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  8. WSB

    WSB

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    Looks OK. Showed it to the electrician and he was happy with it too.
     
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  9. JohnW2

    JohnW2

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    Great news - you're a lucky man!

    Kind Regards, John
     
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  10. WSB

    WSB

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    Just to let you know.
    Swapped in the rcd from my spare cu last Friday. All went well and everything working fine again now.
    Just had to prize the rcd away from the neighboring mcb as the heat had fused them together. Replaced that section of bus bar too as where the arcing was occurring it was quite charred.
    So that plus my rental property now having a squeeky clean EICR with no C3s you could say that I'm a happy man.
    Thanks all again chaps!!!!
     
  11. securespark

    securespark

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    Just to confirm, you should replace ALL heat damaged items with undamaged ones, including busbar, cabling, RCDs, RCBOs and MCBs.
     
  12. DIYnot Local

    DIYnot Local

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