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Type A rcd . EICR coding ? etc

aligarjon
Hi Guys.   Not been on for a long time, just had a bit of a search and couldn't really find anything so thought i would ask and see what you all thought.


1.  Are we or will we be coding type AC rcd's if there are LED's or induction hobs, lots of electronics  etc  present.

2. How much DC leakage does it actually take to saturate an rcd and cause  problem?

3. How much does a standard LED lamp or induction hob  leak ?

If we test an AC RCD with no load and it's fine then re-test it with all LED lights, induction hobs etc turned on and it operates correctly could we then say that it is ok with a note on EICR  OR EIC if installing any of the above.  


Obviously also on an EICR if the RCD then doesn't operate with it all on it becomes a C2 ?


Any thoughts



Gary
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  • 0
    AJJewsbury:

    I think the worry about additional protection is that the boiler could remove additional protection from everywhere downstream of the RCD - so picture nail into a cable upstream of the boiler (or elsewhere in the house if the RCCB is covering many circuits) and additional protection might be ineffective.


    I see three issues:


    (1) The boiler, or at least it's DC modulating pump will trip a type AC RCD in normal use. I assume the electronics are rather like the front half of a VSD, so that is perfectly possible. That would be obvious during commissioning.


    (2) A fault in the boiler might not trip a type AC RCD. I think that we have covered that one. If the boiler does not require RCD protection, then this possibility isn't a problem.


    (3) The boiler might blind an RCD, either in normal use, or under some fault condition which does not trigger ADS.


    I have asked Schneider whether their type AC RCDs are compatible with DC modulating pumps and I have asked Worcester to explain - i.e. to answer my original question.


    All this does seem to be a bit beyond the call of duty. Perhaps the householder should have told the plumber to fit a boiler which can cope with a type AC RCD? ?


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  • 0
    AJJewsbury:

    I think the worry about additional protection is that the boiler could remove additional protection from everywhere downstream of the RCD - so picture nail into a cable upstream of the boiler (or elsewhere in the house if the RCCB is covering many circuits) and additional protection might be ineffective.


    I see three issues:


    (1) The boiler, or at least it's DC modulating pump will trip a type AC RCD in normal use. I assume the electronics are rather like the front half of a VSD, so that is perfectly possible. That would be obvious during commissioning.


    (2) A fault in the boiler might not trip a type AC RCD. I think that we have covered that one. If the boiler does not require RCD protection, then this possibility isn't a problem.


    (3) The boiler might blind an RCD, either in normal use, or under some fault condition which does not trigger ADS.


    I have asked Schneider whether their type AC RCDs are compatible with DC modulating pumps and I have asked Worcester to explain - i.e. to answer my original question.


    All this does seem to be a bit beyond the call of duty. Perhaps the householder should have told the plumber to fit a boiler which can cope with a type AC RCD? ?


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