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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
    Inside the type A RCD, the core may be larger, and the peak detector may be more symmetrical in its response to positive and negative peaks, but in all other respects there is not a lot different inside, certainly not much to justify a large price hike.

    I too have done some informal testing, but it is far from comprehensive - I can see the wisdom in recomending installing only  type A in future, but I share the view that the existing AC types will not suddenly rise up and strangle the user, indeed I think the majority, if not all  of them could safely be rebadged as A with no other changes, just that performance was never tested and cannot sensibly be guaranteed, and some designs as type A may be a bit more insensitive.


    The hard one is the smooth DC, but even there some limits can be set - a a DC small compared to the test limit of 30mA will have a small effect, and in general a desensitised RCD will still always trip once the AC amplitude exceeds the blocking DC, what is hard to say is if it will trip before that .


    As solar panels and EV batteries and so on proliferate, there is more scope for odd faults the put a true DC into the system, but these need managing case by case.

    regards

    Mike
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  • 0
    Inside the type A RCD, the core may be larger, and the peak detector may be more symmetrical in its response to positive and negative peaks, but in all other respects there is not a lot different inside, certainly not much to justify a large price hike.

    I too have done some informal testing, but it is far from comprehensive - I can see the wisdom in recomending installing only  type A in future, but I share the view that the existing AC types will not suddenly rise up and strangle the user, indeed I think the majority, if not all  of them could safely be rebadged as A with no other changes, just that performance was never tested and cannot sensibly be guaranteed, and some designs as type A may be a bit more insensitive.


    The hard one is the smooth DC, but even there some limits can be set - a a DC small compared to the test limit of 30mA will have a small effect, and in general a desensitised RCD will still always trip once the AC amplitude exceeds the blocking DC, what is hard to say is if it will trip before that .


    As solar panels and EV batteries and so on proliferate, there is more scope for odd faults the put a true DC into the system, but these need managing case by case.

    regards

    Mike
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