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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
    found this https://www.blakley.co.uk/sites/default/files/technical_files/TDS13_DC_IMMUNE_RCDs_0.pdf

    Showing a graph where 0.1A superimposed DC increases the trip current of a 30mA (presumeably type AC) RCD to about 115mA. 


    Regarding the OP's question of whether testing without loads and then re-testing with all loads on would be ok. Not sure whether this would work, since with all loads on, the normal residual currents might be near the trip current of the RCD, but the DC current might increase the trip current threshold. Time and ramp testing on a MFT wouldn't necessarily tell you what was going on.


    With regards to whether installing LED lights or induction hobs, on an existing AC RCD, makes the installation less safe, thus not complying with building regulations, who knows? Excellent question though.
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  • 0
    found this https://www.blakley.co.uk/sites/default/files/technical_files/TDS13_DC_IMMUNE_RCDs_0.pdf

    Showing a graph where 0.1A superimposed DC increases the trip current of a 30mA (presumeably type AC) RCD to about 115mA. 


    Regarding the OP's question of whether testing without loads and then re-testing with all loads on would be ok. Not sure whether this would work, since with all loads on, the normal residual currents might be near the trip current of the RCD, but the DC current might increase the trip current threshold. Time and ramp testing on a MFT wouldn't necessarily tell you what was going on.


    With regards to whether installing LED lights or induction hobs, on an existing AC RCD, makes the installation less safe, thus not complying with building regulations, who knows? Excellent question though.
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