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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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    davezawadi (David Stone):

    The interesting effect is that the leakage seems to cause an increase in trip time, rather than a failure to trip when using my MFT to test.


    Smoking gun? Increase in trip time could well mean not tripping in a time (for additional protection) that saves someone's life. The trip times for RCDs are based on roughly a P90 demographic ("protects about 90 %") of adults.


    Of course, with most MFT it's perhaps not possible to generate a fault of negligible impedance (resulting in the machine recording a trip time) downstream of the rectifier's output? If I can think of a way of doing this, I'll post back on that.


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  • 0
    davezawadi (David Stone):

    The interesting effect is that the leakage seems to cause an increase in trip time, rather than a failure to trip when using my MFT to test.


    Smoking gun? Increase in trip time could well mean not tripping in a time (for additional protection) that saves someone's life. The trip times for RCDs are based on roughly a P90 demographic ("protects about 90 %") of adults.


    Of course, with most MFT it's perhaps not possible to generate a fault of negligible impedance (resulting in the machine recording a trip time) downstream of the rectifier's output? If I can think of a way of doing this, I'll post back on that.


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