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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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    Such tests are very interesting - its a pity the manufacturers do no do something similar and stick to the prescribed tests only. I'd be very interested if you ever get time to write them up.


    As regards synchronising/ triggering and mis-using an MFT,

    If you return the earth core of the 3 wire tester to neutral, it will never trip the RCD, looking instead like a normal load, but you could use the current in that lead as a  trigger signal to fire an SCR or similar to create a different sort of fault further on.


    This is really a job for a dual channel  oscilloscope and some suitable rated voltage dividers however, as the other problem is that the tester looks for falling L-N voltage to decide the RCD has tripped and once you start adding reservoir capacitance or external DC sources, the voltage may be held up from the load end,  and that  very simple 'has the power gone' detection is not to be relied upon any more.

    regards Mike
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  • 0
    Such tests are very interesting - its a pity the manufacturers do no do something similar and stick to the prescribed tests only. I'd be very interested if you ever get time to write them up.


    As regards synchronising/ triggering and mis-using an MFT,

    If you return the earth core of the 3 wire tester to neutral, it will never trip the RCD, looking instead like a normal load, but you could use the current in that lead as a  trigger signal to fire an SCR or similar to create a different sort of fault further on.


    This is really a job for a dual channel  oscilloscope and some suitable rated voltage dividers however, as the other problem is that the tester looks for falling L-N voltage to decide the RCD has tripped and once you start adding reservoir capacitance or external DC sources, the voltage may be held up from the load end,  and that  very simple 'has the power gone' detection is not to be relied upon any more.

    regards Mike
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