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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
    I will try that Chris. In the first place, VSDs have significant mains filters. The capacitors in these put an asymmetric current on live and neutral as they suddenly charge at anywhere that is not a mains zero crossing, between the live conductors and Earth. The second is that large inrush currents to the electronics also give the RCD transformer problems in balance for a very short period (remember what I said about transformer balance at high frequencies above) and can cause tripping. I have a VSD on my lathe (4kW) and this has so far been fine, but my compressor sometimes does cause a trip on starting. RCDs are not ideal for "bad" loads, and I have been doing some useful experimental work, which will hopefully lead to a technical paper/article sometime. The cure is to fit zero voltage switching to these loads, but it's not cheap. You could also switch your VSD on via a current limit resistor, which you short out after a period, to limit the inrush current. 10 to 20 Ohms will probably work well.
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  • 0
    I will try that Chris. In the first place, VSDs have significant mains filters. The capacitors in these put an asymmetric current on live and neutral as they suddenly charge at anywhere that is not a mains zero crossing, between the live conductors and Earth. The second is that large inrush currents to the electronics also give the RCD transformer problems in balance for a very short period (remember what I said about transformer balance at high frequencies above) and can cause tripping. I have a VSD on my lathe (4kW) and this has so far been fine, but my compressor sometimes does cause a trip on starting. RCDs are not ideal for "bad" loads, and I have been doing some useful experimental work, which will hopefully lead to a technical paper/article sometime. The cure is to fit zero voltage switching to these loads, but it's not cheap. You could also switch your VSD on via a current limit resistor, which you short out after a period, to limit the inrush current. 10 to 20 Ohms will probably work well.
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