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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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    Hi Andy. In your examples, there is still no DC current.  DC may have some ripple as you say but the current direction never changes. A short after the half-wave rectifier does not produce a DC current, the AC waveform is still a current changing at the supply frequency. This will operate the transformer just fine, as the L-N currents are identical and the transformer is not saturated, because they should cancel exactly except for an Earth leakage fault (which we aim to detect). It could be that the short pulses of current produced by a rectifier-capacitor arrangement may not cause a trip, but this is a problem with the design/specification, not the device itself, and certainly, isn't DC. I am beginning to wonder if this is the problem that manufacturers are attempting to cover up because as I said, there seems to be no information on this "DC" problem.
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  • 0
    Hi Andy. In your examples, there is still no DC current.  DC may have some ripple as you say but the current direction never changes. A short after the half-wave rectifier does not produce a DC current, the AC waveform is still a current changing at the supply frequency. This will operate the transformer just fine, as the L-N currents are identical and the transformer is not saturated, because they should cancel exactly except for an Earth leakage fault (which we aim to detect). It could be that the short pulses of current produced by a rectifier-capacitor arrangement may not cause a trip, but this is a problem with the design/specification, not the device itself, and certainly, isn't DC. I am beginning to wonder if this is the problem that manufacturers are attempting to cover up because as I said, there seems to be no information on this "DC" problem.
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