Obviously also on an EICR if the RCD then doesn't operate with it all on it becomes a C2 ?
aligarjon:
OK Thanks. How do we feel about additions and leaving the installation less safe than we found it by fitting LED or induction hobs then ?
Not sure how extra circuits help either if they are all on same rcd.
I don't think that nuisance tripping is unsafe. Extra circuits help if they are separately protected - i.e. loads of RCBOs.
Ooh, how I love my 15th Edn installation with a couple of SRCDs and no more. ?
sparkiemike:
The NAPIT book "ECIR Codebreakers" takes a different view and gives a C2 for the following description.... "RCD fitted is type AC and has pulsating DC currents present from connected equipment such as EV, PV, switch mode power supplies (SMPS), domestic appliances with VSDs, etc. which may/will mask fault current and prevent the type AC RCD from operating"
It isn't just a matter of masking. I have a VSD which simply does not work with a type AC RCD (in a socket) - the moment I press the start button, it trips. That doesn't justify a code.
Are we sure that these devices mask the RCD?
My understanding is that type AC RCDs will trip on a pulsating AC fault current, but they may not trip on a pulsating DC fault current? Type A RCDs should trip in the event of either occurring.
How could the code for the presence of a type AC RCD be worse than the one for none at all? ?
It isn't just a matter of masking. I have a VSD which simply does not work with a type AC RCD (in a socket) - the moment I press the start button, it trips. That doesn't justify a code.
Are we sure that these devices mask the RCD?
My understanding is that type AC RCDs will trip on a pulsating AC fault current, but they may not trip on a pulsating DC fault current? Type A RCDs should trip in the event of either occurring.
How could the code for the presence of a type AC RCD be worse than the one for none at all? ?
I would not look at it in isolation, other factors would be considered, so could be C2 or C3
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