Well, in the country anyways.....
This talk of RCDs etc has gotten me thinking......
A friend has a small holding which for many years had a 100A servicehead which then fed a c core buried cable (100 metres or so) which then fed a small old wylex board (one of the ones which can have plug in MCB where wired fuses used to sit)
At some time over the past few years somebody (supply Co?) has fitted a 100mA RCD near the service head (Wylex board remains unchanged). I don't know if this a time delayed type, but perhaps there would be no point in time delayed if (as at present) there is no RCDs downstream, or if it is time delayed, but it just doesn't show as there is no RCDs downstream (actually, that's not always true, I have used a plug in RCD downstream, and found both RCDs go off).
Still with me??
This resulted in a lot of tripping, such that he A, Got a new "cooker (Oven and two sealed rings) cooker, and also removed his electric shower altogether. He still gets nuicance trips and as the facilities are occasionally used for things like parties in marquees when he is not on the premises he quite often has to talk peoople through finding where the RCD is and resetting it, etc.
Would there be any benefit (in terms of reducing the number of whole installation nuisance trips) in replacing the Wylex with a 17th edition board, or is it likely the RCD at the service head would also still trip as well as one or more of the 30mA jobbies in the Wylex replacement?
Is it likely that the 100mA jobbie could be upped to say 300mA and would that have an effect?
I wouldn't consider doing this work myself, but would like to offer him an informed opinion.
TIA
Chris