Thank you.
My sparkie friend has confirmed that the Ze readings are good for a TN-S system but he
doesn't know whether having a 100ma type-s RCD protecting the entirity of a non-TT system where it
wouldn't be required was compliant.
All that we needed to know is whether it would be
mandatory to replace the main incomer RCD with a 100A plain old switch or not. If it is, we'll get the DNO to pull the service fuse and we'll replace it. If not, we won't.
I hope someone is able to clarify the situation.
Thanks in advance and apologies for not making this clear in my OP.
If it helps I do understand the frustration a lot of sparks have with their having had to pay an inordinate amount of money to get qualified and what might appear to be a jumped up know-it-all DIYer "get away with doing it without paying for quals". I'd be frustrated, too.
But hey, I work in an IT Support environment. I have to support people all day and all night on a 24/7 shift rotation who haven't got a freakin' clue what their on about and the number of people I'd like to say "ok well while you figure out how to click OK I'll just go slit my wirsts" to... well, I've lost count. But we've got to sit there and be patient and kind. Can you imagine what it would be like talking auntie Moe through a CU change? Pulling teeth? Yeah. Same as having to walk a SME through installing an SDSL router over the phone.
Anyway. Enough of the animosity, any help that can be offered is greatly appreciated