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I am pretty sure the TN-S is original it is centrally located in the middle of Llandudno amongst lots of other homes. The RCD had a supplier seal on it which led me to believe it was their kit although with hindsight it is possibly an over zealous meter fitter who sealed it. I removed it as...

Thanks for the replies but most of you seem to have missed what I was asking, why is there a 100mA RCD fitted, seemingly by the supplier, on a TN-s system with a Ze of 0.40 Ohms ?

It has been removed, I was curious as to why it was there on a TN-S system

I wasn't

Supplier on TN-S (and thanks for actually reading what my question was lol)

I am more interested in why it was there in the first place to be honest, I will be replacing the consumer unit and bringing it up the spec soon with an RCBO board. I did test it on an auto test but due to the poor Zs reading my meter threw the towel in even on the 30mA x 1 test as it was...

Got a friend who called me saying his electrics keep tripping a few times per day, popped over and on the TN-S supply found a 80A 100mA RCD fitted by the supply authority after the meter and before the DP isolator. It was sealed like the meter etc hence my confidence it was SA fitted. It was...

We only arrange it for when there are no tourists around to keep it to ourselves ;)

It is more likely that have forgotten an awful lot and retained some of it. I have always maintained that in this work you learn something new almost every day and when I think I know something I still dig out the books to be sure :)

Hello folks, just a hello from me. Moved around the electrical and service industry for 40 years and now back where it all started as a self employed electrician and industrial controls engineer after leaving a toxic employer during that there covid shenanigans. Based in North Wales, renewed...