50mm deep - Page 2 - Electricians Forum | Electrical Forum | An electrical forum for electricians in the UK

mike · 29-02-2008

is there such a thing as a s type 30ma rcd if so would this acheive discrimination with a standard 30ma rcd. if so i suppose this could be used on a split board. dont fancy chasing all cables 50mm deep

Grae79 · 29-02-2008

don't believe u can get 30mA S type RCD's

29-02-2008

S type RCD's start at 100mA appendix 3 of the 17th regs

DadofTwo · 01-03-2008

Quote:

Originally Posted by cirrus

Until June you don't have to do anything but when the 17th comes in then, you gotta do it.

It doesn't have to be applied retrospectively does it? Basically, after June, if you go to do a job in a house and the cables of the existing wiring are buried less than 50mm (which of course they will be less) then do you need to RCD / RCBO protect that circuit even if you've not worked on that particular circuit?

I hope not! Can you imagine the problems that would cause!!!

01-03-2008

A 30mA s type would not trip within the required time, so would not comply

And the 17th is out now - you can use either.

And retrospective???? YES!!!!!

rather an answer here, i will start a new post, it will be of interest to a lot of people, i think. i will title it Retrospective application of the 17th edition