Advice on Meter tails in flat

[markyj06]

Thanks for the help rockingit

 

[Rockingit]

Thanks for the help rockingit

You're welcome, it's what the forum is for.

 

[Flanders]

Hi Just looking for some advice on meter tails in a flat.

The setup is 5 flats, i originally wired the meter tails in double insualted singles which was a mistake and am no in the process of rectifying it. Reasoning for calling it a mistake is the cable wont be rcd protected, for the majority of thier run they are in floor joists at a depth greater of 50mm but when they come up the wall to consumer unit they arn't. Reason for not rcd protecting is discrimination as if i put a 30ma RCD may be consumer unit that trips or Supply RCD which is in a service tunel. I could put a 100ma rcd but this wont comply as i understand as the cable are not buried at 50mm so either need mechanical protection or RCD. Hence i am now about to rewire in SWA. My question is i have already put in 16mm earth as well, so was planning on getting 2 core SWA and running this is to save wasting the 16mm earth. But just wanted to check i havent missed something i cant see why i cant leave the earth in place and use 2 core SWA for the supply?

Any replies would be great,

Thanks

Mark

Just for you information you can not normally run double insulated tails over long runs anyway even if they are RCD protected the DNO wont allow it, But good on you for admitting your mistake and sorting it out

 

[Risteard]

Yeah, I use 8 loads myself, it's so easy to get hold of after all.

Beat me to it

 

[Paulgwat]

Hi Just looking for some advice on meter tails in a flat.

Reason for not rcd protecting is discrimination as if i put a 30ma RCD may be consumer unit that trips or Supply RCD which is in a service tunel. I could put a 100ma rcd but this wont comply as i understand as the cable are not buried at 50mm so either need mechanical protection or RCD.

I may have missed something here but wouldn't you need to discriminate in terms of time and not current? i.e. both upstream and downstream RCD's are 30ma but one is 30ms and the other 100ms.

That would minimise the likelihood of nuisance tripping of the upstream device should something happen in a flat but would also offer compliant protection of the cables without needing to go to SWA.

Again apologies if i have missed something obvious here, would be interested to know if this approach doesn't work as this is what was implemented and signed off for two remote distribution boards in my house / outbuildings

Cheers

Paul

 

[UKMeterman]

Hi,
It could be the case there has been someone messing, there should be a fuse somewhere. I do know of a few flats where there is a remote ryefield box. In this instance give the DNO a call.