Earthing

[Adebambo Adeoye]

Hi Forum,

Need some advice.

I am upgrading a consumer unit in a block of flats. The Existing main earthing is by an Old conduit containment previously used to contain the old 6mm submains cables that has now been decomissioned. I need some advice as to where i stand in complying with the regs when i upgrade the old cu to a dual RCD CU. Its almost impossible to employ a TT system because the flat is on the 6th Floor.

Many thanks

Add

 

[Engineer54]

What do you mean by ...''decommissioned''?? Ripped out, or just not used anymore??

 

[Adebambo Adeoye]

Many thanks.

Its been disconnected and replaced with new sub mains cabling

 

[Engineer54]

Are you saying, that this new sub-main cabling didn't include suitably sized earthing conductors??? How come??

 

[Adebambo Adeoye]

The installation is an old one. Over the years it appears that the old cables that appears to be 6mm cabling was upgrade to !0mm. In my earlier thread i was just trying to explain what the size of the old cabling was. The 6mm cables is not used ( has been disconnected but still on the conduit that is used as the means of earthing.
Sorry for the confusion.

 

[Engineer54]

So the conduit is still in place then, what size is it, and have you tested your Zdb(Zs) at the flat CU??

 

[ackbarthestar]

I agree, there is a lack of information here to make a prognosis

An aside ... Where do all the 'likes' disappear to? This is the first opportunity to show my appreciation the last post