Board change with no cpc on lighting

[Paul117]

Hi all

Been asked to quote for a board change. Had a quick look round the place and discovered lighting circuit has no earth. Where do I stand on this?

Current board is 3036s and will be replacing with rcbos as wiring is quite old. Will also be bonding the gas and water from 4mm to 10mm.

 

[Geoffsd]

If you are referring to page 6 then you have ignored some of the advice and seriously misunderstood the rest.

 

[Edd]

http://www.esc.org.uk/fileadmin/user_upload/documents/industry/best_practice/BPG1v2_web.pdf

Thanks, I have a hard copy of that, but Where does it say

"actually allows you to fit a new consumer unit even with metal unearthed fittings"

Going to have another read through it now...

 

[Edd]

Found it Page 9 second row up.

 

[Welchyboy1]

In the chart the part that says lights with no cpc in other areas

 

[Geoffsd]

You have misunderstood page 9 as well.

 

[Welchyboy1]

If you are referring to page 6 then you have ignored some of the advice and seriously misunderstood the rest.

Would you like to explain it then ?

 

[Geoffsd]

Firstly - misunderstanding page 6 does not apply as that is not what was being referred to.

And I owe the OP an apology as, rereading, he seems to disagree with the advice on page 9 as well.

It is very poor advice as is usual in these guides.
What difference does IR >1MΩ make to the danger of unearthed exposed-conductive-parts.

In any case fitting a new CU will make the installation safer either way.

 

[Welchyboy1]

What difference does IR >1MΩ make to the danger of unearthed exposed-conductive-parts.

It's obviously to unsure there's no fault on the light fitting at the time of testing and no chance of an earth path if any future fault developed

I think this deals with real world
Situations quite well actually and is a pretty sensible guide

In practice you would obviously try to earth all fittings or replace with class 2 but as I last resort I think this is acceptable

As said before the installation would be a damn sight safer with a new cu rcds and main bonding rather than an old wylex

I still don't understand how I have seriously misunderstood this guide??