On 09/03/2018 20:33, Tim Watts wrote:
On 09/03/18 19:24, ARW wrote:
On 09/03/2018 11:29, Tim Watts wrote:
On 09/03/18 05:42, SteveE wrote:

I think I'll take this approach as it will be as easy as just taking a
single earth wire down.


You could legitimately take a single earth to the nearest light on
the same circuit that does have an earth. For this, it would be
preferable to use a single insulated earth wire with green/yellow
insulation. Often called "singles" and available from all good
electrical wholesalers (some like TLC should be able to sell a length
rather than a reel).

I don't have the regs to hand so not 100% sure if a CPC (earth) in
this scenario *must* be insulated, but it shows the purpose clearly
which is worthwhile.


It's worse than that. It would have to be 4mm green/yellow

Is that coming from the same rules that govern the size of a lone earth
rod conductor (mechanical strength)?

And supplementary bonding

and follow the route/cable run of the live conductor unless that
circuit is RCD protected.

I wouldn't even know where to start looking that one up!

I am pretty sure that it is in one of my NICEIC snags and solutions
books. I'll take them to work today as I really will be doing nothing at
all when I get there apart from getting paid.


--
Adam