On 28/05/2019 08:20, PeterC wrote:
On Mon, 27 May 2019 16:42:40 +0100, ARW wrote:

On 27/05/2019 16:06, Fredxx wrote:
On 27/05/2019 15:59, ARW wrote:
On 27/05/2019 15:44, Tricky Dicky wrote:
A length of steel conduit with the ends made off properly is also fine.

Even if it is buried below the plaster?


Yes.

I thought protection had to be more than 3mm of steel and steel conduit
is only 1.6mm

When you say the ends are made properly, do you mean the conduit is
earthed?


There is actually no specification for the thickness of the steel other
than "3mm is deemed to be adequate".

1.6mm earthed steel conduit will pass.

The NICEIC seem happy for you to just use steel conduit (as long as you
are paying them your subs).

I have always found it easy enough to sink the cables 50mm deep.

I considered chasing in some runs, just for neatness*, but how the hell do
you get 50mm from both sides of a 100mm wall? The cable would always be a
bit off-centre and it's more than 0mm thick.
Where the cables are in the wall (historic routes) they're steel capped but
only the thin steel - just enough for a bit of a warning - and open at the
back.

Capping is only there to protect it from the plasterer.
It can be plastic.

The internal walls are also hollow block - too much cutting...!

*I actually prefer surface trunking - I like to be able to get at cables and
pipes.