On 23/02/2021 20:25, Fredxx wrote:
On 23/02/2021 19:35, Tricky Dicky wrote:
On Tuesday, 23 February 2021 at 19:06:15 UTC, undefined wrote:
After serious thinking Chris Green wrote :
I know it's a tall order but still I may as well ask...

Is there any clever way of getting a cable through a hidden stud
behind plasterboard? I want to feed a lamp from a switch mounted
on an internal dry-lined wall but unfortunately there's one piece
of timber between the switch and the light.

It's a very low current requirement, 3.5 watts at 240 volts so
something like 15mA.
If it's near the ceiling, you can drill through, but other than
that...

You need to make a hole in the PB, over the level of the stud, get
the cable through, then fill the hole.

If it is a stud you are trying to pass cable through then you little
option but to cut out a small section of plasterboard across the
stud. You can then either notch the stud or drill though it to pass
the cable. You then need to cover the cable notch with one of these;

https://www.screwfix.com/p/sabrefix-...-20-pack/30038


That's very expensive for a plate that is just 1mm thick.Â* I thought
mechanical protection outside a safe-zone needed to be 3mm?

If the cable run is horizontal or vertical from the fitting or switch
then it is automatically in the safe-zone and only needs RCD protection.

For the sake of one additional cable in a house full of existing
non-protected cables, would you really bother in your own home though?
Especially where adding an RCD might mean changing the whole CU.

The requirements for RCD or mechanical protection, in a older house,
only really make sense for sizeable work, where it may make a
significant difference to safety, not for adding trivially to an
existing installation.

Although I am planning to replace my lighting MCBs with RCBOs at some
point in the near future, as replacements that fit my CU have become
available recently (the previous versions would not physically fit).