Hi all

I have been considering how to satisfy 17th Edition wrt cooker cable.
As I see it there are three options:
1 Fit RCBO in place of MCB for cooker feed
2 Use earthed steel conduit protection
3 Bury cable 50mm below wall surface.

That got me to thinking about the stability of the wall if option 3 is used.
Allowing for plaster covering, but also the cable thickness means you will
be chasing to a depth of half the inner leaf thickness.
Also, with cable coming from above, the chase will extend 1/2 to 3/4 the
height of one storey.

So, the question is, is option 3 above actually directed at modern domestic
installations where the inner leaf is only 100mm thick?
In the case of my kitchen, the inner blocks actually have an insulation
filled cavity "within" the block itself. So the effect of chasing to 50mm
depth (and into this cavity) is even more damaging.

Phil