bare wire in wall

[swidders]

as long as the wall is wider than 50mm

How many jobs have you chased out 50mm for switch/socket drops? Bearing in mind you can't chase more than 1/3 of the total thickness, and it obviously still has to be 50mm from the other side. That 50mm thing is a ridiculous suggestion don't even know why it got put into the 17th

Stud walls made from 100mm by 50mm timber?
Bricks 100 mm thick - so 30mm chase into brick plus 20mm boarding/dot/skim?

 

[ColJack]

cavity walls chased deep enough...

walls boarded with 50mm foam backed plasterboard..

any number of reasons..

I'm putting a 2x3 stud wall against my wall in the kitchen to hide central heating pipes, and gas pipes.. cables will be clipped to the wall so they're more than 50mm from the surface..

 

[ban-all-sheds]

I'll be doing the same fairly soon...