In my previous kitchen entry, I mentioned that the automation of the light switch was going to be a bit of a challenge, since chasing the walls was verboten.
The solution was to drill right through the wall. It's about a foot and a half thick, so I had to buy a metre long drill bit for el cheapo SDS drill. The bit cost more than the drill!
I was going to take an imposing picture of the drilling operation, but frankly, I was rather more concerned about where the bit was going to come through. After my careful measuring, I predicted that the bit would come out 10cm to the right of the central heating down pipes. the drill bit did the usual trick of drifting randomly as it navigated hard stone and soft lime mortar. This was not unexpected, so I was incredibly tentative in applying pressure. As you can see:
it emerged slightly off centre to the left of the pipes. Since this wall has not been redecorated (hence ghastly pink colour), and is actually going to be hacked around in rather a major way, there's no problem putting a chase in. I re-used the shallow box I dug out of the bedroom wall so that there'll be a bit of a clue that there's something in the wall after making good.
Fortunately, I had a degree of foresight when the kitchen was first-fixed during renovation and had a really deep box fitted. I think I might have been anticipating Marmitek modules at the time. In any case, the box is quite busy, 4 incoming mains cables, so a bit of space is needed to tuck them all:
You can see the pink cable emerging though the rear of the box. It is, of course, grommetted before fixing the module. The DRB-001 is installed instead of the original light switch, you can see that the orange logos compliment the wall quite nicely:
