Hi, I am adding a light into the loft and luckily for me, the existing upstairs switch is on the opposite side of the airing cupboard wall. For ease, I am thinking of running the switch cable (1mm) down through the airing cupboard ceiling and through the wall into the switch box. Are there any special considerations like size of cable (the only other cables in there are flex, this for temperatures?), securing to wall (clips or trunking) and the hole itself through the wall, does this need to be sealed or grommited?
Thanks!
Thanks!