Hello -
I'm about to install a 150W PIR security light on the upstairs ring main, and I'm wondering what best practice is.
There's a single 13A socket in a convenient location with an apparently secure steel backbox., but I'm concerned that if I try to drill a big hole in the back of the backbox, it may become loose, generating more work, and I'd lose a socket anyway.
What I'm thinking of doing is bringing the socket forward a bit by installing a shallow surface box on top of the backbox, then running a short piece of 2.5mm cable sideways across the surface to new surface box containing the fused/switched connection unit, with a length of 1mm cable running though the wall from the new surface box. Does this violate any regulations or good practice?