Which reg says that?
MDF, or other combustible material, is allowed 'in the backbox area'. What isn't allowed is for the 'back box' to actually be made out of a combustible material. In other words, there has to be something (like a back box) deemed not to be 'combustible' between live parts and anything which is combustible.
Indeed. Anything (like a light fitting, junction box or whatever) that itself satisfactory 'encloses' the live parts can be attached to anything (within reason), including combustible things.
That needs qualifying as many light fittings are not safe if fixed to a combustible surface because the casing gets hot (dependent on the type and rating of lamp fitted). I've converted four uplighters in our lounge to LED (14W R7s, dimable) instead of the 120W lamps they originally had in (yup, reduction from 480W
to 56W) - based on how hot they had obviously been, and while screwed to the block/plastered wall as a heatsink, I'd not have liked to see them mounted on wood.I agree that it doesn't sound/feel very nice but, in reality, the temperature required to ignite wood is way above the melting point of, say, PVC - so if there were a real risk of attached wood catching on fire, I think one would have more rapidly-presenting problems to worry about.That needs qualifying as many light fittings are not safe if fixed to a combustible surface because the casing gets hot (dependent on the type and rating of lamp fitted). I've converted four uplighters in our lounge to LED (14W R7s, dimable) instead of the 120W lamps they originally had in (yup, reduction from 480W
