Volex flat plate sockets/switches
I read the fitting instuctions from the site and they do state boxes
must be mounted 5mm below the wall surface.
Less of a problem with tiled walls, as you don't typically install the boxes
anywhere near the surface of the tiles. If anything, they generally only
protrude from the plaster a couple of mm if at all, leaving a good 10mm or
so to the tile surface.
Christian.
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