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I came across your name while searching the net for specific answers to some questions regarding the IEE WiringRules about bathrooms.

The contents of section 601-07-01 do apply to wiring systems embedded in the walls at a depth of 50mm or less. I have not seen any definition of a wall applicable in this context. Do they mean any partition within the bathroom only or do they mean also any wall between the bathroom and any adjacent room?

I would take this to include all walls, be they exterior, a wall between the bathroom and an adjacent room, or a partition within the bathroom (e.g. surrounding an airing cupboard).

Any other opinions?