Received by e-mail:
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?