Heyo, having a new downstairs washroom, sink, basin, boiler and elec towel rail. The electrician tells me that under the latest IEE 17th ed regs its OK to have the switch for the towel rail inside the washroom in the zone 2 area, as there's no steam from a bath or shower - is this correct ? I always thought it had to be outside of the room. The washroom will be on its own isolator with separate mini consumer unit with rcd and otherwise complies with the 17th, having an isolator above the door on the outside etc. Thanks guys.