
can of wormsRather silly having 2 30mA RCDs in circuit!

True, but do you really believe that there is a significant chance that there aren't connections inside the plate?However, rather like the infamous shower with the pull cord switch above it and the cable clipped direct, it could be compliant if there are no connections inside the plate and the heating element is suitably IP rated.
That seems mighty close to 'brinkmanship', but I suppose you are right! Parts of the towel rail clearly are in Zone 1, but that,of course, is OK if the manufacturer says it's OK for Zone 1.If the tiles are at least as thick as the outlet plate, isn't it in Zone 2?
That's what I assumed. However, as BAS has pointed out, if you can argue (because of the depth of the tiles+cement) that the plate is beyond the end of the bath, then it would be in Zone 2, and hence compliant with the regs. Connections (but not switches or sockets) are allowed in Zone 2. Whether or not the towel rail itself (at least some of which is certainly in Zone 1) is compliant depends on whether the manufacturer says that it is suitable for use in Zone 1.There are connections in the plate.
No - I don't understand why Zone 1 does not extend horizontally.I'm not actually sure I understand the 'spirit of' (i.e. thinking behind) the position of the Zone 1/2 boundary - do you?
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