What would your take be? A 25mm three core (32mm dia) is run through a stud partition, so cable cannot be < 50mm from surface. Is SWA of the cable sufficient protection, or should additional armour be provided?
However, a cable of that size also warrents a little extra precaution in my opinion. From a safety point of view you have complied with the regs, but it would be a bitch if that cable was damaged by a nail or screw. Ideally it would be routed elsewhere, if it had to go in the wall then I would be looking to cap it with some galv trunk lid or similar.
But as I say, to comply, SWA directly inthe wall is fine, no matter what the size.
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