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nearly there: http://electrical.theiet.org/wiring-matters/53/section-701/index.cfm
If Z1, then (max) 30mA RCD protection for all electrical equipment required
IPx4 for equipment not subjected to jets of water
IPx5 for equipment subjected to jets of water
rive_gauche
@ffm
IP65 rated Aurora fittings, with this type of lampholder wired to a 12V 20w-50w ENLIGHT transformer.
I'd go 240V GU10 in the bathroom if I could, but I'm really unclear whether you can have mains voltage lighting directly above a bath. Our ceiling is not very high, so it falls into zone 1. Some sources seem to suggest that you can use mains voltage lighting in zone 1 as long as it's IPX5 rated; others suggest that it has to be 12V. Anyone know exactly what the requirements are?