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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-
Nice, thanks.
Luminaires (light fittings)
Are 230 V light fittings permitted above a shower or bath (zone 1) in a room containing a >bath or shower?
Yes, 230 V fittings may be installed above a shower or bath but they must be at least IPX4, >i.e. enclosed and water protected. If installed more than 0.6 m from the edge of a shower >basin or bath (outside the zones) no special fitting is required but the luminaire must be of >a suitable design for the conditions.
So IP65 240V GU10 light fittings, which seem fairly common and not too expensive, would be absolutely fine. Then just swap out the halogens for 240V LEDs.
Although, since the bulb is held by clips on the faceplate, presumably if I could fit something like this, in place of the (almost identical) MR16 lampholder I could just wire it up with a T&E tail from the junction box.
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?