For installation guidance the bathroom is split into zones.
The IP rating of the light dictates in which zone it may be fitted.
Zone 0 Within the Bath or Shower
Inside a bathing area of a bath, lights are sometimes used to illuminate whirlpool baths and spas. All fittings should be 12 volt and there should be a safety source such as a cut-out switch which should be fitted outside these zones.
Zone 1 Above the bath to a height of 2.25 metres.
IP65 (jetproof) down to IP44 (splashproof).
Where there is no showerhead or rail over the bath, IP44 (splashproof) should be safe enough, although a fitting should never be touched with wet hands. Inside a shower or bath area, where there is a shower head or demountable shower hand-set, fittings should be IP65 (jetproof) or more.
Zone 2 0.6m outside the bath or shower and above bath if over 2.25m.
If there is no danger of a direct jetspray being accidentally applied to the fitting, IP44 (splashproof) or greater is required in this area./span>
Zone 3 Anywhere outside zones 1 & 2 where no water jet is used. As long as there is no possibility that any lighting will be splashed with water, or that steam will settle on the fitting, IP44 or IP65 fittings are not needed.
Wash basins currently have no specific regulations. Good advice is to treat the 0.6m area around the basin as Zone 2.
In areas of high humidity, such as saunas and steam rooms, a luminaire should be at least IP65.
This information is intended as a guide only. See IEE Wiring Regulations (16th Edition) for full details. Andrew Orange takes no responsibility for incorrectly installed luminaries.
All fittings should be installed by a qualified electrician.