Zone 0 is inside the bath or shower. Any fitting used in this zone must be low voltage, (max 12v) and be rated at least IP67 which is total immersion proof.
Zone 1 requires a minimum rating of IP45 but it is generally accepted that IP65 is to be used.
Zone 2 (60 cm width) an IP rating of at least IP44 is required.
Outside Zones are anywhere outside zones 0,1 and 2 there are no special IP requirements in this zone, however, we suggest to use a light with an IP rating of at least IP20.
This information should be used for guidance only. Always refer to the current IEE Wiring Regulations or a qualified electrician to ensure that you are guided by the latest codes of practice.