As far as electrical installations are concerned, bathrooms are considered to be a ‘special location’ due to the proximity of water which increases the risk of electric shock for users. Electrical products commonly found in bathrooms include lighting, showers, fans, heaters, shades sockets and heated towel rails.
Bathroom zones explained:
Zone 0 represents the interior of the bath tub or shower basin.
Minimum IP 68 LOW VOLT 12v
Zone 1 is the area around the bath tub or shower basin up to a height of 2.25m above the floor and at a radius of 1.2m from the water outlet.
Minimum IP 55
Zone 2 is limited by the vertical planes external to zone 1 and parallel vertical plane(s) 0.60m external to zone 1.
Minimum IP 44
Outside Zone is limited to the vertical plane(s) external to zone 2 and the parallel vertical plane(s) 2.40m external to zone 2.
Minimum IP 20
Usually in Zone 3, you can place any lights you like.
Each of these bathroom zones has specific requirements regarding the electrical equipment or lighting that can be sited within that zone