Using electrical equipment in bathrooms requires extra care to ensure safety. The IEE Wiring Regulations (17th Edition) have identified particular zones within the bathroom to indicate what type of electrical equipment can be installed.
Applies to inside the bath or shower. Here electrical products must be low voltage (a maximum of 12V) and be IPX7, i.e. can withstand total accidental immersion.
Applies to the area around the bath or shower up to a height of 2.25m above the floor and at a radius of 1.2m from the water outlet. A minimum rating of IPX4 is required. If the fitting is 240V, a 30mA residual current device (RCD) must also be used to protect the circuit in this zone, i.e. SELV with the transformer located beyond zone 2.
Applies to the area beyond Zones 0 and 1, 600mm horizontally and up to 2.25m vertically, including any recessed window with a sill next to the bath. This area requires electrical products to be IPX4 or better, or SELV with the transformer located beyond zone 2. It is advisable to consider the area around a wash-hand basin, within a 600mm radius of any tap as Zone 2.
Outside Zones (formally known as Zone 3)
These zones are anywhere outside Zones 0, 1 and 2 (subject to specific limits) and where no water jet is likely to be used. No IP rating is required here unless water jets are used for cleaning purposes in Zones 1, 2 and “Outside Zones”, in which case a minimum IPX5 must be used. The “safety” rating of the INTEGRA is IP44 and below is the excerpt from the INTEGRA installation instructions advising installers which zone is safe to position the window installation in rooms with a high level of humidity and with hidden wiring must comply with current national guidelines.
Do not install in Zone 0, 1, or 2 unless the top of the window is in Zone 3 (contact a qualified electrician if necessary).