Bathroom & Shower Room zones explained.
Because of the increased risk of death or injuries from electric shock, a room containing a bath or shower is considered a special location and is now outlined in the new 17th edition IEE Wiring Regulations, amendment 3.
Fitting & Wiring Extractor Fans in Zone 0
This is the interior of the bath tub or shower basin or, in the case of a shower area without a tray, it is the space having a depth of 100mm above the floor out to a radius of 600mm from the fixed water outlet of 1200mm radius for an extended zone 1 (please see below diagram).
Fitting & Wiring Extractor Fans in Zone 1
This extends above zone 0 and around the perimeter of the bath or shower basin to 2.25m above the floor level, and included any space below the bath or basin that is accessible without the use of a key or tool. For showers without basins, zone 1 extends out to a radius of 600mm from the fitted water outlet or 1200mm radius for an extended zone 1. (Please see below diagram).
Fitting & Wiring Extractor Fans in Zone 2
This extends 600mm beyond zone 1 and to a height of 2.25 m above floor level (please see below diagram).
The extent of the zones in a bath or shower room can be limited by floors, ceilings and walls. For more detailed information see BS 7671 diagrams 701.1 & 701.2. Any electrical equipment installed on the surface of floors, ceilings and walls that limit a zone is subject to the requirements of that zone.
Please note that this guide is only to be used as general reference. Please ensure that you are fully aware that any electrical and installation work must be carried out in accordance with IEE Wiring Regulations, The Building Regulations and any further compliancy that might be required. If in any doubt, consult professional help from a qualified individual or company.
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