Bathroom Zones Explained

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Bathroom & Shower Room zones explained...

Because of the increased risk of electric shock, a room containing a bath or shower is now considered a special location as outlined in the new 17th edition IEE Wiring Regulations.

The new regulations pay special attention to the zones in and around a bath or shower in the room.

These areas can be briefly explained, as can their effect on the type of extractor fans which can be used.

Zone 0

  • Zone 0 for a bathroom is the area inside the bath.
  • Zone 0 for a shower room is the area inside the shower basin. If there is no shower basin, zone 0 is 10cm high from the finished floor level and extends to 1.2m around the fixed shower head.
  • It is not practical to mount extractor fans in zone 0.

Zone 1

  • Zone 1 for a bathroom is the same width as zone 0 (the width of the bath) extending to 2.25m above the finished floor level.
  • Zone 1 for a shower room is 2.25m from the finished floor level or the height of the fixed shower head from the finished floor level if more than 2.25m, and the width of the shower basin. If the shower has no basin then zone 1 extends to 1.2m around the fixed shower head.
  • Zone 1 does not include zone 0.
  • The space under the bath tub or shower basin is considered to be zone 1. However, if the space under the bath or shower basin is only accessible with a tool, it is considered to be outside the zones.
  • Extractor fans installed within zone 1 must be at least IPX4.
  • Extractor fans installed within zone 1 must be fitted with 12v SELV motors with the SELV transformers and isolators fitted outside of zone 0, 1 & 2.

Zone 2

  • Zone 2 for a bathroom is the same height as zone 1 (2.25m) extended to 0.6m around the bath.
  • Zone 2 for a shower room is the same height as zone 1 extended to 0.6m around the shower basin. If there is no shower basin zone 2 is replaced by zone 1 extended to 1.2m around the fixed shower head.
  • Extractor fans installed within zone 2 must be at least IPX4.
  • Extractor fans installed within zone 2 must be fitted with 12v SELV motors with the SELV transformers and isolators fitted outside of zone 0, 1 & 2.

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.

RCDs are required for all circuits in locations that contain a bath or shower. The requirements for local supplementary bonding have been relaxed if certain conditions are met.

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.

Zone Diagram for Bath Areas

Diagram of Bathroom Zones

Zone Diagram for Shower Areas

Diagram of Shower Zones
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