Bathroom Zones Explained 17th Edition 3

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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.

The new regulations in BS 7671 Part 701 pays special attention to special locations, and the zones in and around a bath or shower in a room.

These areas can be briefly explained, as can their effect on the type of safety measures for siting and wiring extractor fans in your bathroom or shower room.

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).

  • Only extractor fans that have SELV (12V) motors, or with ripple-free d.c. may be used as a measure against electric shock, the safety source being outside of zones 0, 1 and 2.
  • Other than current using equipment specifically designed for use in this zone, no switchgear or accessories are permitted.
  • Extractor fans designed for use in this zone must have protection to at least IPX7.
  • Only wiring associated with equipment in this zone may be installed..

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).

  • Other than switches and controls of extractor fans specifically designed for use in this zone, and cord operated switches, only SELV switches are permitted.
  • Extractor fans designed for use in this zone must be at least IPX4 , or IPX5, where water jets are likely to be used for cleaning purposes.
  • A 30 mA RCD must be provided to the electrical circuit.

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).

  • Other than switches and controls of extractor fans specifically designed for use in this zone, and cord operated switches, only SELV switches are permitted.
  • Extractor fans designed for use in this zone must be at least IPX4 , or IPX5, where water jets are likely to be used for cleaning purposes.
  • A 30 mA RCD must be provided to the electrical circuit.
  • For showers without basins there is no zone 2, just an extended zone 1..

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.

Zone Diagram for Bath Areas

Diagram of Bathroom & Showeroom Zones

Zone Diagram for Shower Areas

Diagram of Shower Zones
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