Question

Is it permitted for a wall-mounted switch to be installed in a bathroom?

Answer

A wall-mounted switch may be installed in a bathroom. Historically, installers have made use of a pull-cord switch to control lighting in a bathroom. However, whilst Regulation 701.512.3 of BS 7671 does not permit wall-mounted switches to be installed in zones 0, 1 or 2, it does not preclude a wall-mounted switch being installed outside of these zones. Regulation 512.2.1 does, however, require that due account be taken of external influences.

In particular, the electrical installation designer will need to be satisfied that a wall-mounted switch has the appropriate degree of protection from water ingress for installation in a bathroom.  Where water jets are likely to be used, such as might occur in a communal shower area, Regulation 701.512.2 requires that electrical equipment has an International Protection (IP) rating of IPX5. In a bathroom where water jets are not likely to be used, such as in a dwelling, the designer will have to choose a wall-mounted switch having an IP rating relevant for the level of risk of water ingress.

Alternatively, the designer may specify that a pull-cord switch complying with BS 3676 or BS EN 60669-1 with an IP rating suitable for its location is installed.  The pull-cord switch body must be installed outside of zones 1 and 2; however, the insulated cord may enter either zone.

Standard applied

BS 7671 • BS 3676 • BS EN 60669-1

Regulations referred to

512.2.1, 701.512.2, 701.512.3.