Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

(iii) controls and switches of water heaters and shower pumps
which comply with the relevant requirements of appropriate
recognised standards;
(iv) switches supplied by SELV at a nominal voltage not exceeding
12 V r.m.s. a.c. or d.c.;
(v) a shaver supply unit complying with subparagraph (e) below.
(e) In a room containing a fixed bath or shower, provision for the
connection of an electric shaver, toothbrush or similar light current
appliance can be by means of a shaver supply unit complying with
BS EN 61558-2-5 or such a unit incorporated in a luminaire. The
earthing terminal of the shaver supply unit should be connected to
the protective conductor of the final circuit from which the supply is
derived.
(f ) Surface wiring systems should not employ metallic conduit or
metallic trunking or an exposed metallic cable sheath or an exposed
earthing or bonding conductor.
(g) Lampholders within a distance of 2.5 metres from the bath or
shower cubicle should be constructed of or shrouded in an insulating
material.
(h) No stationary equipment having heating elements which can be
touched should be installed within reach of a person using the bath
or shower.
(i) No electrical installation or equipment should be installed in the
interior of a bath tub or shower basin.
(j ) In a room containing a fixed bath or shower, the provision of socket
outlets should comply with IEC 60364-7-701 and be installed
beyond Zone 2* (i.e. 0.6m away from shower basin or bath tub)
and the socket outlets should be protected by an RCD with a
residual operating current not exceeding 30mA. When a circuit
designer who is a Registered Electrical Worker for Grade A, B or C
considers it appropriate for the situations under consideration,
additional safety measures may be used. These measures include the
use of a dedicated circuit or a dedicated circuit protected by an
isolating transformer.
* Zone dimensions in bathrooms should be referred to Figure
26(1)(a) and 26(1)(b)
(4) Air-conditioners and space heaters
(a) Fixed air-conditioners and space heaters should be fed by separate
radial final circuits controlled by a fuse or miniature circuit breaker at
the distribution board.
172