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2.
The shower unit must be earthed by connecting the supply cable
earth conductor to the earth terminal.
Supplementary bonding: Within the bathroom or shower room,
all accessible conductive parts of electrical equipment and
extraneous conductive parts that are likely to introduce earth
potential, must be electrically bonded to earth using a minimum
cable size of 4.0 mm
2
(2.5 mm
3.
Power supply cable must have a minimum cross sectional area
of 1 mm².
4.
Power supply must be 230–240 V at 50 Hz. The isolating switch
must be double pole switched, fused at 3 Amps, with at least a
3 mm contact separation gap to each pole.
5.
Do not turn the electrical supply on until all plumbing connections
have been made and the shower unit has been commissioned as
the unit must not be operated dry.
6.
A 30 mA RCD (residual current device) must be fitted. This may
be part of the consumer unit or a separate unit.
7.
Fuses do not give personal protection against electric shock.
Plumbing
1.
The plumbing installation must comply with the requirements of
UK Water Regulations/Bylaws (Scotland), Building Regulations
or any particular regulations and practices, specified by the local
water company or water undertakers. The installation should be
carried out by a plumber or contractor who is registered with, or is
a member of an association such as:
Institute of Plumbing (IOP), throughout the UK.
National Association of Plumbing, Heating and Mechanical
Services Contractors (NAPH & MSC), England and Wales.
Scottish and Northern Ireland Plumbing Employers' Federation
(SNIPEF), Scotland and Northern Ireland.
2.
A minimum storage capacity of cold water of 230 litres (50 gallons)
is required to provide adequate showering time. Insufficient storage
may result in the pump being run dry.
3.
Layout and sizing of pipework must be such that nominally equal
inlet supply pressures are achieved and the effects on the shower
performance of other draw-offs are minimised. Ensure the shower
unit is the first draw-off from the water supply.
2
if the cable is not mechanically protected
if mechanically protected).
11
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