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SECTION THREE
Electrical Installation
WARNING:
THIS APPLIANCE MUST BE EARTHED
The electrical installation should be carried
out in accordance with the lEE Wiring
Regulations.
The following notes are for guidance only:
3.1 The shower heater must only be
connected to a 230/240V ac supply. If you
are either:
a)
installing a
1
0.8kW shower or
b)
installing the shower in a rural location
it is a good idea to advise the Regional
Electricity Company.
Please note that if a cable is operated at or
near its maximum rating for a given
installation method, it may feel very warm.
This is normal and will not result in
deterioration of the cable insulation.
80 A or
Meter
~~~~~
100A main
Is
switch
~~=~~
Consumer
unit
Meter 'tails'
Figure 3.3
Schematic diagram of
straightforward installation circuit
Pull-cord
switch
Shower
Heater
3.2 Before making any electrical
connections within the installation,
make sure that no terminal is live.
If in doubt, switch off the whole installation at
the consumer unit or switch fuse (where fitted).
3.3
The shower heater must be connected
to its own independent electrical circuit. It
MUST NOT
be connected to a ring main,
spur, socket outlet. or lighting circuit,
otherwise the circuit will overheat.
3.4
Check that your consumer unit (main
fuse box):
(i)
has a main switch rating of 80A or
above and
(ii)
has a spare fuse way which will take
the fuse/mcb you need to fit
Figs.
3.9 and 3.10).
If so, you can wire the shower direct to the
spare fuseway of your consumer unit (See.
Fig. 3.3). NB Not all consumer units accept
a 35/40/45A sized fuse.
3.5
If 3.4 (i) or (ii) are not so, the installation
is not straightforward, since it could involve
installing a new consumer unit to serve the
whole house or just the shower. You will
need to call in your Regional Electricity
Company to check the circuit and make the
connections to the meter or service
connector block. They will also check the
bonding of items in the bathroom.
3.6
All exposed metallic parts in the
bathroom must be bonded together using
cable of at least 4mm2 CSA (cross sectional
area). These parts include metal baths,
radiators, water pipes (including the feed to
the shower), taps and waste fittings.
3.7
For all installation arrangements work
back from the shower to the consumer unit.
Before making the final connections, check
the circuit for continuity and insulation
resistance.
3.8
It is recommended that a residual
current device (rcd), formerly known as an
earth leakage circuit breaker (elcb), with a
tripping current of 30mA, is incorporated in
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