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t26d.txt
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1998-10-14
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Summary
This task gives information about how to fit an electrical
shower unit. There are many types of shower unit available
and it is recommended that you follow individual
manufacturers' instructions as well as the following steps:
1 Safety first
2 Seeking professional help or advice
3 Selecting the power requirements of your
shower
4 Common safety features
5 Arranging an adequate power supply
6 Electrical supply - cable specifications
7 Installing electrical cables to your shower
8 Terminating the electrical cables
9 Connecting to the Consumer Unit
10 Safety! Supplementary earth bonding
Tools
Pliers, side cutters, lump hammer, screwdrivers,
bolster chisel, multi-meter
Materials
Consumer unit with 30mA rcd and a spare way
for a 32A or 40A mcb, double pole pull-switch
Step 1 - Safety first
Never work on any part of the electrical installation
without first switching off the supply at the consumer
unit and, where possible, removing the circuit fuse.
Always unplug any electrical appliance before doing
any work on it. Check all connections are secure and
all covers have been replaced before you turn the
electricity on again.
Step 2 - Seeking professional help or advice
If you donÆt feel competent to do a particular job,
always seek the advice of a professional electrician.
Make sure that any person you hire is fully qualified.
A person registered with the Electrical Contractors
Association/ NICEIC, will be approved for undertaking
this type of work and will be well versed in all the
wiring regulations for electrical installations in
buildings.
Step 3 - Selecting the power requirements of your shower
Please refer to the table in the package for the representation of
the range of available electric shower units. It indicates the
corresponding size of protective device and appropriate cable
cross sections.
Step 4 - Common safety features
If the shower unit is protected by a rewirable fuse, the
requirement for larger cable sizes will add extra cost
and there may be some difficulty in connecting such large
cables into the unit. The mcb is the preferred over-current
protective device for these circuits. For protection
against earth leakage currents these circuits also require
a 30mA residual current device, (rcd).
Step 5 - Arranging an adequate power supply
The circuit protective device will depend on the rating
of the unit. Where the existing consumer unit does not
have a spare way of adequate capacity, an additional
small consumer unit is required. This should include a
30mA rcd. Additional meter tails are needed and the
circuit will have to be tested and certified before
the supply company will make the connection to their
system.
Step 6 - Electrical supply - cable specifications
The cable size needed can be determined from the
Table of Sizes. You will require a 45A double pole
isolating switch in the cable run. If you prefer to
locate this in the bathroom it must be a pull cord
operated type.
Step 7 - Installing electrical cables to your shower
Plan the route carefully before starting. Cable is
sold either by the metre or on 50metre drums.
Calculate the total amount of cable needed and then
work out the most economical way of buying the
cable.
Step 8 - Terminating the electrical cables
Never cut the cable off too short, as mistakes will
prove costly. Always leave a small loop when terminating
a cable. This will make it easier to push the cable end
into the terminal.
Step 9 - Connecting to the Consumer Unit
Always switch off the main isolator and take great
care to be aware of the dangers, before taking off
the front cover of the consumer unit.
Step 10 - Safety! Supplementary earth bonding
It is essential to install supplementary earth bonding
when electrical shower units are installed.