9
2
Before making any 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
The shower unit 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.
4
Check that the consumer unit (main fuse box):
a) Has a main switch rating of 80A or above and
b) Has a spare fuse way which will take the fuse/mcb (miniature circuit breaker) that you need to fit
If so you can wire the shower direct to the consumer unit (please refer to the typical system diagram above).
(Not all consumer units accept a 35/40/45A fuse sized fuse).
1
The shower unit must only be fitted to a 230-240V ac supply.
!
If the consumer unit has a rating below 80A or if there is no spare fuse way, then the installation will not be straightforward.
It may be necessary to install a new consumer unit to service the whole house or just the shower. A qualified person should
install this. It may be necessary to contact the electricity supplier to upgrade the incoming supply.
Electrical rating
!
Refer to the electrical rating diagram (shown below) to determine the nominal current of the shower. The current rating of
the supply cable must be at least that of the shower itself. Use the chart to choose a fuse or mcb with a rating of less than
that of your chosen cable.
Shower rating @ 240V
8.5kW
35.4A
39.6A
43.8A
40A
40A
45/50A
40/45A
Min cable
size mm
2
10
6
6
37
6
33
10
50
37
10
55
10
50
61
10
55
10
50
Max cable
run in m
Min cable
size mm
2
Max cable
run in m
Min cable
size mm
2
Max cable
run in m
40/45A
45A
9.5kW
10.5kW
Nominal current @ 240V
MCB rating
Conduit or trunking
Cartridge fuse
Installed in
insulated wall
Clipped direct
or buried in
uninsulated wall
Type
of
cable
run
