MX Thermo Response QI, Installation And User Instructions Manual

Page: 12 / 28

12
9. ELECTRICAL CONNECTIONS
The electrical installation must be in accordance with
the current BS 7671 (I.E.E. wiring regulations) and
part P of the building and / or local regulations.
The shower unit is designed for a single phase 50 Hz
a.c. electrical supply.
ELECTRICAL SPECIFICATIONS
IMPORTANT: The heating elements on the UK
models are manufactured to 240V specification and
will give a lower kW rating if the voltage supply is
below 240V.
The shower unit must be permanently connected
to the electrical supply, direct from the consumer
unit via a double pole linked switch with a minimum
contact gap of 3 mm. The switch must be readily
accessible and clearly identifiable and sited out of
reach of a person using the shower over a fixed
bath or shower tray, unless the switch is pull cord
operated. The wiring must be connected to the
switch without the use of a plug or socket outlet.
The supply cable size is determined by the kW rating
of the product (as detailed on the rating plate fixed
to the back plate) and the distance between the
shower and the consumer unit. The table below is
for guidance only but will help you choose the correct
cable for your installation. If you are in any doubt
consult an electrician.
The incoming cable should be hidden.
IMPORTANT: The shower unit is supplied with 2
separate sets of connecting terminal blocks mounted
on the shower back plate so that the shower can be
wired for left or right installations with minimum
effort. ONLy connect to one of the terminal blocks.
The diagram below shows the route of the cable into
the shower unit for connection to the terminal block.
(illustrated on left hand side)
IMPORTANT: Remove the appropriate lower cover
section to improve access for mains cable fitting.
Earth cable to terminal marked
Neutral cable to terminal marked N
Live cable to terminal marked L
IMPORTANT
Ensure that the terminal block screws are fully tightened and that no cable insulation is trapped under
screws. Ensure the cable clamp is used to secure the cable. The earth continuity conductor of the electrical
installation must be effectively connected to all exposed metal parts of other appliances and services in the
room in which the shower unit is installed to confirm
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KW
RATING
NOMINAL
AT 240V
MINIMUM
RATING OF
ISOLATING
SWITCH
FUSE
RATING
MAX CABLE
RUN
6mm 10mm
7.5 31.25amps 40amps 40amps 29m 48m
8.0 33.33amps 40amps 40amps 27m 44m
8.5 35.41amps 40amps 40amps 23m 38m
9.5 39.58amps 40amps 40amps 21m 32m
10.5 43.75amps 45amps 45amps 18m 30m
N
E
Terminal
block
L
Nominal Power rating at 240V
8.5kW - (40A MCB rating)
9.5kW - (40A MCB rating)
10.5kW - (45A MCB rating)
Nominal Power rating at 230V
7.8kW - (40A MCB rating)
8.7kW - (40A MCB rating)
9.6kW - (45A MCB rating)