Kohler Thermostatic Electric Shower - Manual (Page 10)

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In a domestic installation, the rating of the electricity supplier’s fuse and
the consumer unit must be adequate for the additional demand. All Mira
electric showers are high power units, it is essential to contact your
electricity supplier to ensure that the supply is adequate for the product.
Voltage drop due to local heavy demand will reduce the shower’s
performance.
The appliance 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 (metal parts) that are likely to introduce earth potential,
must be electrically bonded to earth using a minimum cable size of
4.0mm 2 if the cable is not mechanically protected, (.5 mm 2 if
mechanically protected).
The minimum cable size (cross-sectional area) required should be in
accordance with BS 767.
As a guide only, and in accordance with BS 767 we recommend close
circuit protection: i.e. 9.8 kW = 45 Amp
It is strongly recommended that a 30 mA Residual Current Device (RCD)
is included in the electrical circuit. This may be part of the consumer unit
or a separate unit.
A separate, permanently connected supply must be taken from the
consumer unit to the appliance through a double-pole switch, which has
at least 3 mm of contact separation. The switch can be a ceiling mounted
pullcord type within the shower room, or a wall mounted switch in an
adjacent room.
DO NOT twist the individual cable cores of either the live or neutral
conductors, as this will prevent them from entering the terminal block.
DO NOT exert strain on the terminal block. Ensure that the electrical
connections are tightly screwed down.
DO NOT turn-on the electrical supply until the plumbing has been
completed.
. Electrical