9
2. Electrical
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 4.0 mm² if the cable is not
mechanically protected, (2.5 mm² if mechanically protected).
The minimum cable size (cross-sectional area) required should be in
accordance with BS 7671.
As a guide only, and in accordance with BS 7671 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.
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