Mira Play 8.5 kW Installation & User Manual page 11

Electrical (checklist in detail)
1. 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 Play electric
showers are high power units, therefore 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.
2. The appliance must be earthed by connecting the supply cable's 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. If the cable is not mechanically protected, the cable size must
be a minimum of 4.0 mm² (2.5 mm² if mechanically protected). Use a suitable
earth bonding strap to connect the earth terminal to 15 mm copper pipe. The
installation must comply with the "Requirements for electrical Installations" in
accordance with BS 7671.
3. Supply cable - see opposite.
Important! The shower circuit should be separated from other circuits by at
least twice the diameter of the cable or conduit, and it should not be run through
thermally insulating material or in locations where the ambient temperature is
likely to exceed 30°C. If any of these conditions are unavoidable, it is necessary
to determine the cable size which will prevent damage to the cable caused by
overheating.
4. As a guide only, and in accordance with BS 7671 we recommend close circuit
protection: i.e. 9.5 kW = 40 Amp.
A 30 mA Residual Current Device (RCD) must be included in the electrical
circuit. This may be part of the consumer unit or a separate unit. A separate,
permanently connected supply is taken from the consumer unit to the appliance
through a double pole isolating 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.
5. DO NOT twist the individual cable cores of either the live or neutral conductors,
as this will prevent them from entering the terminal block.
6. DO NOT exert strain on the terminal block. Make sure that the electrical
connections are tightly screwed down.
7. DO NOT turn on the electrical supply until the plumbing has been completed.
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