Mira Sport Thermostatic 9.0 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 Sport
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 Mira Sport Thermostatic 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).
3. Supply cable - see opposite.
4. As a guide only, and in accordance with BS 7671, we recommend close circuit
protection:
i.e. 9.0 kW = 40 Amp
9.8 kW = 45 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.
11