Mira Sport Installation, Operation, Maintenance Manual page 12

2.2. The Mira Sport
conductor to the earth terminal.
Supplementary bonding: Within the bathroom or shower room, all accessible
conductive parts of electrical equipment and extraneous conductive parts that
are likely to introduce earth potential, must be electrically bonded to earth using
a minimum cable size of 4.0 mm
2
mm if mechanically protected).
2.3. The minimum cable size (cross-sectional area) required is 6 mm
conditions of installation.
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 size which
will prevent damage to the cable caused by overheating.
2.4. To obtain full advantage of the power provided by this unit, use the shortest
possible cable route from the consumer unit to the shower. It is also necessary
to satisfy the disconnection time and thermal constraints which mean that, for
any given combination of current demand, voltage drop and cable size, there is
a maximum permissible length of circuit.
As a guide only, the following maximum permissible lengths are given for
2
6 mm and 10mm
volt drop:
Mira Sport 10.8 kW (240 V AC) at 240 V - 15 metres 6 mm cable
Mira Sport 10.8 kW (240 V AC) at 240 V - 25 metres 10 mm cable
2.5. A 30 mA residual current device (RCD) should be fitted. This may be part of the
consumer unit or a separate unit.
2.6. A separate, permanently connected supply must be taken from the consumer
unit to the Mira Sport through a 45 amp double-pole switch, which has at least
3 mm contact separation. The switch can be a ceiling mounted pull-cord type
within the shower room or a wall mounted switch in an adjacent room.
2.7. DO NOT twist the individual cable cores of the live and neutral conductors, as
this will prevent them from entering the terminal block.
2.8. DO NOT exert strain on the terminal block.
2.9. DO NOT turn-on the electrical supply until the plumbing has been completed.
12
must be earthed by connecting the supply-cable earth
2
if the cable is not mechanically protected (2.5
2
cable protected by a 45A MCB type B and allowing for a 5
2
under normal