Mira Sprint 7.5 Installation, Operation, Maintenance Manual page 12

Double checkvalves, fitted in the inlet supply to the appliance, cause a pressure
build-up, which could exceed the maximum static inlet pressure for the appliance.
1.14. Avoid layouts where the shower hose will be sharply kinked. This may reduce the life
of the hose.
2. Electrical
2.1. In a domestic installation, the rating of the electricity supply company fuse and the
consumer unit must be adequate for the additional demand. As these Mira Sprints
are high power units, it is essential to contact your electricity supply company to
ensure that the supply is adequate for the Mira Sprint. Voltage drop due to local
heavy demand will reduce the shower's performance.
2.2. The Mira Sprint 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 that are
likely to introduce earth potential, must be electrically bonded to earth using a
minimum cable size of 4.0 mm
if mechanically protected).
2.3. Details for the method for determining the cable size are to be found in the
BS 7671 (Formally known as the 16th Edition of the IEE Wiring Regulations). The
minimum cable size (cross-sectional area) required is 6 mm
conditions of installation .
12
Hose Retaining
Ring
25 mm Minimum
Figure 1
2
if the cable is not mechanically protected (2.5 mm
Spill-over
Level
2 under normal
2