Triton T300si Installation And Operating Instructions Manual page 7

fuse (see Table A).
5.1 A 30mA residual current device (RCD) must
be installed in all UK electric and pumped
shower circuits. This may be part of the
consumer unit or a separate unit.
6 A 45 amp double pole isolating switch with
a minimum contact gap of 3 mm in both
poles must be incorporated in the circuit.
6.1 It must have a mechanical indicator showing
when the switch is in the OFF position, and
the wiring must be connected to the switch
without the use of a plug or socket outlet.
6.2 The switch must be accessible and clearly
identifiable, but out of reach of a person
using a fixed bath or shower, except for the
cord of a cord operated switch, and should
be placed so that it is not possible to touch
the switch body while standing in a bath or
E-002-A
shower cubicle. It should be readily
accessible to switch off after using the
shower.
7 Where shower cubicles are located in any
rooms other than bathrooms, all socket
outlets in those rooms must be protected by
a 30mA RCD.
8 The current carrying capacity of the cable
must be at least that of the shower circuit
protection (see Table B).
8.1 To obtain full advantage of the power
provided by the shower, use the shortest
cable route possible from the consumer unit
to the shower.
8.2 It is also necessary to satisfy the
disconnection time and thermal constraints
which means that for any given combination
Table B
of current demand, voltage drop and cable
size, there is a maximum permissible circuit
Twin and earth PVC insulated cable
length.
Current carrying capacity
9 The shower circuit should be separated from
other circuits by at least twice the diameter
of the cable or conduit.
Installed in an In conduit
9.1 The current rating will be reduced if the
insulated wall trunking
cabling is bunched with others, surrounded
6 mm²
by thermal loft or wall insulation or placed in
32A
areas where the ambient temperature is
10 mm² 10 mm²
above 30°C. Under these conditions,
43A
derating factors apply and it is necessary to
16 mm² 16 mm²
select a larger cable size.
57A
9.2 In the majority of installations, the cable
will unavoidably be placed in one or more
Note: Cable selection is dependent on
of the above conditions. This being so, it
derating factors
is strongly recommended to use a
minimum of 10mm cabling throughout
the shower installation.
9.3 In any event, it is essential that individual
T300si electric shower
Clipped direct
or buried in a
non-insulated
wall
6 mm² 6 mm²
38A 46A
10 mm²
52A 63A
16 mm²
69A 85A
protection (see Table B).
8.1 To obtain full advantage of the power
provided by the shower, use the shortest
cable route possible from the consumer unit
to the shower.
8.2 It is also necessary to satisfy the
disconnection time and thermal constraints
which means that for any given combination
of current demand, voltage drop and cable
size, there is a maximum permissible circuit
length.
9 The shower circuit should be separated from
other circuits by at least twice the diameter
of the cable or conduit.
9.1 The current rating will be reduced if the
cabling is bunched with others, surrounded
by thermal loft or wall insulation or placed in
areas where the ambient temperature is
above 30°C. Under these conditions,
derating factors apply and it is necessary to
select a larger cable size.
9.2 In the majority of installations, the cable
will unavoidably be placed in one or more
of the above conditions. This being so, it
is strongly recommended to use a
minimum of 10mm cabling throughout
the shower installation.
9.3 In any event, it is essential that individual
site conditions are assessed by a competent
electrician in order to determine the correct
cable size and permissible circuit length.