T30i
5
Table A
CIRCUIT PROTECTION
unit cartridge
rating MCB fuse
3.0kW – 13A
7.0kW 30/32A 30A
6.2 The switch must be accessible and clearly
identifiable, but out of reach of a person
using the unit.
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 handwash unit
circuit protection
(see table B).
8.1
To obtain full advantage of the power
provided by the handwash, use the shortest
cable route possible from the consumer unit
to the handwash.
8.2
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 circuit
length.
9
The handwash 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 any event, it is essential that individual
site conditions are assessed by a competent
electrician in order to determine correct
cable size and permissible circuit length.
Table B
Twin and earth PVC insulated cable
CURRENT CARRYING CAPACITY
clipped direct or
installed in an in conduit buried in a non
insulated wall or trunking insulated wall
1.5mm² 1.5mm² 1.5mm²
14A 16A 19A
2.5mm² 2.5mm² 2.5mm²
18A 23A 27A
6mm² 6mm² 6mm²
32A 38A 46A
Note: Cable selection is dependent
on derating factors
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