INSTAFLOW
10
Table B
In conduit
trunking
6mm²
38A
10mm²
52A
16mm²
69A
Installed in an
insulated wall
6mm²
32A
10mm²
43A
16mm²
57A
Clipped direct
or buried in a
non-insulated
wall
6mm²
46A
10mm²
63A
16mm²
85A
4mm²
25A
4mm²
30A
4mm²
36A
Lorem ipsum
Note: Cable selection is dependant
on derating factors
Twin and earth PVC insulated cable
current carrying capacity
6 A 45 amp double pole isolating switch with
a minimum contact gap of 3mm 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
able, but out of reach of a person
u
xed 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
shower cubicle.
7 The current carrying capacity of the cable
must be at least that of the water heater circuit
protection (see Table B).
7.1 To obtain full advantage of the power
provided by the water heater, use the shortest
cable route possible from the consumer unit
to the unit.
7.2 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.
8 The water heater circuit should be separated
from other circuits by at least twice the
diameter of the cable or conduit.
8.1 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.
8.2 In the majority of installations (see
Table B), 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 for units rated over 8kW.
8.3 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.
EN 61000-3-12：
“This equipment complies with IEC 61000-3-12
provided that the short-circuit power Ssc is greater
than or equal to xx at the interface point between
the user's supply and the public system. It is the
responsibility of the installer or user of the
equipment to ensure, by consultation with the
distribution network operator if necessary, that
the equipment is connected only to a supply with
a short-circuit power Ssc greater than or equal to
350."
EN 61000-3-11：
“To be in compliance EN 61000-3-11, the product
shall be connected only to a supply of the system
impedance:
I Zsys I = 0.031776 ohms or less.
Before connecting the product to a public power
network, please consult your local power supply
authority to ensure the power network meets the
above requirement.”
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