Ambirad COBRA CB40 Installatie-, Bedienings-, Onderhouds- en Servicehandleiding - Pagina 5

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2 Electrical connection

This appliance must be earthed.
Supply 230V 50Hz single phase.
Current rating 0.55 amp max (inductive).
Fuse: external 3 amp.
All electrical work should be carried out to
IEE standards by a competent electrician.
The electrical connection to the heater is
made by means of a three pin plug-in
power connector. Live, neutral and earth
connections should be made via a flexible
supply cable to the power connector and
routed clear of the heater or tubes. The
flexible supply cables should be of 0.5mm
complying with BS 6500:1990.
W i r i n g
The wires in the mains lead are coloured in
accordance with the following code:
Green & Ye l l o w E a r t h
B l u e
N e u t r a l
B r o w n
L i v e
Instructions for connecting mains lead to
the plug:
Connect the green and yellow to plug
terminal marked E. Connect the blue wire
to terminal marked N. Connect the brown
wire to terminal marked L.
It is recommended the electrical circuit
controlling the heater or group of heaters
incorporates thermostats, a time switch and
if required manual control switches and a
frost thermostat.
Circuits and controls
All such controls and switchgear must be
rated to handle the total inductive load of
the circuit they control. Load per
Ambi-Rad heater is 0.55 amp. For large
installations, the use of relays and
contactors should be considered. The
method of connection to the electrical
supply must facilitate complete isolation
and should be made via a fused double
pole isolator having a contact separation
of at least 3mm in all poles and supplying
the appliance only.
Figure 2 Typical external wiring
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Note For more comprehensive control arrangements see black bulb and control panel
leaflets.
Figure 3 Internal wiring diagram
Alternatively, connection may be made via
a fused three pin plug and un-switched
shuttered socket, both complying with the
requirements of BS 1361:1971 (1986).
Ensure that a copy of the lighting
instructions plate is affixed adjacent to the
electricity supply switch. Should this
switch serve more than one heater it is
only necessary to affix one copy per
service.
Thermostats and other controls
For details on the use and siting of
thermostats (if used) refer to Ambi-Rad
leaflets Doc Ref GB/CON/002/0902.
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