Cabling Instructions - Zircon EN54 Installation & Configuration Manual

EN54 & ISO 7240 2-8 Zone Conventional Fire Panel - Installation & Configuration Manual
WARNING Risk of electric
shock. Before working on
mains connections, ensure
mains power supply to the
panel is disconnected.
Ensure incoming earth
is connected to the
post provided and NOT
at the PSU PCB.
E
997-532-000-1, Issue 1
March 2006
3 Cabling
3.1

Cabling Instructions

All wiring should comply with current IEE wiring
regulations (BS7671) or the applicable local wiring
regulations. Note also the requirements of EN54-14 for
cabling and interconnection of a fire detection and alarm
system.
EMC Requirements: To meet the EMC requirements
of the European Directives, it is necessary to ensure
that a screened or metal sheathed cable is used.
Cable conductor size should be a minimum of 0.5mm
Terminals accept one 0.5 to 2.5mm
conductor.
Cables should be brought into the back box through the
20mm knockouts provided on the top face. Refer to
Section 2.5.2 for details on preparing the knockouts.
Ensure that all openings in the back box are closed off
before connecting power to the panel.
Mains Supply
The supply to the panel must be provided with a suitable
and readily-accessible, double-pole, mains-disconnect
device. The mains supply must be suitably fused and
rated according to the specifications.
Always ensure that the mains cables are brought into
the back box separately to the low-voltage wiring (refer
to Section 6.4 Powering the Panel). All low-voltage
cables should have a minimum 300Vac rating.
The termination of earth mains wiring must be done
before the termination of any external cable screens.
Cable Screen Wires
Cables should be screened. Screen wires should be
terminated inside the back box as follows:
a. Screen tails should be of sufficient length to connect
to the earth post (A) at the commissioning stage.
Once all screen wires have been terminated at the
earth post (A), use the M4 nut (B), spring washer (C)
and two plain washers (D) either side of the screen
wires to make sure a good earthing bond is created.
b. Use insulation sleeving on the tails between the cable
entry position and the earth post. Run the tails close
to the rear wall of the back box.
Note: In cases where all 8 zones are to be configured
and there is a need to reduce the number of cable
screen tails being routed through the panel, an
alternative method is to fit a suitable earth block
(not provided). The fixing points (E) may be used
to mount the block. Provide a suitable cable
between this block and the earth post. Using
insulation sleeving, terminate all cable screen tails
at the earth block.
10
2
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2
stranded or solid