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INFINITY 8 INSTALLATION MANUAL
2. FIRST FIX
All wiring must be installed to meet BS5839: Pt1: 2002 and BS 7671 (Wiring Regs) standards. Other National standards of fire
alarm system installation should be adhered to where applicable.
2.1 RECOMMENDED CABLE TYPES AND THEIR LIMITATIONS
Screened cables should be used throughout the installation to help shield the Panel from outside interference and ensure EMC
compatibility.
The two categories of cable according to BS5839: Pt1: 2002, Clause 26 "Fire Detection and Alarm Systems for Buildings (Code of
Practice for System Design, Installation and Servicing)" are:
Standard fire resisting cable – to PH30 classification of EN 50200
Enhanced fire resisting cable – to PH120 classification of EN 50200
(Note that all cables should be at least 1mm2 cross section
On the Infinity Panel the general recommendation would be to use standard fire resistant cable, such as Fire Defence, Firetuff™ ,
FP200 or an equivalent. These cables are screened, and will provide good ECM shielding when properly grounded at the panel.
Certain system specifications may demand the use of a particular type of cable and due regard should be paid to this fact.
Depending on the environment, the cables may need mechanical protection (such as a conduit).
2.2 MAINS WIRING RECOMMENDATIONS
The Mains supply to the FACP is fixed wiring, using Fire resisting 3-core cable (Between 1 mm² and 2.5mm²) or a suitable 3-
conductor system, fed from an isolating double pole switch fused spur, fused at 3A. This should be secure from unauthorised
operation and be marked 'FIRE ALARM: DO NOT SWITCH OFF'. The supply must be exclusive to the Fire Panel.
For information on how to connect Mains to the Panel's Power Supply PCB, see page 8.
Also refer to rating information inside the FACP.
2.3 DETECTOR CIRCUIT WIRING DIAGRAM
The Infinity comes with one, two, four, six or eight Detection circuits (Zones). A maximum of 32 devices (i.e. smoke detectors, heat
detectors, or Manual Call Points) can be fitted to each circuit. ALL DEVICES MUST BE POLARISED.
Typical detector circuit wiring:
An End of Line diode (provided in the Panel) must be connected across the terminals of the last device on each circuit to allow the
wiring to be monitored. It is polarity sensitive, and connected cathode (STRIPE) to +ve
Using detector bases with continuity diodes fitted will allow all devices, including Manual Call Points to remain operational if a
detector is removed from its base.
Old Manual call points, which just cause a short circuit, are not directly compatible, as they would cause a short circuit fault. Fitting
a 470R resistor in line with the call point will allow it to work. (Wired in a similar way to non-polarised bells shown at the foot of this
Approved Document No. GLT-201-7-1
Issue: 1.6
Author: NRPJ
Date: 27/7/2012
PAGE 4
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