CIE-A-200 Control Panel Engineering and Commissioning Manual
12
Addressable Circuit Wiring
Topology & Cabling
All system wiring should be installed to comply with the current BS 5839: Pt 1 and BS 7671 (wiring regulations)
and any other standards relevant to the area or type of installation. A cable complying with the current
BS
5839: Pt 1: Category 1 (cables required to operate for prolonged periods during fire conditions) is required.
This must be a 2-core 1.5mm
2
screened fire resistant cable (ie.FP200, Firetuff, Firecell, Lifeline or equivalent).
Cable Specification
Max Capacitance Core to Screen ................................................... 180pF / m
Max Capacitance Core to Core ....................................................... 100pF / m
Max Inductance ............................................................................... 1.0mH / km
Max Resistance Two Core Screened 1.5mm² ................................ 12.1
Ω / km
Fire Proof ........................................................................................ BS5839: Pt1: Category 1
Example .......................................................................................... FP200, Firetuff, Firecell
The addressable circuit must be installed as a loop with a maximum length of up to 2 km.
Spur circuits are NOT permitted with this system.
In order to protect against possible data corruption, it is important ensure the following points are adhered to:
1. The addressable circuit cable
screen must be connected to the loop SCRN terminal at the
control panel.
Both ends must be connected using the terminals provided.
2. The addressable circuit cable screen must not be connected to earth/ground at any point other
than the control panel (at the SCRN terminal provided, not at any earthing point).
Do not connect
the screen to a device back box (flush)
.
3. The addressable circuit cable
screen continuity must be maintained
at every point of the loop,
using the terminals provided or a suitable connection block.
4.
Do not use a 4-core cable
as a loop
feed & return
due to the possibility of data corruption. It is
essential that two 2-core cables are used if this is required.
5. Excess cable lengths
must not be coiled
as coiling will increase the inductance and cause
communication problems.
6. Fire alarm addressable circuit cabling must be separated from other building system cables by
at least 300mm and not run within 500mm of any mains power cables.
7. Avoid running fire alarm addressable circuit cables in parallel with mains power or any other
building system cables.
Where a cross-over between fire alarm addressable circuit cables and
mains power or other building system cables is unavoidable, the cables should be arranged to
cross at right angles with as much separation as possible.
8. Fire alarm cabling should not be run in any cable management system such as trunking, conduit
or on cable trays that are being used by mains power or other building system cables.
