Quadnet Control Panel Engineering and Commissioning Manual
11
Topology & Cabling
All system wiring should be installed to comply with BS 5839: Pt 1: 2002: Amendment 2: 2008 and BS 7671
(wiring regulations) and any other standards relevant to the area or type of installation. A cable complying
with the BS 5839: Pt 1: 2002 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. MICC, FP200,
Firetuff, Firecell, Lifeline or equivalent). Ventcroft No-Burn multicore cable was utilised during the LPCB
approval testing.
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 ................................
12.1Ω / km
Fire Proof ........................................................................................ BS5839: Pt1: 2002 Category 1
Example .......................................................................................... Datwyler 8700
Addressable Circuit Wiring
The addressable circuit must be installed as a loop with a maximum length of up to 2 km.
Addressable 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
.
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.
