TWINFLEX
®
pro Repeater Panel Engineering and Commissioning Manual
11
Installation and Commissioning
Topology & Cabling
All system wiring should be installed to comply with BS 5839: Pt 1: 2002 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 (i.e. MICC, FP200,
Firetuff, Firecell, Lifeline or equivalent).
In order to protect against possible data corruption it is important to ensure the following points are
adhered to:
1. The 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 metal back box.
2. The cable screen continuity must be maintained at every point of the circuit, using the
terminals provided or a suitable connection block.
3. Do not use a 4-core cable as a 24v supply and communications, due to the possibility of
data corruption. It is essential that two 2-core screened cables are used, one for the 24V
DC supply and the other for communications.
Maximum Cable Lengths
The maximum total cable length from the control panel to a repeater is 500 metres.
Up to 8 repeaters can be used but they must all be within the maximum 500 metres cable length.
Refer to power supply and peripheral bus connections below for further details.
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