TM204
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Issue 1.1
5
Connecting to the Circuit Boards
All connections for field wiring are to rows of terminals along the top and bottom of the circuit boards.
Shielded fire alarm cable such as FP200 and metal cable glands must be used for all connections to the
panel. The shield of the cable must be bonded securely to the enclosure earth via a metal cable gland.
The resistance of any core of any cable must not exceed 25 ohms. The shield of the cable must be
bonded securely to the enclosure, via the metal gland.
Wiring should enter the enclosure at the top or back of the panel, using the knockouts provided and be
dressed tidily to the appropriate terminals.
Route mains cables away from all other cables and segregate by 50mm.
Terminals are capable of accepting wires of up to 2.5mm
2
.
Wiring must not go across the front of the circuit boards. If cable entries need to be in positions other
than at the knockouts provided, wiring must be fed behind and well away from the surface of the circuit
board.
The space at the bottom of the enclosure is largely occupied by the standby batteries, so this must be
taken in mind when considering cable entry points.
5.1
Detection Zone Wiring
The detection zones provide a nominal 20V dc to power conventional detectors and call points as listed
in compatibility tables 2 and 3.
The wiring is monitored for open and short circuit fault conditions by placing a 6K8 0.5W end of line
monitoring resistor in the last device that is wired to the zone circuit (resistors are supplied in panel
terminals).
Detection zone circuits must be wired as a single, radial circuit with no spurs to enable the monitoring
circuit to work correctly.
For systems that are required to comply with BS5839 Part1:2002 detector removal requirements, either
detector bases fitted with a Schottky diode should be used and the end of line resistor replaced with an
LCMU active end of line monitoring device or zener clamping bases such as Hochiki PA6 or Apollo
Savwire used.
