4. Interconnection - Hard Wired
A combined maximum of 12 Smoke Alarms and/or Heat Alarms may be wired
together such that when one unit senses fire all other units sound a warning - (see
Table 1 for the alarms with hardwired interconnect option). This helps ensure the
alarm will be heard throughout the property.
Do not connect to any other device as it may damage the unit or affect performance.
A maximum of 250 metres of two core, 0.5mm
2
to 0.75mm
2
, stranded signal cable
can be used, (maximum resistance between detectors 50 ohm). The Alarms are
interconnected by wiring all the terminals marked 1 together, and all the terminals
marked 2 together (see in Figure 9a). Note: Draughts from wiring openings, conduit,
or mounting boxes/holes, may blow smoke away from the sensing chamber,
17
OPENING IN
MOUNTING PLATE
Figure 9b
12 12
Figure 9a
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