Dual Zone Digital Location Control Unit Installation and Operation Manual
14
Interposing cable
In many applications it is not possible to install the control unit close enough to
the location of the digital sensor cable, therefore an electrical connection needs
to be provided between them.
An interposing cable can be used to provide an electrical connection between the
control unit and the sensor cable.
Interposing cable should be suitably fire rated to maintain the integrity of the
interposing cable in a fire condition until the sensor cable has triggered an alarm.
Caution:
A short circuit on the interposing cable activates a fire condition.
Ensure that this does not contravene any applicable local standards. The risk of
a short circuit on the cable can be reduced by selecting a suitably robust cable or
by providing additional protection (for example, a conduit).
The recommendations for interposing cable are as follows:
Cable size
Max. leader cable length
20 AWG
1000 m (3281 ft.)
Stranded copper 16 x 0.2 mm
Single-core copper 0.8 mm diameter
22 AWG
600 m (1968 ft.)
Stranded copper 7 x 0.25 mm
Single-core copper 0.6 mm diameter
24 AWG
390 m (1280 ft.)
Stranded copper 7 x 0.2 mm
Single-core copper 0.5 mm diameter
