Chapter 2: Design and installation
12 Alarmline II Digital Linear Heat Sensor Cable Technical Manual
• The cable should be installed no closer than 25 mm and no further than
150 mm from the fixing surface.
• Fixing of the cable will be determined by the application and the installation
location. The cable must be supported at 1 m intervals (min.), with additional
supports where there are bends in the cable. The environmental conditions
and clips to be used must considered.
• The minimum bend radius when installing AD68, AD88, AD105, and AD185
sensor cables in ambient conditions of 0°C (32°F) and above is 50 mm (2 in.)
or 63.5 mm (2.5 in.) for AD218 sensor cables.
For areas where ambient conditions are likely to be less than 0°C (32°F) the
minimum bend radius for AD68, AD88, AD105, and AD185 sensor cables is
100 mm (4 in.) or 127 mm (5 in.) for AD218 sensor cables.
In hazardous areas, galvanic isolators or intrinsically safe (IS) barriers are
required to provide an IS circuit.
Installation
Caution: This product must be installed and maintained by qualified personnel
adhering to all local or national installation requirements and any other applicable
regulations.
As well as the installation of the sensor cable within the risk area this section also
provides details on interfacing the sensor cable into the fire alarm monitoring
equipment.
Installation guidelines
Note: Perform a continuity test on the reeled cable prior to installation to ensure
that no damage has occurred during transit.
It is not possible to provide definitive installation instructions as each application
will be uniquely different. The following points outline general requirements for
installation.
• Sensor cable must only be installed in the area to be protected. If the
equipment monitoring the sensor cable is not installed within the risk area
then a suitable interposing/leader cable can be connected between the
sensor cable and the monitoring equipment.
• Sensor cables can be provided with various outer sheaths to suit the
environment (PVC, nylon, polypropylene, and stainless steel braid). Be sure
to select the correct protective outer sheath to suit the environment.
• Sensor cables should be terminated in junction boxes that are suitable to the
environment.
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