Chapter 4: Application guidelines
Alarmline II Digital Linear Heat Sensor Cable Technical Manual 27
Escalators and moving walkways
Escalators and moving walkways can be found in many buildings such as
shopping centres, airports, train stations, etc. Underneath the escalator there are
many mechanical moving parts which can overheat due to friction if they become
seized or damaged. Due to the confined space under the escalator and the harsh
operating conditions (dust, oil, grease), it is a very difficult environment to install
any fire detection equipment.
Alarmline II Digital Sensor Cable is flexible enough to be installed close to the
main points of risk and be unaffected by the environment. Once the cable has
been installed there is no need to access it for maintenance purposes.
Due to the number of moving parts within the escalator, it may be advantageous
to use the stainless steel braided version of the cable which provides additional
mechanical protection. The recommended clip type for this application is the
edge clip (making installation easier and quicker).
There are three key areas of an escalator that should be considered when
providing detection:
• Bearings
• Trash collector trays
• Drive motor housings
Sensor cable can be used to protect all of these areas.
Figure 5 below shows the principle of protecting an escalator or moving walkway
with sensor cable. A continuous run of cable around the bearings and the trash
collecting trays at either end provides significant coverage.
Figure 5: Sensor cable installation for escalators and moving walkways
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