Cable Layout Guidelines - Interlogix FlexZone Series Product Manual

* FlexZone sensor cable may include a mylar film between the outer black jacket and the
braided shield. The mylar film is used in the cable extrusion process and has no effect on the
cable's function.
FlexZone sensor cable comes in 150 m lengths. Two lengths of FlexZone cable
can be spliced together to provide a 300 m sensor cable.

Cable layout guidelines

•
The full length of sensor cable must be mounted on the same type of surface.
•
The maximum length of cable for each side of the processor is 300 meters.
•
The smallest allowable bend radius for FlexZone sensor cable is 10 cm.
•
Keep vertical drops of sensor cable to less than 1 m.
•
The sensor cable should follow the ground contour to maintain a constant
height above the ground.
Note: It is strongly recommended installing the sensor cables on the secure side
of the perimeter (the side of the fence opposite the threat).
Cable length calculator (flexible fences)
Typically, fence coverage requires approximately 10% more cable than the linear
fence length. The following table provides a guideline for calculating the amount
of sensor cable required for a 2.44 m fence (in meters):
Zone element
start point
service loops
zone demarcation loops
sensitivity loops
cable terminations and splices
linear zone length
required length of cable per pass
total length X number of passes
Rigid fences
Service loops, zone demarcation loops and sensitivity loops are not recommended on rigid
fences. Therefore, the length of cable required on a rigid fence is approximately the length of the
fence plus 5% overage.
Fence height recommendations
The following cable spacing recommendations provide good security on well-
maintained fences.
•
For flexible fences up to 4.3 meters tall - a single pass of sensor cable at 1/2
the fence height.
FlexZone™ Product Guide
Required cable length
+ 1 m
+ 0.75 m X (linear zone length / 50)
+ 3.5 m X number of zone boundaries
+ 3 m X number of corner and heavy gauge posts
+ 0.5 m each
+ _ _ _ _ _ (zone length in meters)
= _ _ _ _ _ (total length in meters)
= _ _ _ _ _ cable length (max. 300 m)
Chapter 1: System planning
9