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Fences
Page 24
FiberPatrol FP1150 Product Guide
Fences
The fence must be properly installed, tensioned, and maintained, to provide effective intrusion
detection with FiberPatrol. The fence should be uniform in height and quality, and should be high
enough to present an effective barrier against climb-over intrusions. It is also recommended that a
climb-over barrier, such as barbed wire or concertina, be installed along the top of the fence. The
condition of the fence is critical to the efficient operation of the FiberPatrol sensor system. Breaks
in the fence structure, or slack portions of the fence fabric, will inhibit the transmission of the fence
vibrations to the sensor cable. Poor fence conditions can also cause metal on metal contact noise
during windy conditions, which will result in nuisance alarms.
Chain-link fences
The chain-link fence fabric should meet the following specifications:
•
maximum range of deflection 10 cm (4 in.) when a 22.5 kg (50 lb) force is applied
perpendicular to the center of a panel (pushing and pulling) (based on 3 m, 10 ft. post spacing)
•
minimum height of 2.4 m (8 ft.) with climb-over deterrent hardware securely mounted on top
Weld-mesh fences
A typical weld-mesh fence section consists of 3 mm (0.1 in.) diameter steel wire welded into a grid
configuration, with horizontal spacing differing from the vertical spacing. These fence sections are
secured to fence posts and to the adjacent fence panel sections. The sections of weld-mesh fence
are either welded together or connected using clips, bolts or rivets. The minimum recommended
height for a weld mesh fence is 2.4 m (8 ft.) and climb-over deterrent hardware should be securely
mounted on top. All components must be securely connected to prevent any metal on metal
contact which can be caused by moderate to strong winds.
Fence height considerations
FiberPatrol will provide a good level of detection for fences up to 4.3 m (14 ft.) high with a single
pass of cable. The single cable pass is installed at one-half the fence height unless the fence
includes a middle rail. For fences with a middle rail, the sensor cable should be installed 30 cm
(1 ft.) below the middle rail.
Note
Fences used in conjunction with the FiberPatrol sensor must meet
industry standards for security fences.
If you are not sure of the suitability of your fence for a FiberPatrol
sensor, hire a local fencing contractor to inspect, and if required, repair
the fence.
Note
Any fence movement which can cause metal-to-metal contact is a
potential source of nuisance alarms.