Site survey
Page 20
FiberPatrol Site Planning & Installation Guide
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 3 m (10 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.
Climb-over deterrent hardware
Barbed wire
Climb-over deterrent hardware is strongly recommended on perimeter fences under the following
conditions. Barbed wire outriggers must be secure to prevent movement due to environmental
conditions. Install bracing wires between the outrigger supports to prevent the barbed wires from
spreading apart. Each barbed wire strand should be taut and tightly secured at each support. Any
extension arms or outriggers attached to post tops should have a tight press-fit/set-screw or be
spot-welded. Remove or fasten any loose or rattling material.
It is possible to install FiberPatrol sensor cable on barbed wire, but extra precautions must be
taken to avoid damage to the sensor cable. Run the sensor cable along the fence and loop the
cable up beside the fence posts. Secure the sensor cable to the barbed wire so that the cable
Note
Contact FiberPatrol for information about using the FiberPatrol sensor
on fences that are greater than 3 m (10 ft.) high.
Figure 19 Recommended fence height/cable pass configurations
Note
For instances in which a portion of the fence is covered by a climb-over
deterrent (i.e., razor ribbon/concertina) the fence height should be
based on the uncovered portion of the fence. For example, a 3.7 m
(12 ft.) fence with a 90 cm (3 ft.) coil of concertina wire covering the top
section of the fence should be considered a 2.75 m (9 ft.) fence.
The concertina wire must be securely attached to the fence to prevent
any metal on metal contact resulting from environmental conditions.
fences < 3 m (10 ft.)
fences with middle rails