| The wiring system used for security fencing is
known as the 'earth return' method and consists of a varying
number of alternate positive (live) and negative (earth) wires.
It has three major advantages: |
|
Deterrent Effect
An intruder will receive an uncomfortable shock either by touching
a live wire and earthing to ground or by making simultaneous
contact with an earth wire and a live wire. To achieve this
deterrent effect it is preferable to have 6500 to 8000 V with
1.5 to 3 J energy on the fence line. |
|
|
Detection Capability
The system will generate an alarm signal when an earth and a
live wire make contact and ‘short’ the system, or
if the circuit is broken by cutting any of the wires. |
|
|
Reliability
Electric security fencing technology is inherently tolerant
of environmental conditions and is made more so with Dynamic
Voltage Monitoring. With this feature the fence detection focus
is on sudden, abrupt changes in voltage, allowing the system
to ignore seasonal changes caused by vegetation growth or weather
changes. |
