How it works
 

Security fence wiring

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.

 

 

 

Wiring schematic for a security system using AM1 or AM2 security monitors with any security approved energiser

The AM1 and AM2 have been designed with high voltage optical isolation between the fence circuit and the battery circuit. They can be used with any energiser, mains or battery. Battery energisers are usually used for security applications because they will continue to function if mains power is accidentally or deliberately removed.
 

 

Earthing and insulators
The system has two earths. The main or primary at the energiser and secondary earths along the fence line.
Insulators are used on both live and earth lines.
Ensure earth systems are located within the enclosure secured by the electric perimeter fence.
Warning
Ensure earthing systems are at least 10 m (33') from other electrical earths or telephone cables.
Do not connect earth systems to sheds or concrete footings, as these are poor earths.
Ensure earth systems are located within the enclosure secured by the electric perimeter fence.

 

 

 
 

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