How An Electric Fence Works

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An ELECTRIC FENCE works by “educating” your animals so that they learn to associate touching the fence with receiving an unpleasant shock. This is the same principle as barbed wire, but it presents a much more powerful deterrent with very little danger of physical damage to your stock. Electric fences are used to successfully control many kinds of animals, both domestic and feral. The source of the shock is an electric fence energiser. The energiser provides regular pulses of electricity to your fence. These intermittent high voltage pulses flow from the energiser, along connection cable to the fence, and then along the length of the fence. The “live” wires of your fence should not come into contact with fence posts or corner posts, and this achieved by the use of insulators. When an animal comes into contact with the fence, it becomes part of an electric circuit between the output terminals of your energiser. The strength of the shock the animal receives depends upon the power available from the energiser, and the total resistance of the circuit.

The total resistance of the circuit includes:

1. The resistance of the live fence wire leading from the energiser to the animal.
2. The resistance of the animal itself.
3. The resistance between the animal and the earth.
4. The resistance between the earth and the earth terminal of the energiser.

The general principles of electric fencing can be explained by examining the three basic electric fence systems:

1. Earth Return System
2. Fence Return System
3. Bi-Polar Fencing System
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