Electric Fence Tips

E Fence board

Electric Fencing Maintenance

Tips to Keep Your Electric Fence in Good Working Order

For a safe, dependable electric fence, we recommend you follow these helpful hints:

Use a voltage tester to check the fence line every day. This will highlight potential before the animals find them.

Only use a fencing lead out cable to connect the energiser to the fence line (or other lead out specifically for electric fencing and designed for 20,000 volts or more). Normal commercial or domestic cable will not be satisfactory as it is not designed for these high voltages.

Install the earth stakes at least 10 metres away from any mains earth system, buried telephone lines, or water pipes. These may pick up the current and deliver a shock to taps and water tanks or cause interference with phones, televisions or radios.

Use only high-quality insulators and connectors. Cracked, poor-quality and makeshift insulators (such as water hoses) will degrade the performance of the fence or cause it to fail completely, particularly when using high powered energisers. Do not connect electrified wire directly to wood or steel posts. Whilst this may appear satisfactory in dry summer weather, it will cause huge voltage losses when wet.

Most damage to energisers results from power surges and lightning strikes. Lightning is so powerful that nothing can give 100% protection and the closer the strike is to the energiser the greater the damage is likely to be, particularly when using high tensile fence wires. To reduce the chance of damage from lightning, lightning diverters and surge suppressors offer some added protection.

If a severe thunderstorm is imminent, disconnecting the energiser temporarily from the power source and the fence line will prevent possible lightning damage.

If you have long fence lines, keep a spare bag of each type of insulator on hand to quickly replace those that may become damaged.

Use bolts to securely connect the earth wire to the earth stakes. Do not use hose clamps or wrap wire around the rod.


An electric fence was primarily developed for the restriction of animal movement. Since this time the security industry used the initial technology and improved on it to give a system utilizing wires fitted on insulators and powered by an energizer which is capable of delivering a substantial and most uncomfortable shock.

The energizer in simple terms is a transformer that can convert low power to a huge quantity of power to the person touching the wires. The energizer used for this purpose will not allow anyone to be killed as the unit is designed to allow the power to pulsate on/off on a continuous basis. Therefore unlike your power in the house where a possibility exists that you could die if experiencing a shock, the electric fence power switches on and off momentarily and therefore is termed a non-lethal electric fence.

If the intruder still attempts to break through the fence, early detection, audible alarms and integration with an armed response reaction team help to secure your safety. Trying to maneuver around the fence will also delay the attempted break-in, giving additional time for a reaction team to respond.

How Does It Work?

The heart of your electric fence is the energizer. This device produces the high-voltage electrical pulse that is transmitted around a multi-wire perimeter fence. The strength of the shock depends upon the power available from the energizer, and the total resistance of the circuit.

Unique Air& Automation supply a range of energizers to support domestic and light industry security requirements, through to high security fencing where dual zones, networking and large fence systems are required. Unique Air only uses products which are of excellent quality and have fast turnaround time on repairs. We also service, repair and maintain most electric fencing products in the market place.

The professionally made energizes conform to strict legislation and must comply with such governing bodies as the government gazette, post office and SABS. This legislation has been introduced to stop the public from being fatally shocked.

There is also other controlling legislation such as the minimum installation height permissible and warning sign requirements etc.

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