Brackets & Stays:
These are the poles / posts used to erect an electric fence.
Stays are used in conjunction with the brackets to provide additional support on strained sections of the fence, ie. corners, steps, gates, etc. Lugs are used as fixing devices for stays.
Stay sleeves insulate the stays from live fence wires.
Insulators are fastened onto the bracket and are used to insulate the electrified fence wire from the steel bracket
Fencing wire is used to carry high voltage around the selected perimeter. The fencing wire is routed around the perimeter by threading it through the insulators on the brackets. This creates the barrier and ultimately the electric fence.
Braided wire consists of a king wire and six outer wires twisted around the king wire. Different sizes are available, and in different materials.
Solid wire is a single-core wire used as an electric fence conductor. Solid wire is available in different sizes and materials.
Various different devices used for tensioning of wires on a fence.
Fastening and joining devices:
All joints in electric fencing wire should be done by making use of ferrules or line clamps.
HT cable (or high tension cable) is designed to carry high voltage to and from areas where bare fencing wires cannot be used. It is used to carry energy from the energizer to the fence wire, and from the fence onto the earth spikes. HT cable is available in different lengths, and different materials.
Earth loops are used to enhance the level of security offered by an electric fence by detecting attempted separation of fence wires. By creating a connection between 2 live wires and leaving just enough room for natural movement of the earth wire, the alarm will sound as the earth wire touches the earth loop.
Gate contacts are used for sliding gates only. Gate contacts pick up live energy from the fence and energize the fence wire on top of the gate.
Warning signs, sirens and flashing lights are used in electric fence installations to make people aware of the fence high voltage as well as alarm generation.
For an electric fence to be effective, the circuit has to be completed. When an intruder touches the fence, the circuit is completed through the ground or earth wires. The current flows back via the earth spikes to the energizer unit.
When lightning strikes close to (or directly on) an electric fence, it causes a massive surge in voltage which flows back to your energizer to find the quickest path to earth. One form of lightning protection is to install Nemtek’s Lightning Diverter Kit. The kit creates a blocking effect for the extremely high voltages caused by lightning.
An electric fence energizer converts mains or battery power into a high voltage pulse. The energizer releases this pulse through an insulated wire onto the fence line approximately once every second. The pulse is commonly referred to as the shock which is felt when one makes contact with the fence.
The power created by an energizer, is measured in Joules, which is a combination of Amps, Volts and impulse duration. The Joule-rating differs between stored energy and pulsed (output) energy. The power quoted on all Nemtek energizers, is based on the output energy, which is the effective power supplied on the fence.
Resistance is measured in ohms (Ω).
SANS is an abbreviation for South African National Standards and is derived from the international IEC60335-2-76 standards on electric fencing and related subjects. We design our products around the SANS60335-2-76 requirements.