The live wire of permanent systems must be taken either over or under gateways. Under is more satisfactory, as overhead wires can be brought down. Dig a trench at least 400mm (16″) deep, and use a length of electric fencing underground cable, encased in a high density polythene pipe. Install it as shown, with the ends of the pipe turned down to prevent water getting in. Do not use ordinary fence wire, as it will corrode.
Some people advise leaving a section of about 3m either side of any gateway unelectrified, to make it easier to move large numbers of stock through it. If electrified to the edge of the gateway, stock may be wary and difficult to drive through. This is not essential, but may be useful in some circumstances. It may also be advisable where walkers and horse riders frequently use the gateway, to prevent accidental shock.
In some situations the gate itself may need electrifying, to stop stock rubbing and damaging the gate. A single scare wire can be run right around the gate, flexing at the hinged end. All electric paddocks should include separate rubbing posts, to allow animals to rub themselves.
Alternatively, the gate itself can be part of the electrified barrier. Although some farmers claim that stock are difficult to move through gateways which are sometimes electrified, others have found that there is no problem once the gate is swung back.
- A spring gate is a simple and economical gate for electric fences, comprising a high tensile steel spring with an insulated handle.
A single spring, as shown, is suitable for horse or cattle fences. For multi-wire fences, several springs are suitable for infrequently used gateways, but for frequent use, lightweight galvanised mesh gates are more practical. - Lightweight electric gates in a selection of widths are available from Bryce Electric Fencing and from Bramley and Wellesley.
- Swing gate. This is pushed open by a vehicle driving through, and then swings back to close. It is a cheap alternative to a cattle grid at frequently used access points. There is no chance of getting a shock when driving through, because the tyres provide insulation, but these gates do tend to deter drivers who are not used to them! The gates must be driven through slowly or they will get damaged. Insulated handles are provided for pedestrian use. Available from Gallagher.
Water gate
This consists of lengths of vertical electrified wires, suspended over the stream bed or gully to keep it stock proof. When the stream or river is in spate, a resistor isolates the power from the water gate. Very long gates of 50m or more can be installed to span wide, shallow river beds. Available from Bryce Electric Fencing.
