Interference and Induction explained...

INTERFERENCE

Radio and telephone interference problems can occur, particularly in areas with poor radio reception .

Clicking on the radio or telephone can be caused by:

The energizer being too close to the mains power earth.

• A bare earth wire touching the building.
• A poor mains power earth.
• Loose connections in the energizer or plugs..
• The electric fence running parallel to telephone or power lines.
• Poor or rusty joints on the fence line.
• Damaged cut-out switch or cracked insulators.
• A broken cable under a gateway.
• Vegetation arcing / touching the fence
• Any mechanical short.

To detect if the fence is causing the problem disconnect the fence and the earth wires from the energiser and switch the energiser on. If the clicking stops the problem is on the fence line or earth. If the clicking continues then the problem is either in the energiser or the mains power supply. Check the plugs. If the problem is in the mains power supply the clicking will stop immediately the when the energiser plug is pulled. If the problem is in the energiser an extra click will be heard after the energiser plug is pulled.

INDUCTION

Induction is a phenomenon associated with High Voltage wires whereby a small current is transmitted through the atmosphere to adjacent neutral wires. Induction can be detected in an item by using a volt meter, or when the item is touched, one can feel a small shock.

Induced voltage can be detected on :-

Conventional fences carrying offset or lead-out wires

The wire between the strain insulator and the strainer post

Metal gates

Milking parlour railing

Showers

Induction is linked to poor earthing and can be prevented or eliminated by earthing the offending item.

Induction does not affect the voltage on the fence line.