CCTV & Security
How Electric Fences Work: Types, Safety and What Affects the Cost
Short answer
An electric fence uses an energiser that sends short, high-voltage, low-current pulses along wires. Anyone touching the wire receives a deterrent shock and the system can trigger an alarm. Cost depends on the perimeter length, number of wire strands, energiser size, gates, alarm and backup battery, so a site visit is needed for an accurate quote.
How it works
The energiser charges and releases brief pulses into a circuit of insulated wires. A properly designed fence is a deterrent and alarm, not a lethal device. When the circuit is touched or cut, the energiser can sound a siren or alert you.
Common types
- Wall-top fence: Wires on insulated brackets along the top of a perimeter wall. Most common for homes and compounds.
- Freestanding fence: Posts and wires for open land, farms or perimeters without walls.
- Gate and corner protection: Extra wires or sensors at weak points.
Safety essentials
- Use a certified energiser designed for security fencing.
- Fit warning signs along the full perimeter.
- Keep vegetation and objects off the wires.
- Earth the system properly and keep wiring away from other fences.
- Add a backup battery so the fence works in power cuts.
What affects the cost
- Perimeter length and number of wire strands.
- Energiser size and brand.
- Number of corners, gates and levels.
- Alarm, siren, keypad and phone alerts.
- Backup battery capacity.
- Wall condition and mounting type.
Maintenance
Check wires, insulators and earthing regularly, trim vegetation and test the alarm. Pair the fence with CCTV for stronger security.
Common questions
Is an electric fence safe?
A correctly installed security fence uses a certified energiser giving pulses, not continuous current. Warning signs and good installation are essential.
Will it work in a power cut?
Yes, with a backup battery. Its size decides how many hours it lasts.
Can I add solar to power it?
Yes. A small solar panel and battery can run an energiser and keep the battery charged.