1. How can a fence be financed?
Elf provides the funding to install the fence. Elf then calculates a repayment
schedule and adds the cost of maintenance and insurance
to this figure.
2. Why finance a fence?
Fences that are not financed often fall into disrepair and the original
installer is nowhere to be found. Elf has vested interest in a financed
fence because if it does not work, the client can withhold payment. In
addition, the incentive for Elf to build up a top quality fence is high
since it has committed to a fixed cost maintenance program i.e. any
additional costs are for Elf’s account.
3. How long does the contract last?
Typically 60 months, although this is structured to meet the client’s
4. What other costs does the Client incur?
None. Elf is contractually obliged to fix the fence at its own costs. Elf
takes out comprehensive insurance for this which is included in the
5. What happens if the fence is cut in the middle of the night?
Elf is on duty 24 hours a day. As soon as Elf is notified, a technician will
be sent out to repair the fence. If a vehicle has been driven through the
fence, Elf will make provision for a guard to be placed at the breach
until it is properly repaired.
6. When considering an electric fence installation, what is important?
- Spacing of strain poles and intermediates posts
- Spacing of wires
- Type of wire
- Method of monitoring
7. How does an Alarmed Perimeter Fence work?
There are two types of alarmed fences:
- Electrified High Voltage fence with a maximum of 10,000 volts, and
- Electrified Low Voltage fence with a maximum of 36 volts
Each of these fences work in the same way – a current is induced into
the fence and the return voltage is measured to determine whether the
fence has been cut or short circuited. The high voltage fence gives the
intruder a shock, whereas the low voltage fence does not.
8. Wiring and Configuration
There are a number of types of wire to use namely aluminium, galvanized steel,
galvanized braided steel and stainless steel. These come in various thicknesses and
have different characteristics. The resistance of the wire is of great importance
when installing electric fencing.
A fence can be wired in two configurations namely parallel or series. The
series wiring configuration offers the greater protection for security purposes
as the cutting of the fence is more easily detected. The parallel configuration is
used when the security threat is low or when the fence resistance has to be
9. Alarm Reporting
Longer fences are generally divided into zones so that the guard can
identify the area breached and respond accordingly. Systems are set up to
detect the breaches in a number of ways namely hard wired zones, resistance
configured zones or comparative current flow detection zoning. It is important
to ensure that the system accurately indicates the area breached and indicates
the correct zone if a number of zones are breached in succession.
10. Reaction to Alarms
An alarmed perimeter is only as good as the response to the alarm. A clear
document of procedure should be drawn up detailing the procedure of events
in the case of an alarm being raised.
11. Alarm Testing
All zones on the fence should be tested regularly, checking to see that signals
are received at the guardhouse as well as the control room of the armed
response provider. Alarms should be logged and signed off by the relevant
12. Monitoring and Maintenance
Electrified fences are dynamic installations that require maintenance. In order
to ensure that the required maintenance is done before the criminal finds out
that the system is not working, the fence must be monitored. A program or
procedure should be followed to ensure that the system is fully functional.