energiser, and that is independent of other earthing
arrangements.
Connecting lead – An electric conductor, used to
connect the energiser to the electric fence or the earth
electrode.
Electric animal fence – An electric fence used to
contain animals within or exclude animals from a
particular area.
Electric security fence – A fence used for security
purposes which comprises an electric fence and a
physical barrier electrically isolated from the electric
fence.
Physical barrier – A barrier not less than 1.5 m (5')
high intended to prevent inadvertent contact with the
pulsed conductors of the electric fence. Physical
barriers are typically constructed from vertical
sheeting, rigid vertical bars, rigid mesh, rods or
chainwire mesh.
Public access area – Any area where persons are
protected from inadvertent contact with pulsed
conductors by a physical barrier.
Pulsed conductors – Conductors which are subjected
to high voltage pulses by the energiser.
Secure area – The side of an electric security fence
where a person may come into contact with the
electric fence, without the protection of a physical
barrier.
Requirements for electric animal fences
Electric animal fences and their ancillary equipment
shall be installed, operated and maintained in a
manner that minimises danger to persons, animals or
their surroundings.
Electric animal fence constructions that are likely to
lead to the entanglement of animals or persons shall
be avoided.
An electric animal fence shall not be supplied from
two separate energisers or from independent fence
circuits of the same energiser.
For any two separate electric animal fences, each
supplied from a separate energiser independently
timed, the distance between the wires of the two
electric animal fences shall be at least 2 m (6'6"). If
this gap is to be closed, this shall be effected by
means of electrically non-conductive material or an
isolated metal barrier.
Barbed wire or razor wire shall not be electrified by an
energiser.
A non-electrified fence incorporating barbed wire or
razor wire may be used to support one or more offset
electrified wires of an electric animal fence. The
supporting devices for the electrified wires shall be
constructed so as to ensure that these wires are
positioned at a minimum distance of 150 mm (6")
from the vertical plane of the non-electrified wires.
The barbed wire and razor wire shall be earthed at
regular intervals.
Follow our recommendations regarding earthing. See
Installing and testing an earth system on page 7.
A distance of at least 10 m (33') shall be maintained
between the energiser earth electrode and any other
earthing system connected parts such as the power
supply system protective earth or the
telecommunication system earth.
Connecting leads that are run inside buildings shall be
effectively insulated from the earthed structural parts
of the building. This may be achieved by using
insulated high voltage cable.
Connecting leads that are run underground shall be
run in conduit of insulating material or else insulated
high voltage cable shall be used. Care must be taken
to avoid damage to the connecting leads due to the
effects of animal hooves or vehicle wheels sinking into
the ground.
Connecting leads shall not be installed in the same
conduit as the mains supply wiring, communication
cables or data cables.
Connecting leads and electric animal fence wires shall
not cross above overhead power or communication
lines.
Crossings with overhead power lines shall be avoided
wherever possible. If such a crossing cannot be
avoided it shall be made underneath the power line
and as nearly as possible at right angles to it.
If connecting leads and electric animal fence wires are
installed near an overhead power line, the clearances
shall not be less than those shown in the table below.
Minimum clearances from power lines for electric
animal fences
Power line voltage
≤1000 V
>1000 ≤33,000 V
>33,000 V
Clearance
3 m (10')
4 m (13')
8 m (27')
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