12
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 energizers or from independent fence
circuits of the same energizer.
For any two separate electric animal fences, each
supplied from a separate energizer independently
timed, the distance between the wires of the two
electric animal fences shall be at least 2.5 m (8’). 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 energizer.
A non-electrified fence incorporating barbed wire or
razor wire may be used to support one or more off-
set 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
10.
A distance of at least 10 m (33’) shall be
maintained between the energizer 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
Clearance
1000 V
3 m (10’)
1000 V to
33,000 V
4 m (13’)
33,000 V
8 m (27’)
If connecting leads and electric animal fence wires
are installed near an overhead power line, their
height above the ground shall not exceed 3 m
(10’). This height applies to either side of the
orthogonal projection of the outermost conductors
of the power line on the ground surface, for a
distance of:
2 m (6’6‛) for power lines operating at a
nominal voltage not exceeding 1000 V.
15 m (50’) for power lines operating at a
nominal voltage exceeding 1000 V.
Electric animal fences intended for deterring birds,
household pet containment or training animals such
as cows need only be supplied from low output
energizers to obtain satisfactory and safe
performance.
In electric animal fences intended for deterring birds
from roosting on buildings, no electric fence wire
shall be connected to the energizer earth electrode.
A warning sign shall be fitted to every point where
persons may gain ready access to the conductors.
Where an electric animal fence crosses a public
pathway, a non-electrified gate shall be
incorporated in the electric animal fence at that
point or a crossing by means of stiles shall be
provided. At any such crossing, the adjacent
electrified wires shall carry warning signs.
