patura P20 Mode D'emploi page 35

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 elec-
trified 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. For safety reasons we recommend on
offset fences only to use energisers with a maximum of 5 joules output energy.
Follow our recommendations regarding earthing. See "Installing and testing an earth system"
on page 33.
A distance of at least 10 m (33') shall be maintained between the energiser earth stake 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 fence wires shall not cross above overhead power or communi-
cation 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 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 fences
Power line voltage
≤ 1.000 V
> 1.000 ≤ 33.000 V
> 33.000 V
If connecting leads and electric 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:
Clearance
3 m (10')
4 m (13')
8 m (27')
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