6
Use high voltage lead-out cable in buildings to effectively insulate from the
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earthed structural parts of the building and where soil could corrode exposed
galvanised wire. Do not use household electrical cable.
Connecting leads that are run underground shall be run in conduit of insulating
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material or else insulated high voltage lead-out cable shall be used. Care must
be taken to avoid damage to the connecting leads due to the effects of animal
hooves or tractor wheels sinking into the ground.
Connecting leads shall not be installed in the same conduit as the mains supply
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wiring, communication cables or data cables.
Connecting leads and electric animal fence wires shall not cross above overhead
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power or communication lines.
Crossings with overhead power lines shall be avoided wherever possible. If such
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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
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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 V
Clearance M
Less than or equal to 1 000
Greater than 1 000 and less than or equal to 33 000
Greater than 33 000
3
4
8
If connecting leads and electric animal fence wires are installed near an overhead
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power line, their height above the ground shall not exceed 3m.
This height applies either side of the orthogonal projection of the outermost
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conductors of the power line on the ground surface, for a distance of:
2m for power lines operating at a nominal voltage not exceeding 1000V;
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15m for power lines operating at a nominal voltage exceeding 1000V.
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Electric animal fences intended for deterring birds, household pet containment or
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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,
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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.
Fence wiring should be installed well away from any telephone or telegraph line
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or radio aerial.
Ensure that all mains operated, ancillary equipment connected to the electric
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animal fence circuit provides a degree of isolation between the fence circuit and
the supply mains equivalent to that provided by the energizer.
Where an electric animal fence crosses a public pathway, a non-electrified gate
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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.
