17
Follow the energizer manufacturer’s recommendations
regarding earthing.
A distance of at least 10 m shall be maintained between
the
energizer earth electrode
and any other with the
earthing system connected parts such as the power
supply system protective earth or the telecommunica-
tion 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 tractor wheels sinking into
the ground.
Connecting leads
shall not be installed in the same
conduit as the mains supply wiring, communication ca-
bles or data cables.
Connecting leads
and
electric animal fence
wires
shall not cross above overhead power or communica-
tion 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 near-
ly 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 Table BB1.
Table BB 1 - Minimum clearances from power lines for electrical animal fences
Power line voltage ( V )
Clearance ( m )
1000
3
> 1000 and 33000
4
> 33000
8
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.
This height applies to either side of the orthogonal pro-
jection of the outermost conductors of the power line on
the ground surface, for a distance of
– 2 m for power lines operating at a nominal voltage
not exceeding 1000 V;
– 15 m 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
electrical animal fences
intended for deterring birds
from roosting on buildings no fence wire shall be groun-
ded if the fence wires are not connected to metal parts.
If one wire is connected with a metal part ( ie a gutter)
or a metal structure of the building these metal parts
must be grounded. A warning sign shall be fitted to eve-
ry point where persons may gain ready access to the
conductors.
Where an
electric animal fence
crosses a public pa-
thway, 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.
Any part of an
electric animal fence
that is installed
along a public road or pathway shall be identified at fre-
quent intervals by warning signs securely fastened to
the fence posts or firmly clamped to the fence wires.
The size of the warning sign shall be at least 100 mm
× 200 mm.
The background colour of both sides of the warning
sign shall be yellow. The inscription on the sign shall be
black and shall be either
– the symbol of Figure BB1, or
– the substance of CAUTION:
Electric fence
.
The inscription shall be indelible, inscribed on both
sides of the warning sign and have a height of at least
25 mm.
Ensure that all mains-operated, ancillary equipment
connected to the electric animal fence circuit provides
a degree of isolation between the fence circuit and the
supply mains equivalent to that provided by the ener-
gizer.
NOTE 1 Ancillary equipment that complies with the re-
quirements relating to isolation between the fence cir-
cuit and the supply mains in Clauses 14, 16 and 29 of
the standard for the
electric fence energizer
is consi-
dered to provide an adequate level of isolation.
Protection from the weather shall be provided for the
ancillary equipment unless this equipment is certified
by the manufacturer as being suitable for use outdoors,
and is of a type with a minimum degree of protection
IPX4.
PART 3:
PROTECTION AGAINST FIRE ANd LIGHTNING
Mounting inside buildings
In case of indoor mounting the fence controller shall
not be installed at places where there is a risk of fire,
eg. barns or stables. Indoor installed connecting leads
having a voltage of more than 1000 V require a special
insulation which is effective with respect to structural
parts connected to earth. This insulation can be achie-
ved by adequate air gaps or with high voltage cable.
The controllers shall be so installed that they are out
of reach of children and not subject to mechanical da-
mage.
Keep off combustible materials
Combustible materials shall be kept away from the
fence wires and the connecting leads. This applies es-
pecially for special applications (cow trainer) or the like
Lightning protection for electric fencers to prevent
fire in/at buildings (page 8-9)
To prevent damages by lightnings the connection lead
to the building, prior to entering the building, must have
a grounded lightning gap. The lightning suppression de-
