Tru-Test speedrite Delta Mains Manuel D'instructions page 9

Gates in electric security fences shall be capable of
being opened without the person receiving an electric
shock.
An electric security fence shall not be supplied from
two separate energizers or from independent fence
circuits of the same energizer.
For any two separate electric security fences, each
supplied from a separate energizer independently
timed, the distance between the wires of the two
electric security fences shall be at least 2.5 m. 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.
Follow our recommendations regarding earthing. See
Installing and testing an earth system on page 4.
The distance between any electric security fence earth
electrode and other earth systems shall not be less than
2 m, except when associated with a graded earth mat.
Note: Where possible this distance should be at least
10 m.
Exposed conductive parts of the physical barrier shall be
effectively earthed.
Where an electric security fence passes below bare
power line conductors, the highest metallic element
shall be effectively earthed for a distance of not less
than 5 m on either side of the crossing point.
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 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 security 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 security fence wires are
installed near an overhead power line, the clearances
shall not be less than those shown in the table on
page 6.
If connecting leads and electric security 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 projection 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 1,000 V.
15 m for power lines operating at a nominal
∆
voltage exceeding 1,000 V.
A spacing of 2.5 m shall be maintained between
uninsulated electric security fence conductors or
uninsulated connecting leads supplied from separate
energizers. This spacing may be less where conductors
or connecting leads are covered by insulating sleeving,
or consist of insulated cables rated to at least 10 kV.
This requirement need not apply where the separately
energized conductors are separated by a physical
barrier that does not have any openings greater than
50 mm.
A vertical separation of not less than 2 m shall be
maintained between pulsed conductors fed from
separate energizers.
Electric security fences shall be identified by
prominently placed warning signs.
The warning signs shall be legible from the secure area
and the public access area.
Each side of the electric security fence shall have at
least one warning sign.
Warning signs shall be placed:
at each gate
∆
at each access point
∆
at intervals not exceeding 10 m
∆
adjacent to each sign relating to chemical hazards
∆
for the information of the emergency services
Any part of an electric security fence that is installed
along a public road or pathway shall be identified at
frequent 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 x 200 mm.
The background colour of both sides of the
∆
warning sign shall be yellow. The inscription on
7