Any part of an electric fence which is installed along a public road or pathway shall be
identified at frequent intervals by prominently placed warning signs securely fastened to
the fence posts or firmly clamped to the fence wires. The size of the warning signs shall be
at least 100mm x 200mm. The background colour of both sides of the warning plate shall
be yellow. The inscription on the plate shall be in black.
The warning sign shall typically appear as depicted in the figure below. The inscription
shall be indelible, inscribed on both sides of the warning plate and have a height of at least
25mm.
Warning signs shall be placed at;
•
each gate
•
each access point
•
intervals not exceeding 10m
•
adjacent to each sign relating to chemical
hazards for the information of emergency services.
Gates in electric security fences shall be capable of being opened without the person
receiving an electric shock.
The energizer earth electrode shall penetrate the ground to a depth of at least 1m. The
distance between any electric security fence earth electrode and other earth systems shall
not be less than 2m.
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 a conduit of insulating material
or else insulated high voltage cable shall be used. Care shall be taken to avoid damage to
the connecting leads due to external factors.
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
communication lines.
Mains supply wiring shall not be installed in the same conduit as signaling leads associated
with the electric security fence installation.
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.
Appendix
(continued)
11
