Bi-Polar Option; Cabling; Lightning Protection; Earth Loop Monitoring - JVA Z14 Installation And User Manual

JVA ELECTRIC FENCE SYSTEMS

4.9 Bi-Polar Option

The Bi-Polar fence is made up of alternating positive (+ve) and negative (-ve)
wires instead of live and earth. Bi-Polar has the benefit, for security purposes,
that all wires on the fence are live with respect to earth, so every wire gives a
shock, and anything touching both wires receives a larger shock. The trade-off
is that the voltage on each set of wires to earth is approximately half that of a
conventional fence's live wires. The voltage between the wires is the same as that
of a conventional fence. To set a Z14 to Bi-Polar mode, the unit must be modified
by a JVA Technical Centre.
The fence feed and return connections are wired differently for Bi-Polar mode
compared to Conventional mode.
For diagrams showing how to connect the Z14 to a fence, see section 5.3, page
14.
NOTE: In Bi-Polar particular mode, the display shows return voltages only for each
circuit. e.g. Return voltages showing 4.3 and 3.9 mean a total voltage of 8.2 kV.

4.10 Cabling

High voltage cabling (fence lead out and returns) should be run using suitably
rated cable. Double insulated electric fence "underground" cable is suitable. High
voltage cables must never be run within the same conduit as low voltage cables.
A minimum distance of 100mm should be kept between high voltage and low
voltages cables.

4.11 Lightning Protection

Although the Z14 contains internal lightning protection elements, external lightning
protection elements such as additional external lightning protection kits are recom-
mended to further reduce lightning damage and thus reduce repair costs. They are
available from your local dealer.

4.12 Earth Loop Monitoring

The Z14 has two fence earth terminals. If the earth monitoring facility is not
required, the Earth Out and Earth Return terminals must be joined with a wire
bridge. The earth terminals must be connected to the earth spikes as close to the
energizer as possible. In most installations these may be joined and only one wire
used to connect to the earth. Directions on how to wire for earth loop monitoring
are in section 5.3, page 14.
NOTE: In this particular mode, i.e. earth monitoring mode, the fence earth loop
must be connected to the ground earth spikes at only one location (close to the
energizer).
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