Tru-Test speedrite Delta 1B Instruction Manual page 10

in position. The stay can be levered into position with
a spade.
All-live system
Earth-return system
Horizontal stay
Suitable for field gate, high-tension strainer.
Very simple to erect and most suitable as a high
tension strainer, excellent in areas where the soil gets
very wet or where heavy frost occurs.
Installing and testing an earth system
Select a suitable site for the Earth system. Sites need
to be:
At least 10 m (33') from other earth systems (e.g.
•
telephone, mains power or the earth system from
another energizer).
Away from stock or other traffic that could
•
interfere with the installation.
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At a site that can be easily observed for
•
maintenance.
Ideally at a site that has damp soil (e.g. a shaded
•
or swampy location). Note that the earth does
not need to be directly adjacent to the energizer
installation.
Drive Speedrite earth rods into the ground. Use high-
voltage, insulated cable and earth clamps to
continuously connect the earth rods and the
energizer's Earth terminal. Make sure the insulation is
stripped back to ensure good contact between the
wire and the earth rod. The table below specifies the
minimum number of 2 m (6'6") earth rods
recommended for an earthing system:
Energizer
Delta 1B: 0.5 J
Delta 2B: 1.0 J
Delta 3B: 2.5 J
Test the earth system, using the following procedure:
Turn off the energizer.
1
At least 100 m (330') away from the energizer,
2
short circuit the fence by laying several steel rods
or lengths of pipe against the fence. For best
results, the fence voltage should be lowered to
2,000 V or less. In dry or sandy conditions, it may
be necessary to drive the rods up to 300 mm
(12") into the earth.
Note: It is not acceptable to short-circuit a fence
return system to the earth wire of the fence.
Turn the energizer back on.
3
Using a Speedrite Digital Voltmeter, ensure that
4
the fence voltage is below 2 kV.
Check your earth system. Insert the voltmeter's
5
earth probe into the ground at the full extent of
the lead, and hold the hook against the last earth
rod. The tester should not read more than 0.3 kV.
Anything higher than this indicates that better
earthing is required. Either add more earth rods
or find a better ground area to drive in the earth
rods.
Note: When earthing energizers located in dairies,
earth at least 20 m (65') away from the dairy using
double-insulated wire to avoid touching the dairy
building or equipment.
Earth rods
1
2
3