Planning the cable path
OmniTrax Product Guide Page 37
Protection of buried cables
Overview
Bury the marker tape, included with the sensor cable set, approximately 7.5 cm (3 in.) above the
sensor cable. If no further landscaping activity is planned along the cable route, the standard burial
depth should provide adequate long term cable protection. However, in areas where digging,
planting, gardening and other landscaping activities including future irrigation changes may occur,
protect the sensor cable with a non-metal barrier. Pressure-treated wood, or PVC conduit cut in
half lengthwise, can be laid over the sensor cables, and will provide additional protection, without
affecting the detection field. Whichever method is used to protect the cables, ensure here is a
minimum of 2.5 cm (1 in.) of native soil, stone dust, or sand between the sensor cable and the
protective barrier.
For sites that have a significant number of burrowing rodents, the entire sensor cable can be
protected by using PVC conduit, provided the conduit is filled with sand. Never put the full length of
a sensor cable inside conduit that is not filled with sand or soil. Cut a slot in the conduit that will
allow the sensor cable to be inserted into the conduit. Place the sensor cable into the conduit, and
fill the conduit with sand. Do not join the adjacent sections of conduit.
Standard cable spacing
1.5 m (5 ft.)
Use standard cable spacing wherever possible as it provides the best
signal to noise ratio and a wide, consistent detection field.
Narrow cable spacing
10 cm (4 in.)
Narrow cable spacing allows OC2 and SC2 sensor cable to be
installed in a single 15 cm (6 in.) wide trench. Use narrow cable
spacing when the required separation distance between sensor
cables and obstacles cannot be accommodated using 1.5 m spacing.
Also use narrow cable spacing for installations in heavy soil types.
Maximum cable spacing
2 m (6.5 ft.)
Use wide cable spacing to protect open spaces where the motions of
an intruder are not restricted by a physical barrier.
Not recommended for use in heavy soil.
Figure 10: Protecting the sensor cable
2.5 cm (1 in.) min.
half-circle of
PVC conduit
wood plank
cable marker tape
sand filled slotted
length of PVC conduit
23 cm
(9 in.)
15 cm
(6 in.)
sensor
cable
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