Preparation of trenches
Page 98 OmniTrax Product Guide
• Mark the locations for the red bands, the sensor cable overlaps, ferrite beads, decouplers and
terminators in accordance with the site plan.
• Limit any change in the grade of the cable path to 30° or less.
• Make gradual turns around corners.
• Remove any stones or debris from inside or close to the trenches/slots.
• Ensure there are no sharp edges inside the slots.
• Make sure the red bands line up side by side at the designated start point.
• Make sure the decouplers line up side by side at the designated end point.
Preparation of trenches
This section details the procedures for preparing trenches in soft mediums including soil and
gravel, as well as soft mediums under thin layers of concrete or asphalt.
Micro-trenching is a valid installation option for soil and asphalt, and can be used provided that the
trench depths and backfill requirements are maintained (e.g., the 7.5 cm stone dust layers above
and below the cable). Micro-trenching cannot be used in heavy clay soil, as installation in heavy
clay requires significant soil replacement around the cables.
Required equipment
• landscape marker paint
• measuring tape
• pick, shovels and rakes
• trenching machine
• concrete saw (for installation in trench under concrete/asphalt)
• OmniTrax sensor cable sets (as required)
• non-woven geotextile fabric and stone dust or sand (required for rocky soil, or heavy clay
installations)
Note Cable marker tape is included with the sensor cables as a precaution,
and should be used in situations where future gardening or landscaping
activities may occur near the sensor cable route. The use of marker
tape is optional for other types of installations.
Note Dig only as many trenches as can be backfilled in one day.
Note Senstar recommends using a sand bedding and geotextile fabric for
installations in coarse gravel.
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