SENSTAR OmniTrax - Trench Dimensions; Digging the Trenches

Preparation of trenches
OmniTrax Product Guide Page 99
Trench dimensions
Digging the trenches
Clear the excavated soil away from the trench to facilitate measuring the trench depth. Adjust any
portions of the trench that are outside the limits specified for the medium. For dual trench
installation, keep the cable spacing (± 5 cm, 2 in.) and burial depth ± 2.5 cm (1 in.) consistent. For
single trench narrow cable spacing, keep the cable spacing to within + 2.5 cm (1 in.) for the full
length of the cable route. There is no minus tolerance for narrow cable spacing (10 cm minimum).
Senstar recommends that the installer build a tool or use a 10 cm wide device (e.g., a work boot)
to ensure that the narrow cable spacing is consistent for the full length of the sensor cables.
Application Width x Depth
Burial in soil (dual trench)
10 cm W x 23 cm D (4 in. x 9 in.)
Narrow cable spacing (single trench)
15 cm W x 23 cm D (6 in. x 9 in.)
Burial in moderate clay soil (dual
trench)
10 cm W x 15 cm D (4 in. x 6 in.)
Burial in moderate clay soil (single
trench)
15 cm W x 15 cm D (6 in. x 6 in.)
Burial in heavy clay soil (narrow cable
spacing)
1 m W x 60 cm D* (3.3 ft. x 2 ft.)
* The trench depth depends on the depth of the
gravel layer required to provide adequate drainage.
Burial in heavy clay soil
(wide cable spacing)
2 m W x 60 cm D* (6.6 ft. x 2 ft.)
* The trench depth depends on the depth of the
gravel layer required to provide adequate drainage.
Burial with stone dust or sand and
geotextile fabric in rocks or crushed
stone
10 cm W x 30 cm D with 7.5 cm sand in trench
(4 in. x 12 in. with 3 in. sand in trench)
Burial under a narrow strip of asphalt
(e.g., road or driveway)
30 cm W x 38 cm D with 7.5 cm stone dust in trench
(12 in. x 15 in.)
Transition from deep trench under
asphalt to trench in soil
30 cm W x 38 cm D with 7.5 cm stone dust in trench
under asphalt sloping to (for standard cable spacing -
10 cm W x 23 cm D {4 in. x 9 in.}) or (for narrow cable
spacing - 15 cm W x 23 cm D {6 in. x 9 in.}) app. 1 m
from the end of the asphalt
Burial under a large asphalt paved
area (with stone dust)
30 cm W x 30 cm D with 7.5 cm stone dust in trench
(12 in. x 12 in. with 3 in. stone dust in trench)
micro-trenching
2.5 to 7.5 cm W x 30 cm D with 7.5 cm stone dust
Transition from concrete slot to trench
10 to 14 mm W x 6 cm D sloping to 23 cm D app. 3 m
from the end of the slot 04 to 0.6 in. W x 2.25 in. D
sloping to 9 in. app. 10 ft. from end of slot)