Probe and Sensor Conduit Installation Wiring Run Methods
18
CAUTION: Since wires for multiple sensors may enter the console through a single conduit, it is recommended
that you use a different color-code for each wire or individually mark each wire to identify sensor inputs. Also, if the
intrinsically safe wires enter the building in a wiring trough, only Veeder-Root intrinsically safe wire can be in the
trough. Keep all low power (intrinsically safe) wiring isolated from high power wires in all wiring troughs.
DIRECT BURIAL CABLE
An alternative to trenching through existing pavement is to use direct burial cable. Before considering the direct
burial method, check to be sure that direct burial practices are acceptable at this location. The direct burial method
requires grinding using an abrasive wheel, a 1/4” to 3/8” wide by 1-1/4” deep groove (adding 1/4” of depth for
each additional cable) in the pavement surface, laying Veeder-Root supplied direct burial cable down in the bottom
of the groove, laying an expanded polyethylene foam backer rod over the cable(s), and then a placing a 1/4” to 1/
2” bead of silicone sealant over the backer rod to within a minimum of 3/8” below the pavement surface [see
Figure 16].
If you decide upon the direct burial method, consult the direct burial cable installation manual for detailed
installation instructions (reference manual 576013-858).
Figure 16. Example Probe Wiring Run Via Direct Burial Cable
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CONCRETE
ASPHALT
EARTH
Grade
Epoxy filled
splice
enclosure
Cord grip
890-SL silicone sealant
SOF ROD backer rod
Seal-off
Rigid conduit
1
2
1
2
Dow Corning Silicone Pavement Sealant
Expanded polyethylene foam rod - trademark of
Applied-Extrusion Technologies.
Splice closure
3'' Min.
Drill oversized hole
in manhole for DB cable
Tank
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