Probe and Sensor Conduit Installation
Wiring Run Methods
15
Figure 7. Example Probe Wiring Run in Buried Rigid Conduit
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 by the authority having jurisdiction 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 8].
If you decide upon the direct burial method, consult the direct burial cable installation manual for detailed
installation instructions (reference manual 576013-858).
LEGEND FOR NUMBERED BOXES IN Figure 7
1.
Weatherproof junction box with 1/2-inch N.P.T. threads (16
cubic inch minimum)
2.
Cord grip seals
3.
Splice Closure
4.
Seal-Off
5.
Epoxy seal per NFPA spec
6.
1/2'' rigid conduit (to console)
7.
Tank
022-12
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