Veeder-Root TLS-50 Series, Руководство пользователя

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Probe Installation Installing Field Wiring from Probes to TLS-50 Console
13
Installing Field Wiring from Probes to TLS-50 Console
Two wiring run methods are commonly used for probes - Shielded wiring pulled through buried, sealed 1/2” rigid
conduit (discussed in the following paragraphs); or direct burial cable (discussed on page 15).
Buried Rigid Conduit
The preferred method, especially in new sites before driveway surfaces are paved, is to pull probe wiring through
buried 1/2” rigid conduit [Figure 10].
Figure 10. Example Probe Wiring Run in Buried Rigid Conduit
Pull shielded cable consisting of two conductors, color-coded #14-18 AWG stranded copper wire, between the
console and the junction box at each probe location (do not gang wires together). Use single lengths of wire with
no splices to ensure optimum signal strength.
IMPORTANT! Maximum probe-to-console cable length is 1000 feet (305m).
Since wires for multiple probes 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 probe inputs. Also, if the intrinsically
safe wires enter the building in a wiring trough, only intrinsically safe wires (from TLS-50/-50C probes) can be in
the trough. Keep all low power (intrinsically safe) wiring physically isolated from high power wires in all wiring
troughs per the NEC.
WARNING
Probes operate in areas where flammable liquids and explosive vapors may be present.
Improper installation may result in fire or explosion causing serious injury or death.
Practice the following:
1. Read thoroughly and follow the instructions shipped with each probe.
2. Probe wiring conduit must not contain any other wires.
3. Probe wiring and conduits must enter the console only through their designated
areas (see Figure 4).
4. Power and communication wires and conduit must not enter the intrinsically safe
compartment of the console. (see Figure 4).
Cord grip seals
Weatherproof junction
box with 1/2-inch N.P.T.
threads (16 cubic inch
minimum)
Epoxy seal per NFPA spec
probes\pconduit.eps
1/2'' rigid conduit (to console)
Tank
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Seal-Off
Splice Closure