Mag Probe Installation
Wiring Run Methods
26
Two wiring run methods are commonly used for probes - shielded wiring pulled through buried, sealed 1/2-inch
rigid conduit (see Figure 18); or direct burial cable (see Figure 19). The preferred method, especially in new sites
before driveway surfaces are paved, is to pull probe wiring through buried rigid conduit.
RIGID CONDUIT
Pull shielded cable consisting of two conductors, color-coded #14-18 AWG (0.8 - 2.0 mm
2
) 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.
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 TLS2 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.
Figure 18. Example Probe Wiring Run in Buried Rigid Conduit
Legend for numbered boxes
1
Riser cap and cord grip
2
Weatherproof junction box, 16 in
3
minimum
3
Seal off - epoxy seal per NFPA specifications
4
Rigid conduit to building seal off
5
Seal off - epoxy seal per NFPA specifications
6
Splice closure
consoles/tls2/pwrc.eps
6
5
4
3
2
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