Introduction National Electrical Code Compliance
4
Wire Length
Improper system operation could result in undetected potential environmental and health hazards if the probe- or
sensor-to-console wire runs exceed 1000 feet. Wire runs must be less than 1000 feet to meet intrinsic safety
requirements.
Splices
Veeder-Root recommends that no splices be made in the wire run between a sensor or probe junction box and the
console. Each splice degrades signal strength and could result in poor system performance.
Wire Gauges - Color coded
• Shielded cable must be used in all installations. Sensor-to-console wires should be #14-#18 AWG stranded
copper wire and installed as a Class 1 circuit. As a alternate method when approved by the local authority
having jurisdiction, 22 AWG wire such as Belden 88761 may be suitable in installations with the following
provisions:
- Wire run is less than 750 feet
- Capacitance does not exceed 100 pF/foot
- Inductance does not exceed 0.2 μH/foot
POWER WIRING
• Wires carrying 120 or 240 Vac from the power panel to the console should be #14 AWG (or larger) copper
wire for line, neutral and chassis ground (3); and #12 AWG copper wire for barrier ground.
• Wires carrying 120 Vac from power panel to a Pump Sense Module, Mechanical Dispenser Interface Module, or
Wireless PLLD Controller module should be #14 AWG copper wire.
• Wires carrying 240 Vac from power panel to a Wireless PLLD AC Interface Module should be #12 AWG
copper wire.
SENSOR AND PROBE JUNCTION BOXES
Weatherproof electrical junction boxes with a gasketed cover are required on the end of each probe and sensor
conduit run at the manhole or monitoring well location. Gasketing or sealing compound must be used at each entry
to the junction box to ensure a waterproof junction. The interior volume of each junction box must be a minimum of
16 cubic inches.
Veeder-Root recommends the following junction boxes or equivalent:
• Appleton Electric Co. - JBDX junction box, JBK-B cover and JB-GK-V gasket.
• Crouse-Hinds Co. - GRFX-139 junction box, GRF-10 cover and GASK-643 gasket.
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