Introduction
National Electrical Code Compliance
2
National Electrical Code Compliance
The following information is for general reference and is not intended to replace recommended National Electric
Code (NEC) procedures. It is important for the installer to understand that electrical equipment and wiring located
in Class I, Division 1 and 2 installations shall comply with the latest appropriate Articles found in the National
Electric Code (NFPA 70), the Automotive and Marine Service Station Code (NFPA 30A), CEC codes and all
applicable local codes.
PROBE- AND SENSOR-TO-CONSOLE WIRING
Wire Type
To ensure the best operating systems available, Veeder-Root
REQUIRES
the use of shielded cable for all probes
and sensors regardless of conduit material or application. In these installations, shielded cable must be rated less
than 100 picofarad per foot and be manufactured with a material suitable for the environment, such as Carol™
C2534 or Belden™ 88760, 8760, 8770 or similar.
Note: Throughout this manual, when mentioning any cable or wire being used for probe and sensor to console
wiring, it will be referring to shielded cable.
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.
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 Class 2 circuits. As an 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
H/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.