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Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 73
0401-046
Figure 32 LT31 Equipment Grounding
WARNING
A lightning strike through the communication wire can cause a
dangerous voltage surge at the remote sites if the remote units are not
properly grounded.
Cable Selection
This section describes the power and signal cabling of LT31. The
customer is responsible for supplying the power and signal cables, and
conduits for the cables. In all field cabling, the following should be
remembered:
- Use armored field cables.
- Cables must be suitable for underground use.
- Check the cable core diameter according to maximum allowable drop,
refer to Table 7 on page 76.
- Lead the cables to the equipment through conduits.
- Check the cable conduit diameters or use additional termination
boxes.
- Ground the cable shield at both ends.
- Use spike and overvoltage protection devices at both ends of the field
cables.
It is recommended to protect the cables by putting a brightly colored,
warning plastic tape into the ground about 0.5 m above the cables and
0.2 m below the ground level.