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Rocky soil can pose many grounding problems, probably requiring a counterpoise or copper plate.
Constructing a trench at the grounding site and mixing the fill with a hygroscopic salt such as
calcium chloride may help for a time. Soaking the trench with water on a regular basis also
maintains conductivity.
If your site uses a phone modem, you must use a lightning arrester located at the point at which
the communication line enters the building.
Figure 3-5: Poor Soil Ground Bed Construction Diagram
3.3.2
Ground Wire Considerations
Controllers and flow computers are provided with a ground lug. Consult the instruction manual for
the specific device for the proper wire size. You must run a ground wire between the chassis
ground lug and a known good earth ground. The cases of the various modules are automatically
connected to the chassis ground when they have been installed and secured in the chassis.
Grounding and Isolation
Site Considerations for Equipment Installation, Grounding, and Wiring Manual
D301452X012
September 2019
11
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