Site Considerations for Equipment Installation, Grounding, and Wiring Manual
D301452X012
September 2019
Grounding and Isolation 11
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.
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