Site Considerations for Equipment Installation, Grounding, and Wiring Manual
D301452X012
October 2019
12 Grounding and Isolation
General Considerations
The following considerations are provided for the installation of controller/flow computer system
grounds:
▪
Size of ground wire (running to earth ground) should be #4 AWG. It is recommended that
stranded copper wire is used for this application and that the length should be as short as
possible.
▪
Clamp or braze this ground wire to the ground bed conductor (which is typically a stranded
copper AWG 0000 cable installed vertically or horizontally).
▪
Run the ground wire so that any routing bend in the cable has a minimum radius of 12 inches
below ground and 8 inches above ground.
Clamp the unit earth ground cable to an exposed ground rod or to an AWG 0000 stranded copper
ground cable that is in turn connected to either an earth ground rod or earth ground bed. Both
ends of the unit earth ground cable must be free of any oxidation as well as any coating such as
paint or insulated covering. The connecting point of the ground rod or AWG 0000 ground cable
must also be free of any coating and free of oxidation. Once the ground connection has been
established (at either the ground rod or ground cable) cover or coat it to protect it from the
environment.
3.3.3 Other Grounding Considerations
For applications employing equipment that communicates over telephone lines, a lightning
arrester must be provided. For indoor equipment the lightning arrester must be installed at the
point where the communication line enters the building, as shown in Figure 3-6. The ground
terminal of this arrester must connect to a ground rod and/or a buried ground bed.
Figure 3-6: Grounding of Phone Line
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