Emerson Process Management ControlWave EFM 3808 - Manual (Page 274)

S1400CW Page 3-6 Section 3 - Grounding & Isolation
Ground, it is recommended that the unit’s Chassis Ground Terminal be connected to a
conductive mounting panel or plate, a user supplied Ground Lug or a user supplied Ground
Bus. The panel, lug or bus in turn must be connected to a known good Earth Ground via a
#4 AWG wire.
General Considerations
The following considerations are provided for the installation of ControlWave system
grounds:
i 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.
i This ground wire should be clamped or brazed to the Ground Bed Conductor (that is
typically a stranded copper AWG 0000 cable installed vertically or horizontally).
i The wire ends should be tinned with solder prior to installation.
i The ground wire should be run such that any routing bend in the cable has a
minimum radius of 12-inches below ground and 8-inches above ground.
The units Earth Ground Cable should be clamped to an exposed Ground Rod or to an AWG
0000 stranded copper Ground Cable that in turn should be connected to either an Earth
Ground Rod or Earth Ground Bed. Both ends of the units Earth Ground Cable must be free
of any coating such as paint or insulated covering as well as any oxidation. 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) it should be covered or coated to protect it from the environment.
3.3.3 Other Grounding Considerations
Figure 3-6 - Grounding of Phone Line