Comtech EF Data CPA - Manual (Page 46)

CPA C-Band Indoor Solid State Power Amplifier Revision 1
Connectors and Pinouts MN/CPA-IN.IOM
3–12
3.4.3 Chassis Ground Connector
The AC power connector provides the safety ground.
PROPER GROUNDING PROTECTION IS REQUIRED: The installation instructions require
that the integrity of the protective earth must be ensured and that the equipment shall
be connected to the protective earth connection at all times. Therefore, it is imperative
during installation, configuration, and operation that the user ensures that the unit has
been properly grounded using the ground stud provided on the rear panel of the unit.
A #10-32 stud is provided for connecting a common chassis ground among
equipment.