Sun Rack II power distribution units (PDUs) achieve earth ground through their power cords. Final chassis ground is achieved when the power cord is connected to a receptacle, where the ground prong contacts the power receptacle.
For additional grounding, you can attach a chassis earth ground cable to the rack. The additional ground point will allow current leakage to dissipate more efficiently.
Caution - The PDU power input lead cords and the ground cable must reference a common earth ground. Otherwise, a difference in ground potential can be introduced.
Note - A grounding cable is not shipped with the system.
Caution - If you are unsure of the facility PDU receptacle grounding, do not install a ground cable until a proper PDU receptacle grounding has been confirmed. If a difference in ground potential is apparent, you must take corrective action.
The facility PDU must be earth ground.
Caution - During manufacturing, the ground cable attachment area might be a painted surface. Ensure that metal-to-metal solid contact is made for this installation.
Figure 2-7 Earth Ground Attachment Bolt Location