Attaching an Optional Ground Cable

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.

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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.

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Attach a Ground Cable

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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.

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1. Ensure that the installation site has properly grounded facility PDUs in the data center.

   The facility PDU must be earth ground.

2. Ensure that all grounding points (raised floors and power receptacles) reference the facility PDU ground.

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   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.

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3. Attach the ground cable to one of the attachment point located at the bottom rear of the system frame as shown in Earth Ground Attachment Bolt Location.

   The attachment point is an adjustable bolt that you can find just inside the rear of the rack on the right side.

   
   

   Figure 2-7 Earth Ground Attachment Bolt Location