For proper operation and safety, all powered rackmounted equipment must be properly grounded. All PDUs, branch wiring, and receptacles must be listed as grounding-type devices. Connect each component and PDU into reliably grounded outlets.
Caution - To reduce the risk of electric shock or damage to installed equipment, never disable the grounding plug on any power cord.
For additional grounding, attach an earth ground cable to the rack. See Attaching a Grounding Cable for instructions.