Grounding the chassis

Installing an HCP SAIN System - Final On-Site Setup

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The switch chassis is automatically grounded when you properly install the switch in a grounded rack with metal-to-metal connections between the switch and rack. You can also ground the chassis, which is required if the rack is not grounded, by attaching a customer-supplied grounding cable. Attach the cable to the chassis grounding pad and the facility ground.

Before you can ground the chassis, you must have a connection to the earth ground for the data center building.
Note: An electrical conducting path shall exist between the product chassis and the metal surface of the enclosure or rack in which it is mounted or to a grounding conductor. Electrical continuity shall be provided by using thread-forming type mounting screws that remove any paint or non-conductive coatings and establish a metal-to-metal contact. Any paint or other non-conducting coatings shall be removed on the surfaces between the mounting hardware and the enclosure or rack. The surfaces shall be cleaned and an antioxidant applied before installation.
Note: Statement 1024—Ground Conductor. This equipment must be grounded. To reduce the risk of electric shock, never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available.
Note: Statement 1046—Installing or Replacing the Unit. To reduce risk of electric shock, when installing or replacing the unit, the ground connection must always be made first and disconnected last.
  1. Use a wire-stripping tool to remove approximately 0.75 inch (19 mm) of the covering from the end of the grounding wire. We recommend 6-AWG wire for the U.S. installations.
  2. Insert the stripped end of the grounding wire into the open end of the grounding lug. Use a crimping tool to crimp the lug to the wire, see the following figure. Verify that the ground wire is securely attached to the grounding lug by attempting to pull the wire out of the crimped lug.

    • 1. Chassis grounding pad
    • 2. Grounding cable, with 0.75 in. (19 mm) of insulation that is stripped from one end, which is inserted into the grounding lug and crimped in place
    • 3. 2 M4 screws are used to secure the grounding lug to the chassis
  3. Secure the grounding lug to the chassis grounding pad with two M4 screws, see the previous figure. Tighten the screws to 11to 15 in-lb (1.24 to 1.69 N·m) of torque.
  4. Prepare the other end of the grounding wire and connect it to the facility ground.