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Connecting Earth Ground to a QFX5100 Device

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the QFX5100 device to earth ground before you connect it to power.

For installations that require a separate grounding conductor to the chassis, you must attach a protective earthing terminal bracket on the QFX5100 device left front mounting bracket to connect to the earth ground (see Figure 1).

Before you connect earth ground to the protective earthing terminal of a QFX5100 device, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable.


Using a grounding cable with an incorrectly attached lug can damage the switch.


Mount your switch in the rack or cabinet before attaching the grounding lug to the switch. See Mount a QFX5100 Device in a Rack or Cabinet.

Ensure that you have the following parts and tools available:

  • Protective earthing terminal bracket—This bracket attaches to the QFX5100 switch chassis through the left front mounting bracket, providing a protective earthing terminal for the switch.

  • Grounding cable for your QFX5100 device—The grounding cable must be 14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code.

  • Grounding lug for your grounding cable—The grounding lug required is a Panduit LCD10-10A-L or equivalent.

  • Two SAE 10-32 washers and screws—To attach the grounding lug to the protective earthing terminal.

  • Screwdriver to attach the screws.

An AC-powered QFX5100 switch chassis gains additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using an AC power cord appropriate for your geographical location. See AC Power Cord Specifications for a QFX Series Device.

To connect earth ground to a QFX5100 device:

  1. Attach one end of the grounding cable to an appropriate earth ground site, such as the mounting rack.
  2. Position the grounding lug over the protective earthing terminal on the side of the chassis, which is visible through the mounting bracket.
  3. Secure the grounding lug to the protective earthing terminal with the washers and screws. See Figure 1 and Figure 2.
    Figure 1: Connecting a Grounding Cable to a 1 U QFX5100 DeviceConnecting a Grounding Cable to a 1 U QFX5100 Device
    Figure 2: Connecting a Grounding Cable to the 2 U QFX5100-96S DeviceConnecting a Grounding Cable to the 2 U QFX5100-96S Device
  4. Dress the grounding cable and ensure that it does not touch or block access to other device components and that it does not drape where people could trip over it.