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Connect the EX4650 Switch to Earth Ground

 

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect the switch to earth ground before you connect power to the switch. You must install the switch in a restricted-access location and ensure that the chassis is properly grounded at all times.

EX4650 switches have one 2-hole protective earthing terminal on the left panel. The preferred method to ground the EX4650 chassis is to use the protective earthing terminal on the switch chassis. Alternatively, you can use any additional grounding method, such as the grounding wire in the AC power cord if it is available. EX4650 switches are tested to meet or exceed all applicable EMC regulatory requirements with the 2-hole protective grounding terminal connected correctly as described in this topic.

Caution

Ensure that a licensed electrician has attached the appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

Note

The protective earthing terminal on EX4650 switches mounted flush with the front posts of a rack is accessible through the slot on the left rear bracket only if the distance between the front posts and the rear posts is 23 in. (58.5 cm) through 30.25 in. (76.8 cm). The protective earthing terminal on EX4650 switches mounted in a recessed position from the front posts of a rack is accessible through the slot on the left rear bracket only if the distance between the front posts and the rear posts is 25 in. (63.5 cm) through 32.25 in. (81.9 cm). AC-powered switches gain additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using the AC power cord appropriate for your geographical location. For DC-powered EX4650 switches, if you are unable to access the protective earthing terminal, you can connect the grounding cable to the earth ground terminal on the DC power supply.

Before you connect earth ground to a EX4650 switch, ensure that you have the following parts and tools available:

  • Grounding cable:

    • 14 AWG (1.5 mm²), minimum 90° C wire, or as permitted by the local code—not provided

  • Grounding lug:

    • Panduit LCD10-10A-L or equivalent—not provided

  • Screws to secure the grounding lug:

    • Two 10-32 x .25-in. screws with #10 split-lock washers—not provided

  • Number 2 Phillips (+) screwdriver—not provided

  • ESD grounding strap—not provided

To ground the EX4650:

  1. Connect one end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  2. Place the grounding lug attached to the grounding cable over the protective earthing terminal. The protective earthing terminal is located on the left panel (see Figure 1).
    Figure 1: Connect a Grounding Cable to the EX4650
    Connect a Grounding Cable to
the EX4650
  3. Secure the grounding lug to the protective earthing terminal with the screws.
  4. Dress the grounding cable and ensure that it does not touch or block access to other switch components.Warning

    Ensure that the cable does not drape where people could trip over it.