Grounding the Switch Chassis

Before installing DC power supply units in your switch, perform these steps:

  1. Verify that the DC circuit is de-energized.
  2. Identify the grounding lug on the rear of the switch.
    The grounding lug is identified by the international symbol for earth ground:
  3. Attach the ground wire to the grounding lug as follows.
    Use stranded copper wire, sized between 14 AWG and 6 AWG.
    1. At one end of the ground wire, strip the insulation to expose 12 mm (1/2 in) of bare wire.
    2. Insert the stripped wire into the grounding lug.
    3. Using a straight-tip torque screwdriver, tighten the retaining screw to 2.25 N m (20 in‑lb).
  4. Connect the other end of the wire to a known reliable earth ground point at your site.

You can now install one or two DC power supplies, following the steps in Install a 750 W DC Power Supply.

121137-05 Rev. 03