Grounding the Switch Chassis

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

Verify that the DC circuit is de-energized.
Identify the grounding lug on the rear of the switch.
The grounding lug is identified by the international symbol for earth ground:
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).
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 Installing a 750 W DC Power Supply.