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.
At one end of the ground
wire, strip the insulation to expose 12 mm (1/2 in) of bare wire.
Insert the stripped wire
into the grounding lug.
Using a straight-tip
torque screwdriver, tighten the retaining screw to 2.25 N m (20
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.