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42 CHAPTER 2: INSTALLING THE SWITCH 7750
Connecting the
Ground Wire
To connect the ground wire:
1 Wear an antistatic wrist strap.
2 Remove the screw from the grounding hole in the switch chassis.
3 Set the ground wire connector around the grounding screw.
4 Fasten the grounding screw in the hole on the chassis.
5 Connect the other end of the ground wire to the grounding bar of the switch.
If you install the switch in a cabinet, 3Com recommends that the ground wire of
the switch be connected to the grounding bar of the cabinet.
WARNING: The resistance between switch chassis and the ground should be less
than 1 ohm.
Connecting and
Configuring Power
The Switch 7750 requires power connection from the AC or DC power source and
from the PoE power rack.
Connecting AC Power
Cords
To connect AC power cords:
1 Power off all the related parts of the switch before connecting the AC power cord
2 Plug the power cords into the sockets in the switch and attach the retention clips
to the power cord plugs.
3 Plug the other end of the cords into a socket strip with surge protector. Connect
the strip to the power source in the room.
Figure 32 illustrates the AC power cord connection.
Figure 32 AC Power Cord Connection
1 AC power sockets
2 Retention clips
3 Grounding screw
WARNING: For surge protection, the power should be channelled through an
external protection device into the Switch 7750.