In Other Installation Sites - 3Com 4210G Series Getting Started Manual

Figure 3-13 Ground the switch by burying the grounding conductor into the earth
(1) Grounding screw
(4) Joint

In Other Installation Sites

For an AC-powered switch, if neither of the above-mentioned two conditions is available, ground the
switch through the PE wire of the AC power supply. Make sure the PE wire is well connected to the
ground at the power distribution room or AC transformer side, the switch PE terminal and the PE wire
are well connected, and the three-wire input cable of the PGND cable is used for the power supply cable.
If the PE wire of the AC power supply is not grounded at the power distribution room or AC transformer
side, report the problem and make reconstructions.
Figure 3-14 Ground through an AC power PE wire
(1) Three-wire AC power input cable
Use the PGND cable provided with the switch to connect the grounding strip in the equipment room.
Otherwise, the grounding effect may not be ensured, which easily causes damage to the switch.
(2) PGND cable
(5) Grounding conductor
(2) Switch rear panel
3-11
(3) Earth
(6) Switch rear panel