3-14
In Other Installation Sites
When the switch is AC-powered
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 3-18
Ground through an AC power PE wire
(1) Three-wire AC power input cable
(2) Switch rear panel
When the Switch is DC-powered
For a DC-powered switch, if neither of the first two conditions mentioned above is available, ground the
switch through the return wire (RTN) of the DC power supply. In this case, make sure this RTN wire is
well connected to the ground at the DC output of the DC power cabinet.
Figure 3-19
Ground through the PGND of a power cabinet
(1) DC power input
(2) Switch rear panel (3) Grounding screw
(4) PGND cable
(5) AC/DC power cabinet (6) –48V strip
(7) –48V
(8) RTN strip
(9) RTN
(10) PGND strip
(11) Grounding
