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Figure 3-10 Ground through an AC power PE wire
(1) Three-wire AC power input cable
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 3-11 Ground through the PGND of a power cabinet
(5)
(7)
(6)
(8)
(9)
(10)
(11)
(1) DC power input
(5) AC/DC power cabinet
(9) RTN
(1)
(4)
(2) Switch rear panel
(6) –48V strip
(10) PGND strip
3-7
(2) Switch rear panel
(2)
(3)
(3) Grounding screw
(7) –48V
(11) Grounding
(4) PGND cable
(8) RTN strip
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