Figure 3-8 Grounding Through The Ac Pe Wire; Figure 3-9 Grounding Through The Pgnd Of A Power Cabinet - Huawei Quidway S3900 Series Installation Manual

Installation Manual
Quidway S3900 Series Ethernet Switches
For an AC-powered switch, if none of the above two conditions is available,
ground it through the PE wire of the AC power supply. In this case, make sure this
PE wire is well connected to the ground at the power distribution room or AC
transformer side.
(1) AC-input
(4) PE wire

Figure 3-8 Grounding through the AC PE wire

For a DC-powered switch, if none of the first two conditions is available, ground it
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.
(2) (2)
(4) (4)
(6) (6)
(1) AC/DC power cabinet
(5) RTN
(9) Grounding screw

Figure 3-9 Grounding through the PGND of a power cabinet

(1) (1)
(3) (3)
(5) (5)
(4) (4)
(2) Grounding screw
(5) AC-input (with 3-wire cable)
(1) (1)
(11) (11)
(3) (3)
(5) (5)
(8) (8) (8)
(7) (7)
(2) -48V strip
(6) PGND strip
(10) Ethernet switch
Huawei Technologies Proprietary
(2) (2)
(6) (6)
(10) (10) (9) (9) (9)
(3) -48V
(7) Grounding
(11) DC-input
3-6
Chapter 3 Installing the Switch
(3) Power transformer
(6) Ethernet switch
(4) RTN strip
(8) Ground wire