H3C Technologies H3C S5120 Series Switches - Manual (Page 38)

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Connecting the grounding cable
CAUTION:
•
Correctly connecting the switch grounding cable is crucial to the lightning protection and
electromagnetic susceptibility (EMS) of a switch.
• The power interface and grounding terminals in this section are for illustration only.
The power input end of the switch is connected with a noise filter, whose central ground is directly
connected to the chassis, forming the so-called chassis ground (commonly known as PGND). This chassis
ground must be securely connected to the earth so that the faradism and leakage electricity can be safely
released to the earth, enhancing the EMS capability of the switch.
When a grounding strip is available
When a grounding strip is available at the installation site, attach one end of the yellow-green grounding
cable of the switch to the grounding screw on the grounding strip (the grounding screw and the
grounding hole are on the rear panel of the switch and are marked with a grounding sign). To do this,
follow these steps:
Step1 Remove the grounding screw from the rear panel of the switch chassis.
Step2 Put the supplied OT terminal of the grounding cable on the grounding screw.
Step3 Fasten the grounding screw, which is attached with the OT terminal of the grounding cable, into the
grounding screw hole with a screwdriver.
Figure 37 Connect the grounding cable to the grounding hole of switch
(1) Rear panel of the switch (2) Grounding sign
(3) Grounding hole (4) OT terminal
(5) Grounding cable (6) Grounding screw
To attach the other end of the grounding cable to the grounding strip in the equipment room, follow these
steps: