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Figure 12 Mounting the switch on a workbench
Grounding the switch
Correctly connecting the switch grounding cable is crucial to lightning protection and EMI protection.
The power input end of the switch has a noise filter, whose central ground is directly connected to the
chassis to form the chassis ground (commonly known as PGND). You must securely connect this chassis
ground to the earth to minimize the potential for system damage, maximize the safety at the site, and
minimize EMI susceptibility of the system.
You can ground the switch in one of the following ways, depending on the grounding conditions
available at the installation site:
Grounding the switch with a grounding strip
Grounding the switch with a grounding conductor buried in the earth ground
Grounding the switch by using the PE wire of the AC power cord
The power and grounding terminals in this section are for illustration only.
Grounding the switch with a grounding strip
Connect the grounding cable to the grounding system in the equipment room. Do not connect it to a fire
main or lightning rod.
If a grounding strip is available at the installation site, use the grounding strip to ground the switch.
To ground the switch by using a grounding strip:
1. Connect one end of the grounding cable to the grounding screw on the switch.
a. Remove the grounding screw from the rear panel of the switch chassis.
b. Attach the grounding screw to the ring terminal of the grounding cable.
c. Use a screwdriver to fasten the grounding screw into the grounding screw hole.
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