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2-15

Grounding the switch

WARNING

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

NOTE:

The

chassis views and power supply and grounding terminal positions in the following figures

are for

illustration only.

Grounding the switch with a grounding strip

WARNING

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. Attach the ring terminal end of the grounding cable to the grounding hole in the switch.

a. Remove the grounding screw from the grounding hole in the rear panel of the switch.

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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