3com 4800G Installation Instruction

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WITCH

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The power input end of the switch is equipped with a noise filter, whose central 
ground is directly connected to the chassis, forming the chassis ground (also 
known as PGND). This chassis ground must be securely connected to the earth 
ground so that the faradism and leakage electricity can be safely discharged to the 
ground, enhancing the EMS capability of the switch. Ground your switch as 
follows:

■

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 terminal on 
the grounding strip and fasten the captive nut. Note that the fire main and 
lightning rod of a building are not suitable for grounding. The grounding cable 
of the switch should be connected to the grounding system in the equipment 
room.

Figure 42   Ground the switch through a grounding strip

■

When there is no grounding strip but earth is available near the installation 
location and allows a grounding body to be buried, hammer an angle iron/steel 
pipe longer than 0.5 m (1.64 ft) into the earth. Weld the yellow-green 
grounding cable of the switch onto the angle iron/steel pipe, and treat the joint 
for corrosion protection.

(1) AC power socket 

(2) Grounding terminal 

(3) Protection grounding cable 

(4) Grounding strip

 

(1)

(2)

(3)

(4)