Hardware Installation and Reference Guide Preparing for Installation
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2.2.5 Grounding Requirements
A proper grounding system is the basis for stable and reliable running and is indispensable for preventing lightning strikes and
interference. Carefully check the grounding conditions at the installation site according to the grounding specifications, and complete
grounding properly based on the actual situation.
Safe Grounding
Ensure that the rack and power distribution device are securely grounded when the switch uses the AC power supply. Otherwise,
electric shock may occur when the insulation resistance between the power supply inside the switch and the chassis becomes small.
Lightning Grounding
The lightning protection system of facilities is standalone, and is composed of a lightning rod, a lower conductor, and a connector
connected to the grounding system. The grounding system is usually used for power reference grounding and safety grounding of the
rack. Lightning grounding is required only for facilities and is not required for the switch.
EMC Grounding
Grounding required for electromagnetic compatibility includes shielded grounding, filter grounding, noise and interference suppression,
and level reference, which contribute to the overall grounding requirements. The grounding resistance should be smaller than 1 ohm.
The back panel has one Grounding Stud.
Figure 2-1 Grounding
2.2.6 Lightning Protection Requirements
The external lightning protection cable row shall be used on the AC power port to prevent the switch from being struck by lightning
when the AC power cord is introduced from the outdoor and directly connected to the power port of the switch. The port surge arrestor
can be fixed with cable ties and screws on the rack, work bench or the wall on the equipment room. When a surge arrestor is being
used, alternating current flows through the surge arrestor before entering the switch.
Surge arrestors are customer supplied.
For details of surge arrestors, see the related user guide.
2.2.7 EMI Requirements
All interference sources, either from outside or inside of the device or application system, affect the device by capacitive coupling,
inductive coupling, or electromagnetic waves.
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