Ruijie RG-PF2920 Series Hardware Installation And Reference Manual page 18

Hardware Installation and Reference Guide
2.2.4 Anti-interference
The switch is susceptible to external interference by capacitive coupling, inductive coupling, electromagnetic
waves, common impedance (ground) coupling, or conduction over power lines, signal lines, and output lines.
Pay attention to the following points:

The switch should be located far away from the high-power radio launch pads, radar launch pads, and high-
frequency large-current devices.

Use electromagnetic interference (EMI) shielding such as shielded interface cables to minimize interference
when necessary.

Route interface cables only indoors to prevent signal ports from being damaged by overvoltage or overcurrent
caused by lightning strikes.
2.2.5 Grounding
A proper grounding system is the basis for stable and reliable device running. It is indispensable for preventing
lightning strikes and interference. Carefully check grounding conditions of the installation site against grounding
specifications, and ground the device properly based on the actual situation.
Warning
Ensuring proper grounding of the switch is crucial to effectively protect against lightning and prevent
interference. Therefore, it is imperative for users to correctly ground the switches.

Safety 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.
Caution

The building should provide a protective ground connection to ensure that the device is connected to a
protective earth.

The O&M personnel should check whether the DC socket is reliably connected to the protective ground
of the building. If not, the O&M personnel should use a protective earth conductor from the DC outlet
protective earth terminal to the building protective earth.

The power socket should be installed near the device and easily accessible.

The power cord should be connected to an output socket which connects to the ground.

During device installation, ensure that the grounding connection is the first to be established and the last
to be disconnected.

The cross-sectional area of the protective ground cable should be at least 0.75 mm

Install the switch by using 3-core power cords, with a minimum cross-sectional area of 0.75 mm
18AWG per pin.

Lightning Grounding
The lightning protection system of facilities is standalone, and is composed of a lightning rod, a down
conductor, and a connector connected to the grounding system. The grounding system is usually used for
power reference grounding and safe grounding of the rack. Lightning grounding is required only for facilities
and is not required for the switch.
16
Preparing for Installation
2
(18 AWG).
2
or