Ruijie RG-NBS5200 Series Switches Hardware Installation and Reference Guide
Preparation before Installation
17
2.2.3 Cleanness
Dust poses a severe threat to the running of the equipment. The indoor dust falling on the equipment may be adhered
by the static electricity, causing bad contact of the metallic joint. Such electrostatic adherence may occur more easily
when the relative humidity is low, not only affecting the useful life of the equipment, but also causing communication
faults. Table 2-2 shows the requirements for the dust content and granularity in the equipment room.
Table 2-2 Requirements for the Dust Content and Granularity in the Equipment Room
Dust
Unit
Density
Diameter
≥
0.5
μ
m
Particles/m
3
≤
3.5
×
10
6
Diameter
≥
5
μ
m
Particles/m
3
≤
3
×
10
4
Apart from dust, the salt, acid and sulfide in the air in the equipment room must also meet strict requirements, as such
poisonous substances may accelerate the corrosion of the metal and the aging of some parts. The equipment room
should be protected from the intrusion of harmful gases such as sulfur dioxide, sulfured hydrogen, nitrogen dioxide, and
chlorine), whose requirements are listed in Table 2-3.
Table 2-3 Requirements for Harmful Gases in the Equipment Room
Gas
Average (mg/m3)
Maximum (mg/m3)
SO
2
0.3
1.0
H
2
S
0.1
0.5
NO
2
0.5
1.0
Cl
2
0.1
0.3
Both average and maximum value are measured for a week. The switch cannot be placed in the environment with
the maximum density for over 30 minutes every day. ..
2.2.4 Interference Resistance
The switch
is vulnerable to external interface caused by capacity coupling, inductance coupling, electromagnetic wave
radiation, common impedance (including grounding system) coupling and conducting wires (including power cords,
signal and output wires).
Therefore, the following points should be noted:
The AC power supplying system is the TN system. The single-phase three-wire socket with protecting grounding
must be used as the socket for the power s
upply to enable the device’s upper filter circuit to effective filter the
power interface.
The switch
should be far from high-power radio transmitting stations, radar stations and high-frequency and
large-current devices.
Electromagnetic shielding methods should be applied when necessary, such as using the shielded cable as the
interface cable.
Cables must be connected to interfaces inside the room to prevent damage to the device’s signal ports caused by
over-voltage and over-current generated by thunder and lightning.
2.2.5 Grounding
A good grounding system is the basis for the stable and reliable operation of the RG-NBS5200 series switches. It is the
chief condition to prevent lightning stroke and resist interference. Please carefully check the grounding conditions on
the installation site according to the grounding requirements, and perform grounding operations properly as required.
