·
Maximum diameter (
μm)
0.5
1
3
5
Maximum concentration
(Particles/m
3
)
1.4 x 10
7 x 10
2.4 x 10
1.3 x 10
Besides, the contents of salts, acids and sulfides in the air are also strictly limited for the equipment room. These
substances can accelerate metal corrosion and the aging of some parts. Table 2-2 describes the limit of some hazardous
gases such as SO
2
, H
2
S, NO
2
and Cl
2
in the equipment room.
Table 2-2 Limits of Hazardous Gases
Gas
Average (mg/m
3
)
Maximum (mg/m
3
)
SO
2
0.2
1.5
H
2
S
0.006
0.03
NO
2
0.04
0.15
NH
3
0.05
0.15
Cl
2
0.01
0.3
EMI
Electro-Magnetic Interference (EMI), from either outside or inside the equipment or application system, affects the system
in the conductive ways such as capacitive coupling, inductive coupling, and electromagnetic radiation.
There are two types of electromagnetic interference: radiated interference and conducted interference, depending on the
type of the transmission path.
When the energy, often RF energy, from a component arrives at a sensitive component via the space, the energy is
known as radiated interference. The interference source can be either a part of the interfered system or a completely
electrically isolated unit. Conducted interference results from the electromagnetic wire or signal cable connection between
the source and the sensitive component, along which cable the interference conducts from one unit to another. Conducted
interference often affects the power supply of the equipment, but can be controlled by a filter. Radiated interference may
affect any signal path in the equipment and is difficult to shield.
For the AC power supply system TN, single-phase three-core power socket with protective earthing conductors (PE)
should be adopted to effectively filter out interference from the power grid through the filtering circuit.
The grounding device of the access point must not be used as the grounding device of the electrical equipment or
anti-lightning grounding device. In addition, the grounding device of the access point must be deployed far away
from the grounding device of the electrical equipment and anti-lightning grounding device.
Keep the equipment away from high-power radio transmitter, radar transmitting station, and high-frequency
large-current device.
Measures must be taken to shield static electricity.
Installation Tools
Common Tools
Electric drill, Phillips screwdriver, flathead screwdriver, related copper and fiber cables, screws,
bolts, diagonal pliers, wall anchors, straps
Special Tools
Anti-static tools
