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In addition, salt, acid and sulfide in the air are also harmful to the switch. Such
harmful gases will aggravate metal corrosion and the aging of some parts. The site should
avoid harmful gases, such as SO
threshold value.
Gas
SO
2
H
S
2
NO
2
NH
3
Cl
2
2.1.1.2 Temperature and Humidity
Although the switch is designed to use 4 fans, the site should still maintain a desirable
temperature and humidity. High-humidity conditions can cause electrical resistance
degradation or even electric leakage, degradation of mechanical properties and corrosion
of internal components. Extreme low relative humidity may cause the insulation spacer to
contract, making the fastening screw insecure. Furthermore, in dry environments, static
electricity is liable to be produced and cause harm to internal circuits. Temperature
extremes can cause reduced reliability and premature aging of insulation materials, thus
reducing the switch's working lifespan. In the hot summer, it is recommended to use
air-conditioners to cool down the site. And the cold winter, it is recommenced to use
heaters.
The recommended temperature and humidity are shown below:
Temperature:
Long term condition
15 ~ 30°C
Table 2-3 Environmental Requirements: Temperature and Humidity
Caution!
A sample of ambient temperature and humidity should be taken at 1.5m above the
floor and 0.4m in front of the switch rack, with no protective panel covering the front and
rear of the rack. Short term working conditions refer to a maximum of 48 hours of
, H
S, NO
2
2
Average (mg/m³)
0.2
0.006
0.04
0.05
0.01
Table 2-2 Environmental Requirements: Particles
Short term condition
0 ~ 50°C
2-2
, NH
and Cl
, etc. The table below details the
2
3
2
Max (mg/m³)
1.5
0.03
0.15
0.15
0.3
Relative humidity
Long term condition
40 ~ 65%
Hardware Installation
Short
term
condition
10 ~ 95%
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