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Installation Manual
H3C S3100 Series Ethernet Switches
rustiness and corrosion of metal parts. If the relative humidity is too low, the captive
screws may become loose due to the shrinking of insulation washers; in addition,
electrostatic is more likely to be produced in a dry environment, which may damage the
circuit of the switch. High temperature may cause even greater damage to the switch.
High temperature for a long time will speed up the aging of insulation material, greatly
lower the reliability of the switch and greatly reduce the life span of the switch.
For the temperature and humidity requirements of different models, refer to section 1.5
"Technical Specifications".
2.2.2 Cleanness Requirements
Dust is a potential hazard to the safe operation of the switch. Falling on the equipment,
it may cause electrostatic adsorption, and hence result in poor contact of the metal
connectors or connection points. This is more likely to happen when the indoor relative
humidity is low; in this case, it may not only shorten the device's working life, but also
incur communication failure. The requirements on dust content and particle diameter in
the equipment room are shown in the following table:
Table 2-1 Requirements on dust content in the equipment room
Physical active
Dust particle
Note: Dust particle diameter ≥ 5µm
Besides the requirements on dust, rigorous requirements are also set on the content of
chloride, acid, and sulfide in the air of the equipment room. These kinds of harmful gas
will accelerate metal corrosion and aging of certain parts. The equipment room should
be protected from the intrusion of harmful gases such as SO
limits of these kinds of harmful gas are shown in the following table.
Table 2-2 Limits on harmful gas in the equipment room
SO
2
H
S
2
NH
3
Cl
2
substance
particle/m³
Gas
Chapter 2 Installation Preparation
Unit
Max content (mg/m³)
0.2
0.006
0.05
0.01
2-2
Content
4
≤ 3 × 10
(No visible dust
on desk in three days)
, H
S, NH
and Cl
2
2
3
. The
2
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