Cleanness; Electromagnetic Susceptibility - H3C LS-5500-28C-PWR-SI-OVS Installation Manual

Installation Manual
H3C S5500-SI Complete Series Ethernet Switches
aging of insulation materials and can thus significantly lower reliability and service life of
your switch.
For the temperature and humidity requirements of different models, refer to section 1.4
"System Specifications of the S5500-SI Series".

2.2.2 Cleanness

Dust is a hazard to the operating safety of your device. The dust accumulated on the
chassis can be adsorbed by static electricity and result in poor contact of metal
connectors or metal contact points. Especially when the indoor relative humidity is low,
electrostatic adsorption is more likely to happen. This can not only shorten the service
life of your device but also cause communications failures. The following table lists the
dust concentration limit.
Table 2-1 Dust concentration limit in the equipment room
Substance
Dust
Note: The dust particle size ≥ 5 μm.
Besides dust, there are rigorous limits on the content of harmful substances in the air
that can accelerate the corrosion and aging of metals, such as chloride, acid, and
sulfide in the equipment room, and the equipment room must be protected against
ingression of harmful gases such as SO
see the following table.
Table 2-2 Harmful gas limits in the equipment room
SO
2
H S
2
NH
3
Cl
2

2.2.3 Electromagnetic Susceptibility

The operation of your switch can be affected by external interferences, such as
conducted emission by capacitance coupling, inductance coupling, electromagnetic
wave radiation, and common impedance (including the grounding system) coupling,
and leads (power cords, signaling cables and output wires). To eliminate the
interferences, pay attention to the following:
Unit
Particles/m³
, H
2
Gas
2-2
Chapter 2 Preparing for Installation
Concentration limit
4
≤ 3 x 10
(no visible dust on the
tabletop within three days)
S, NH , and Cl . For specific requirements,
2 3 2
Maximum concentration (mg/m
0.2
0.006
0.05
0.01
3
)