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H3C S3100-SI Series Ethernet Switches
Chapter 2 Installation
Preparation
2-4
Table 2-2 Limits on harmful gas in the equipment room
Gas Max content (mg/m³)
SO
2
0.2
H
2
S
0.006
NH
3
0.05
Cl
2
0.01
2.2.3 Anti-interference Requirements
A switch in use may be affected by the interference from outside
the system by way of capacitance coupling, inductance coupling,
electromagnetic radiation, public impedance (including the grounding
system) coupling or conducting line (power line, signaling line and
transmission line etc.). Therefore, you should pay attention to the
following:
z If AC supply system is TN system, AC power socket should
be a single-phase three-line power socket with Protection
Earth (PE) so that the filter circuit on the equipment can
effectively filter out the interference coming from the power
supply system.
z Keep the switch far away from high-power radio transmitters,
radars, and high-frequency heavy-current devices.
z Adopt electromagnetic shielding measure if necessary. For
example, you can adopt shielded interface cable.
z Wire interface cables indoors. Do not wire cables outdoors
in case that overvoltage and overcurrent damage the
device.