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Table 3 Dust concentration limit in the equipment room
Substance
Dust particles
NOTE:
Dust diameter ≥ 5 µm
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion
and premature aging of components, as shown in
Table 4 Harmful gas limits in an equipment room
Gas
SO
2
H
S
2
NH
3
Cl
2
Cooling
•
Maintain a minimum clearance of 10 cm (3.94 in) around the air vents.
•
Make sure the installation site has a good ventilation system.
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the router and application
system, adversely affect the router in the following ways:
•
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, perform the following tasks:
•
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
•
Keep the router far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
Lightning protection
To protect the router from lightning, follow these guidelines:
•
Make sure the router is reliably grounded by using a grounding cable.
•
Make sure the AC power receptacle is reliably grounded.
•
Install a lightning protector at each power input end.
Concentration limit (particles/m
4
≤ 3 x 10
(No visible dust on the tabletop in three days)
Table
4.
Maximum concentration (mg/m
0.2
0.006
0.05
0.01
3
3
)
3
)
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