H3C Technologies H3C S7500E Series Switches - Manual (Page 13)

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IMPORTANT:
When evaluating the floor loading, consider switch capacity expansion (for example, installing a new
card) in the future.
Temperature
CAUTION:
If condensation appears on the switch when you move it to a high-temperature environment, dry the switch
before powering it on to avoid short circuits.
To ensure the correct operation of the switch, ensure that the room temperature meets the requirements
described in Table 1 .
Table 1 Temperature requirements
Temperature Range
Operating temperature 0°C to 45°C (32°F to 113°F)
Storage temperature –40°C to +70°C (–40°F to +158°F)
Humidity
Maintain appropriate humidity in your equipment room, as described in Table 2 .
• Lasting high relative humidity can cause poor insulation, electricity creepage, mechanical property
change of materials, and metal corrosion.
• Lasting low relative humidity can cause washer contraction and ESD and bring problems including
loose captive screws and circuit failure.
Table 2 Humidity requirements
Humidity Range
Operating humidity (noncondensing) 5% to 95%
Storage humidity (noncondensing) 5% to 95%
Cleanliness
Mechanically active substances buildup on the chassis might result in electrostatic adsorption, which
causes poor contact of metal components and contact points. In the worst case, electrostatic adsorption
can cause communication failure.
Table 3 Mechanically active substance concentration limit in the equipment room
Substance Particle diameter Concentration limit
Dust particles ≥ 5 μm
≤ 3 x 10 4 particles/m 3
(No visible dust on desk in three days)
Dust (suspension) ≤ 75 μm ≤ 0.2 mg/m 3