6
•
Lasting low relative humidity can cause washer contraction and ESD and bring problems including
loose captive screws and circuit failure.
•
High temperature can accelerate the aging of insulation materials and significantly lower the
reliability and lifespan of the switch.
Table 4
Temperature/humidity requirements
Item Range
Operating temperature
0°C to 45°C (32°F to 113°F)
Operating humidity (noncondensing)
5% to 95%
Cleanness
Dust buildup on the chassis may result in electrostatic adsorption, which causes poor contact of metal
components and contact points, especially when indoor relative humidity is low. In the worst case,
electrostatic adsorption can cause communication failure.
Table 5
Dust concentration limit in the equipment room
Substance
Concentration limit (particles/cu m)
Dust particles
≤
3 x 10
4
(No visible dust on desk in three days)
NOTE:
Dust particle diameter
≥
5 µm
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion and
premature aging of components.
Table 6
Harmful gas limits in an equipment room
Gas Max.
(mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
Grounding
Using a good grounding system to protect your switch against lightning shocks, interferences, and ESD
is essential to the operating reliability of your switch. Make sure that the resistance between the chassis
and the ground is less than 1.5 ohm. For how to ground the switch, see the chapter “Installing the switch
(page
).”
Power supply
To satisfy the power supply requirements of the WX3024E: