Installation ManualH3C S5100-SI/EI Series Ethernet Switches Chapter 2 Preparing for Installation2-2z High temperature is the most undesirable condition, because it accelerates agingof insulation materials and can thus significantly lower reliability and service life ofyour switch.For the detailed temperature/humidity requirements for the products, see section 1.5System Features of the S5100 Series.2.2.2 CleannessDust is a hazard to the operating safety of your device. The dust accumulated on thechassis can be adsorbed by static electricity and result in poor contact of metalconnectors or metal contact points. When the relative indoor humidity is low, especially,electrostatic adsorption is more likely to happen. This can not only shorten the servicelife of your device but also cause communications failures. The following table lists thedust concentration limit.Table 2-1 Dust concentration limit in the equipment roomSubstance Unit Concentration limitDust Particles/m³ ≤ 3 × 10 4 (No visible dust on thetabletop for three days)Note: The dust particle size is greater than or equal to 5 μmBesides dust, there are rigorous limits on the content of harmful substances that canaccelerate the corrosion and aging of metals, such as salts, acids, and sulfides in theair in the equipment room, and the equipment room must be protected againstingression of harmful gases such as SO2, H 2S, NH3, and Cl2. For the specificrequirement, see the following table.Table 2-2 Harmful gas limits in the equipment roomGas Maximum concentration (mg/m3)SO 2 0.2H 2S 0.006NH 3 0.05Cl2 0.012.2.3 Electromagnetic SusceptibilityThe operation of your switch can be affected by external interferences, such asconducted emission by capacitance coupling, inductance coupling, electromagneticwave radiation, and common impedance (including the grounding system) coupling,
