H3C S3100V2 Series Installation Manual

Also see for S3100V2 Series: Installation, quick start

Contents

10Table 3 Humidity requirementsHumidity RangeOperating humidity (noncondensing) 10% to 95%Storage humidity (noncondensing) 5% to 95%Lasting high relative humidity tends to cause poor insulation, electricity creepage, mechanical propertychange of materials, and corrosion of metal parts. Lasting low relative humidity is likely to result in loosescrews due to washer contraction, and even electrostatic discharge (ESD), which causes the circuits tofail.Cleanness requirementsDust is a hazard to the operating safety of your switch. Dust buildup on the chassis may result inelectrostatic adsorption, which causes poor contact of metal components and contact points, especiallywhen indoor relative humidity is low. In the worst case, electrostatic adsorption can causecommunication failure.Table 4 Dust concentration limit in the equipment roomSubstance Concentration limit (particles/cu m)Dust particles ≤ 3 x 104(No visible dust on desk in three days)NOTE:Dust particle diameter ≥ 5 μmIn addition, the equipment room should meet strict limits on salts, acids and sulfides to eliminatecorrosion and premature aging of components, as shown in Table 5.Table 5 Harmful gas limits in an equipment roomGas Max. (mg/m 3 )SO2 0.2H2 S 0.006NH3 0.05Cl2 0.01EMI requirementsAll electromagnetic interference (EMI) sources, from outside or inside of the switch and applicationsystem, adversely affect the switch in a conduction pattern of capacitance coupling, inductance coupling,electromagnetic wave radiation, or common impedance (including grounding system) coupling. Toprevent EMI, perform the following steps:• Take measures against interference from the power grid.• Do not use the switch together with the grounding equipment or light-prevention equipment ofpower equipment, and keep the switch far away from them.