... ,660V 2.ABB, Schneider, GE parts optional Low Voltage distribution, switch cabinetsFixed Switchgear,Protective Control Cabinet 1.380,400, ... C2. Altitude: <=1000m3. Air humidity:daily average of Air humidity <=95%, daily average of partial vapor pressure <= 2.2kPa;monthly ... average of Air humidity <=90%, monthly average of partial vapor pressure <= 1.8kPa4. ...