Determines the ability of electrotechnical products to withstand the stresses occurring in a climate of high relative humidity, with or without condensation, with special regard to variations of electrical and mechanical characteristics. Provides guidance for Tests Ca (AS 1099.2.3), Cb (IEC 68-2-56), Db (IEC 68-2-30) and Z/AD (AS 1099.2Z/AD). The Standard is identical with and has been reproduced from IEC 68-2-28:1990.