GOST 14255-1969 Electrical apparatus for voltage to 1000 V. Shells. Degrees of protection
GOST 15150-1969 Machines, instruments and other industrial products. Modifications for different climatic regions. Categories, operating, storage and transportation conditions as to environment climatic aspects influence
GOST 15543-1970 Electrical articles. Applications for different climatic regions. General technical requirements as to environment climatic aspects influence