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 22229-1983 Ceramic through insulators for voltage over 1000 V. General specifications
GOST 9920-1989 A.c. electrical installations for voltage from 3 to 750 kV. Creepage distance of external insulation*, 1989-12-22 Update
GOST 20454-1985 history
1985GOST 20454-1985 Ceramic through insulators of nominal voltage over 1000 V. Types, main parameters and dimensions