FAQs
IEC 60050-436:1990 [Current]
IEC 60050-521:1984 [Revised]
IEC 60050-521:2002 [Current]
IEC 60050-521:2002/AMD1:2017 [Current]
IEC 60050-521:2002/AMD2:2018 [Current]
IEC 60050-531:1974 [Current]
IEC 60050-531:1974/AMD1:2017 [Current]
IEC 60050-531:1974/AMD2:2020 [Current]
IEC 60050-541:1990 [Current]
IEC 60050-541:1990/AMD1:2015 [Current]