It has the status of a horizontal standard in accordance with IEC Guide 108.
WITHDRAWN
IEC 60050-521:1984 ED1
PUBLISHED
IEC 60050-521:2002 ED2
60.60
Standard published
May 22, 2002
PUBLISHED
IEC 60050-521:2002/AMD1:2017 ED2
PUBLISHED
IEC 60050-521:2002/AMD2:2018 ED2