Current stage: 20.99 Effective date: 3 korr 2026
Next stage: CD Next stage date: 31 mar 2027
Originator: IEC
Owner: TC 68
Type: International Standard
ICS: 17.220.20 29.030
IN_DEVELOPMENT IEC 63311 ED1 20.99 WD approved for registration as CD 3 korr 2026