Current stage: 20.99 Effective date: 5 dhj 2025
Next stage: CD Next stage date: 28 shk 2026
Originator: IEC
Owner: TC 47
Type: International Standard
ICS: 31.080.99
IN_DEVELOPMENT IEC 63551-1 ED1 20.99 WD approved for registration as CD 5 dhj 2025