Current stage: 20.99 Effective date: 31 tet 2025
Next stage: CD Next stage date: 31 dhj 2026
Originator: IEC
Owner: TC 125
Type: International Standard
ICS: 43.120 33.100.10
IN_DEVELOPMENT IEC 63281-4-1 ED1 20.99 WD approved for registration as CD 31 tet 2025