Current stage: 20.99 Effective date: 5 qer 2026
Next stage: CD Next stage date: 28 gush 2026
Originator: IEC
Owner: TC 47/SC 47A
Type: International Standard
ICS: 31.200
IN_DEVELOPMENT IEC 63664 ED1 20.99 WD approved for registration as CD 5 qer 2026