Current stage: 20.99 Effective date: Jul 4, 2025
Next stage: CD Next stage date: Jan 8, 2026
Originator: IEC
Owner: TC 62/SC 62C
Type: International Standard
ICS: 11.040.50
IN_DEVELOPMENT IEC 63321 ED1 20.99 WD approved for registration as CD Jul 4, 2025