Current stage: 20.99 Effective date: Jun 13, 2025
Next stage: CD Next stage date: Jun 30, 2026
Originator: IEC
Owner: TC 65/SC 65A
Type: International Standard
ICS: 25.040.01
IN_DEVELOPMENT IEC 63661 ED1 20.99 WD approved for registration as CD Jun 13, 2025