Current stage: 20.99 Effective date: Mar 8, 2024
Next stage: CD Next stage date: Oct 30, 2025
Originator: IEC
Owner: TC 22/SC 22E
Type: Technical Specification
ICS: 29.200
IN_DEVELOPMENT IEC TS 63557 ED1 20.99 WD approved for registration as CD Mar 8, 2024