Current stage: 20.99 Effective date: Dec 4, 2025
Next stage: CD Next stage date: Jan 22, 2027
Originator: IEC
Owner: TC 36/SC 36A
Type: International Standard
ICS: 29.080.20
PUBLISHED IEC 60137:2017 ED7
PUBLISHED IEC 60137:2017/COR1:2018 ED7
IN_DEVELOPMENT IEC 60137 ED8 20.99 WD approved for registration as CD Dec 4, 2025