Current stage: 20.99 Effective date: 18 sht 2026
Originator: IEC
Owner: TC 23/SC 23H
Type: International Standard
ICS: 29.120.30
PUBLISHED IEC 60309-4:2021 ED2
IN_DEVELOPMENT IEC 60309-4/AMD1 ED2 20.99 WD approved for registration as CD 18 sht 2026