20.99 Nov 21, 2025
CD Dec 12, 2025
IEC
TC 95
International Standard
PUBLISHED
IEC 60255-21-1:1988 ED1
PUBLISHED
IEC 60255-21-2:1988 ED1
PUBLISHED
IEC 60255-21-3:1993 ED1
PROJECT
IEC 60255-21 ED1
20.99
WD approved for registration as CD
Nov 21, 2025
Measuring relays and protection equipment - Part 21: Vibration, shock, bump and seismic tests requirements
10.99 New project approved