20.99 Feb 20, 2026
CD Jun 30, 2026
IEC
TC 17/SC 17C
Technical Specification
PROJECT
IEC TS 62271-307 ED1
20.99
WD approved for registration as CD
Feb 20, 2026
High-voltage switchgear and controlgear - Part 307: Procedures for the extension of validity of type tests of AC metal and solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
20.99 WD approved for registration as CD