The Bureau of Indian Standards, on November 17, 2025, issued the date of withdrawal of certain Indian Standards.
The following is the list of Indian Standards whose date of withdrawal is November 10, 2025:
• IS 4257 (Part 2) – 1986 - Dimensions for Clamping Arrangements for Porcelain Transformer Bushings - Part 2 for 72.5 kV and 123 kV Bushings.
• IS 4318: 1993 - Solid Core Porcelain Insulators for Overhead Traction Lines — Specification (First Revision)
• IS 5350 (Part 1) – 1970 - Dimensions of Indoor and Outdoor Porcelain Post Insulators and Post
Insulator Units for Systems with Nominal Voltages Greater Than 1000 V Part I Indoor Post Insulators
Please refer to the document attached below for more details.
