In pursuance of Subrule (1) of Rule (15) of the Bureau of Indian Standards Rules, 2018, the Bureau of Indian Standards hereby

**Executive Summary** This notification issued by the Bureau of Indian Standards (BIS) announces the formal cancellation and withdrawal of five specific Indian Standards related to electrical insulators, fittings, and measuring instruments. Pursuant to the BIS Rules 2018, these standards are officially decommissioned effective from 10 June 2026. The document serves as a formal notice to stakeholders regarding the removal of these technical specifications from the active regulatory framework. **Key Points / Main Content** **Regulatory Authority and Dates** * The notification is issued under the authority of Sub-rule (1) of Rule (15) of the Bureau of Indian Standards Rules, 2018. * The official notification date is 11 June 2026, while the effective date for the withdrawal of all listed standards is 10 June 2026. **Withdrawn Standards for Insulator Fittings and Testing** * **IS 2486 (Part III) – 1974:** Specification for locking devices for insulator fittings used in overhead power lines with nominal voltage exceeding 1,000 Volts. * **IS 2486 (Part IV) – 1981:** Specific testing requirements for the locking devices mentioned in Part III for overhead power line insulator fittings. * **IS 8269 : 1976:** Methods established for conducting switching impulse tests on high voltage insulators. **Withdrawn Standards for Materials and Instrumentation** * **IS 8765 – 1978:** Specifications governing ceramic insulating materials intended for electrical purposes. * **IS 14571 : 1998 (IEC 1028: 1991):** Standards related to X-Y Recorders used as electrical measuring instruments. **Impact Analysis** **Manufacturers of Electrical Insulators and Fittings** **Impact** These manufacturers can no longer claim compliance with IS 2486 (Parts III and IV), IS 8269, or IS 8765 as active Indian Standards for their products or testing methodologies. **Action Required** Manufacturers must immediately cease referencing these withdrawn standards in technical documentation and transition to any updated or successor standards mandated by the BIS. **Manufacturers of Electrical Measuring Instruments** **Impact** The specific standard for X-Y Recorders (IS 14571 : 1998) is no longer valid within the Indian Standard framework. **Action Required** Companies producing X-Y recorders must identify and adopt the current relevant standards or international equivalents that have superseded the withdrawn specification. **Testing Laboratories and Certification Bodies** **Impact** Accreditation and testing protocols based on the withdrawn methods, particularly for switching impulse tests and locking device specifications, are now obsolete. **Action Required** Laboratories must update their scope of accreditation and internal SOPs to reflect the withdrawal of these standards effective 10 June 2026. **Power Utilities and Infrastructure Agencies** **Impact** Procurement specifications for overhead power line insulator fittings and ceramic materials that cite these standards are now outdated. **Action Required** Utilities must update their tender documents and technical requirements to ensure they do not reference the cancelled standards for future projects.

Key Entities Referenced