Following IEC 61936-1:2021 is not just a best practice—it is often a legal requirement in many jurisdictions. In Australia, for example, the draft is based on this 2021 international standard.
| | Detail | | ---------------------------------- | ------------------------------------------------------------------------- | | Full designation | IEC 61936‑1:2021 | | Title | Power installations exceeding 1 kV AC and 1,5 kV DC – Part 1: AC | | Edition | 3.0 (2021) | | Pages | 245 | | Price | CHF 430 (approximately USD 480) | | Technical Committee | TC 99 (Insulation co‑ordination and system engineering of HV installations) | | Stability date | 2028 | | European version | EN IEC 61936‑1:2021 + A11:2025 | | Key amendments | A11:2025 (CENELEC) effective February 2026 | | Supersedes | IEC 61936‑1:2010 (including Amendment 1:2014) |
The standard refines the calculation of minimum air clearances. It emphasizes the relationship between the and the Rated Power Frequency Withstand Voltage . The 2021 edition provides updated tables for phase-to-earth, phase-to-phase, and phase-to-structure clearances, ensuring designs can withstand transient overvoltages more effectively. iec 6193612021 link
For CENELEC countries, the amendment A11:2025 adds specific obligations regarding earthing (EN 50522) and national provisions (Annexes ZA and ZB). Designers must check whether their country has listed special conditions in Annex ZA.
Since there is no academic "paper" written by a single author regarding this specific standard (as it is a technical standard published by the International Electrotechnical Commission), I have developed a comprehensive technical overview paper below. Following IEC 61936-1:2021 is not just a best
: The section on protection, automation, and auxiliary systems was completely restructured for better clarity.
Many technical sites offer glimpses of the figures, such as this UNE-EN IEC 61936-1:2021 sample . Conclusion It emphasizes the relationship between the and the
Mitigating hazards from hazardous materials (e.g., oil-filled equipment). Key Changes and Features in the 2021 Revision
To obtain the full official text, you must purchase it from the IEC Webstore or an authorized reseller:
Designing a substation or power plant under IEC 61936-1:2021 requires strict adherence to physical and electrical parameters. 1. Insulation and Clearances