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IEC 61936-1:2021 is an essential, updated standard for anyone involved in the design or construction of HV systems. By aligning with these 2021 requirements, organizations can ensure their installations are safe, efficient, and up-to-date with global safety standards.

The first edition of IEC 61936‑1 was published in . A second edition followed in 2010 , with an amendment in 2014 . The third edition (2021) therefore represents more than a decade of accumulated experience and technical progress.

Clarified application to include systems with nominal frequencies up to

includes rotating electrical machines, switchgear, transformers and reactors, converters, cables, wiring systems, batteries, capacitors, earthing systems, buildings and fences (that are part of a closed electrical operating area), associated protection, control and auxiliary systems, and large air core reactors. iec 6193612021 link

Properly applied, the standard significantly reduces the risk of arc flash incidents and fatal electrocution.

The 2021 date only applies to Amendment 1 . The core document remains the 2017 edition. You must buy the “Consolidated version” (CSV) which includes the amendment.

In January 2026, a was published and became effective on 1 February 2026 for most CENELEC member countries, with a latest date of withdrawal (dow) for conflicting national standards set for 3 February 2026 . IEC 61936-1:2021 is an essential, updated standard for

Note: It does not apply to the design of manufactured switchgear (covered by IEC 62271) or overhead lines/underground cables themselves. How to Implementation the Standard

Specific updates to minimum height clearances and safety distances within closed electrical operating areas, including better definitions for snow effects.

Enhanced alignment with EN 50522 for earthing of power installations. A second edition followed in 2010 , with

Standardizing clearances and insulation levels. Key Changes in the 2021 Edition

The standard does apply to the design and erection of:

Transformer fire separation walls must be 120 minutes fire-rated (REI 120). Oil containment pits require a capacity of at least 100% of the transformer oil volume.

Including those for electricity suppliers and industrial consumers.

Many technical sites offer glimpses of the figures, such as this UNE-EN IEC 61936-1:2021 sample . Conclusion