Minimum phase-to-phase and phase-to-earth clearances change based on system voltage, altitude, and pollution level. For example, at 123 kV, standard clearance is 1.3 meters (indoor) vs 1.6 meters (outdoor).
Annex F was added as an informative guideline for safe working procedures in jurisdictions that lack local regulations. Infrastructure Improvements:
IEC 61936-1:2021 standard is the third edition of the international safety benchmark for high-voltage power installations (exceeding 1 kV AC). Released in July 2021, it provides updated requirements for the design and erection of substations, power plants, and industrial electrical systems to ensure the safety of people and the proper functioning of equipment. Key Features and Technical Changes IEC 61936-1:2021 iec 6193612021 link
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The third edition of IEC 61936‑1, which supersedes the 2010 edition (including its 2014 amendment), introduces numerous significant technical changes. These changes are thoroughly documented in the standard itself and in the , where IEC experts provide extensive commentary on the main updates. The third edition of IEC 61936‑1, which supersedes
Strengthened requirements for external fences, access doors, and warning signs for outdoor installations to prevent unauthorized entry, with specific guidance on IP1X protection levels ElecEngHub .
The most dramatic aspect of this standard is its battle against . The third edition of IEC 61936‑1
Comprehensive Guide to IEC 61936-1:2021 - Power Installations Exceeding 1 kV AC
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