┌──────────────────────────────────────────────────────────┐ │ IEC 61936-1:2021 Scope │ ├──────────────────────────────────────────────────────────┤ │ ✔ Substations & Power Stations │ │ ✔ Industrial & Commercial Facilities │ │ ✔ Off-shore Wind/Generation Assets │ │ ✖ Excluded: Overhead Lines Between Stations │ │ ✖ Excluded: Prefabricated, Type-Tested Substation Units │ └──────────────────────────────────────────────────────────┘
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.
❌ Using 2010 clearances for systems with arresters – 2021 reduces some gaps. ❌ Ignoring Annex B for soil resistivity modeling – leads to unsafe touch voltages. ❌ Applying AC rules to DC installations – that is IEC 61936-2. ❌ Overlooking fire separation between control buildings and HV equipment – clause 9.3 is strict.
Compliance ensures that installers and designers meet the "state-of-the-art" requirements, reducing liability in case of accidents. How to Access IEC 61936-1:2021 iec 6193612021 link
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For European users, the CENELEC amendment A11:2025 is particularly important because it aligns the standard with EU directives and adds binding national provisions. Whether you are a power system engineer, a safety manager, or a regulatory officer, IEC 61936‑1:2021 (and its European equivalent) provides the essential rules for ensuring that HV installations are safe, reliable, and compliant.
Transformers and switchgear located outside of traditional buildings. ❌ Ignoring Annex B for soil resistivity modeling
The 2021 amendment tightened the calculation of and step voltage . You must now model the fault current split between overhead earth wires, cable sheaths, and deep earth electrodes using software (e.g., CDEGS).
Refined requirements for outdoor, indoor, and open-design installations. Core Technical Requirements of IEC 61936-1:2021 1. Safety Clearances and Dimensions
: Another commercial source for the British Standard version. Key Updates in the 2021 Edition Compliance ensures that installers and designers meet the
The technical committees worked extensively to align IEC 61936-1 with European standard counterpart (earthing of power installations exceeding 1 kV AC). This reduces conflicting requirements for global engineering firms operating across regional borders. 2. Refined Clearances and Distances
: Updated minimum clearances in air based on modern practices and specific safety requirements for bare conductors in closed areas. Asset-Specific Improvements : Reintroduced missing requirements for Gas-insulated switchgear (GIS) and improved regulations for transformer installations HVAC ventilation Fire & Earthing
The standard's means that no changes or revisions are currently planned before that year, providing a stable reference for ongoing and upcoming projects.