Enhanced requirements for insulating liquid, grounding systems, and clearances. Scope of IEC 61936-1:2021 The standard applies to: Indoor/Outdoor Substations: High voltage / Low voltage ( ) substations IEC Webstore.
Understanding what the standard covers—and what it explicitly does cover—is critical for correct application.
The new version places a heavier emphasis on a "risk-based approach." Instead of just following rigid tables, engineers are encouraged to evaluate specific site conditions to determine safety distances and protective measures. 2. Updated Clearances iec 6193612021 link
Ensure the earthing system meets the updated safety criteria for touch and step voltages.
The core international framework governing the design, layout, and deployment of high-voltage systems is defined by the IEC 61936-1:2021 standard . Titled this document provides essential engineering rules to ensure personnel safety, livestock protection, and operational reliability for power grids worldwide. The new version places a heavier emphasis on
| | Year | Key Focus | | ----------- | -------- | ------------------------------------------------------------------------------------------------------------- | | 1st | 2001 | Initial comprehensive rules for HV AC installations. | | 2nd + A1 | 2010/2014 | Refined requirements, alignment with then‑current insulation coordination and equipment standards. | | 3rd | 2021 | Major update: clarified scope, updated EMC requirements, reintroduced GIS requirements, extended lightning protection, improved safe‑working guidance, and alignment with the latest insulation coordination standards. |
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Note: It does not apply to the design and erection of overhead lines, underground cables between separate installations, or electric traction systems. Key Updates in the 2021 Edition
