The IEC 61936-1:2021 standard (Edition 3.0) updates safety and design requirements for high-voltage AC power installations exceeding 1 kV, superseding the 2010 version. This revision introduces critical technical improvements, including updated gas-insulated switchgear (GIS) requirements, enhanced environmental protections, and modified earthing safety criteria. Purchase the standard directly from the IEC Webstore . IEC 61936-1:2021
IEC 61936-1:2021 works in close conjunction with IEC 61936-2 for earthing. The standard reinforces the requirement for Earth Potential Rise (EPR) calculations. It specifies that earthing systems must limit touch and step voltages to safe levels, explicitly accounting for fault currents from modern inverter-based resources (like solar and wind farms), which can have different fault characteristics than traditional rotating machines.
: High-voltage power infrastructure deployed on marine wind farms or open-water platforms.
: Unofficial PDF links frequently host malicious scripts capable of breaching corporate engineering networks. Where to Legally Download the Standard
: Updated terms, definitions, and changed "should" to "shall" in many instances to make requirements mandatory rather than advisory. Scope and Applications
To avoid scope overlap with other specialized standards, IEC 61936-1:2021 explicitly excludes:
IEC 61936-1:2021 is the cornerstone international standard governing the design and erection of AC electrical power installations with nominal voltages exceeding 1 kV. This paper analyzes the technical framework provided by the standard, focusing on its updated safety philosophies, insulation coordination requirements, and structural design criteria. It explores how the 2021 revision modernizes guidelines for substations and switchgear to accommodate evolving grid technologies, including the integration of renewable energy sources and digital monitoring systems.
The 2021 edition provides explicit rules to prevent catastrophic electrical failures, fires, and structural collapses. 1. Insulation Co-ordination and Clearances