: Mandates that outdoor transformer installations (with >1,000 liters of liquid) must be laid out to prevent fire hazards to surrounding objects. For indoor units in industrial buildings, fast-acting protective devices are required .
| Parameter | Requirement for "Hot" (Energized) Installations | | :--- | :--- | | | Phase-to-earth: Minimum 120 mm for 12 kV; increases to 1600 mm for 245 kV | | Live Working Min Distance | Must be calculated per IEC 61472, but generally 0.3m (12 kV) to 3.5m (420 kV) | | Enclosure Type | If "hot" parts are accessible, IP2X or IPXXB minimum (finger-proof) | | Warning Signs | Mandatory at every entrance to a "hot" compartment | | Earthing | All metallic enclosures surrounding a hot conductor must be solidly earthed (< 1 Ohm) | | Arc Flash | If live working (hot) is planned, the prospective arc energy must be calculated (new in 2021 ed.) | iec 61936 pdf hot
IEC 61936-1 is the international benchmark for power installations exceeding 1 kV AC (typically up to 245 kV, but principles apply higher). It replaces older national standards (e.g., VDE 0101, BS 7354). It replaces older national standards (e
The hot version refers to a possibly newer edition. Please make sure to verify which version applies. : Designing the power intake for large-scale factories,
: Designing the power intake for large-scale factories, mines, and refineries.
This content is designed for an engineer, student, or technician who needs to understand the standard without buying the official 200+ page document first.