Iec 61936-1 Power Installations Exceeding 1 Kv Ac General Requirements Jun 2026

The method for calculating touch/step voltages assumes a uniform soil resistivity and a simple grid. For complex sites (multi-layer soil, rock pockets, nearby buried metal), you will need more advanced software (e.g., CDEGS) and/or the more detailed IEC 50522 (Earthing of AC substations >1 kV).