PDF Standards IEC 60502-1 Ed. 3.0 en:2021
Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV(Um = 36 kV) – Part 1: Cables for rated voltages of 1 kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV)
standard by International Electrotechnical Commission, 02/09/2021