Distribution cables with extruded insulation for rated voltages from 3,6/6 (7,2) kV up to and including 20,8/36 (42) kV. Part 9: HEPR insulated single core cables, and single core pre-assembled cables. Section E: Cables with polyolefin compound sheath (types 9E-1, 9E-3, 9E-4 and 9E-5).