... 50mm2 to 83mm2, suitable for rated voltages of 66kV, 115kV, 150kV, 250kV and 275kV.*The effective sectional area of the double ... ranges from 90mm2 to 200mm2, suitable for rated voltages of 150kV, 250kV, 275kV, 380kV and 500kV.*The effective sectional area of ...