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See Chinese contents: GB/T 12706.4-2020 GB/T 12706.4-2020: Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) -- Part 4: Test requirements on accessories for cables with rated voltages from 6 kV (Um=7.2 kV) up to 35 kV (Um=40.5 kV)
