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See Chinese contents: GB/T 31489.4-2020 GB/T 31489.4-2020: D. C. extruded cables systems for power transmission at a rated voltage up to and including 500 kV--Part 4: Accessories for D. C. cables
This Part of GB/T 31489 specifies the service characteristics, product naming, technical requirements, accessories marking, accessories test, acceptance inspection rules, packaging, transportation and storage of XLPE insulated power cable accessories for power transmission at a rated voltage up to and including 500 kV. This Part is applicable to the terminations and joints of XLPE insulated DC land cables and DC submarine cables for power transmission at a rated voltage up to and including 500 kV.
