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hgis underground substation filter unit enervac

China voltage Standards,GB standards,english version ... requirements of safety and technical for underground coal mine low voltage power supply system and equipment: voltage China Safety & Security Standards: GB/T 3804-2017: High-voltage alternating current switches for rated voltage above 3.6 kV and less than 40.5 kV: voltage China National Standards: GB/T 14048.13-2017

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