How many cables are used for visual grounding of Hefei Metro Line 4?

35kV power cable. According to the information of official website of Hefei Municipal Transportation Bureau, the visual grounding transformation of Hefei Rail Transit Lines 4 and 5 and their extension lines adopts 35kV power cable dedicated for engineering power supply system. Hefei Metro Line 4 is the fourth line of Hefei Metro, with a total investment of about 27.675 billion yuan and a total length of 4 1.37km, all of which are underground lines with orange signs.