Grounding leading-out device can effectively prevent groundwater seepage and meet the requirements of stray current protection when connecting power equipment grounding, signal equipment grounding, lightning protection grounding and integrated grounding network on subway platform. In the subway grounding system, due to the protection requirements of fault current (stray current), the grounding grid is located under its structural bottom plate. Therefore, when the electrical equipment on the subway platform is earthed, it must be connected to the grounding grid through the grounding lead-off line to realize reliable grounding. In the past, grounding leads are usually drawn directly from the structural bottom plate or through PVC pipe. With this measure, it is easy to fail to meet the protection requirements of the fault current (stray current), and the groundwater is easy to leak out from the grounding lead, which cannot meet the design requirements of subway grounding. Grounding lead-out device is composed of protection cylinder, water stop ring, grounding lead-out line, insulation filling material and so on. The protective tube is made of stainless steel, the grounding lead is made of T2 copper, the hollow part of the protective tube is filled with insulating material, which has the advantages of scientific material selection, reasonable structure, advanced technology, stable and reliable quality, convenient construction and installation, etc. It can effectively prevent groundwater seepage when the ground of power equipment, signal equipment and lightning protection is connected with the integrated grounding network on the subway platform, and can well meet the fault current (stray current) protection requirements. Type of grounding leadout device: Type of tube body leadout H/mm D /mm S/mm L1/mm L2/mm ZH-R 108*1300-50*(400+300) 1300 108 50*5 400 300 ZH-R 108*1500-50*5*(400+300) 1500 108 50*5 400 300 ZH-R 108*1650-50*5*(650+600) 1650 50*5 650 * 600