In addition to cables, the PV1-F solar cable products for photovoltaic power generation equipment also include special products such as photovoltaic conductive tape, photovoltaic junction box and photovoltaic connector. PV cable manufacturers generally have these supporting products. Before PV1-F solar cables and these related supporting products are allowed to enter the photovoltaic power generation system, they must first pass the corresponding German TUV certification, which is commonly known as the "Rhine certification", otherwise they cannot enter the market. As the German TUV certification organization that controls the threshold for PV cables to enter the network, the "TUV Rheinland China Group" was established in Shanghai to engage in TUV certification of cable products in Greater China. The organization enthusiastically serves TUV cable product certification units. It is very professional and meticulous from data declaration, product inspection and factory site audits, and has made a great contribution to the quality control of PV cables. However, due to the sluggish PV cable market, the certification business has decreased significantly.