Legal analysis: in accordance with national standards, grounding wire cross-section of not less than 40 × 4 galvanized flat iron; transformer's working grounding resistance value is not greater than 1 ohm. The grounding of the overhead line is mainly lightning protection, and there is a difference between the station and the line. The station grounding and transformer consistent; line grounding resistance value is not greater than 10 ohms.
Legal basis: "Chinese People's **** and National Product Quality Law"
Article 3 The producers and sellers shall establish and improve the internal product quality management system, the strict implementation of the post quality norms, quality responsibility, as well as the corresponding assessment methods.
Article 6 The state encourages the implementation of scientific quality management methods, the use of advanced science and technology, and encourages enterprise product quality to meet and exceed industry standards, national standards and international standards. Advanced product quality management and product quality to reach the international advanced level, significant achievements of units and individuals, be rewarded.