b. unnecessary or impossible to identify the phase when, in 5.2.1 Digital preceded by digital methods and specified in 5.2.2 to distinguish between terminal and intermediate sides of each terminal. To avoid confusion, these numbers added to a dot in the middle, for example: a terminal with a 2.1 and a 2.2 mark terminal device with 1.1 and 1.2 marks, the other element; two-terminal c of each element in different consecutive numbers the difference between the odd number in this element should be less than even numbers. 5.4 specific wire line side to identify a specific terminal identification alphanumeric wire line shall comply with the provisions in Table 1. Insurance terminal insulating material modified nylon (PA66), has good electrical and mechanical properties. Screw high-strength copper alloy, made of copper conductor with pressure frame crevice corrosion of copper alloy with an anti-stress, these metal tin or nickel plated surface is also protected. All copper battery terminals to avoid the effect of steel metal parts and copper wire in a humid environment. Intermediate terminals connecting hole, can also be used to connect the central side plug-in connecting piece; 4mm2 wires may be connected to a voltage of 800V current 41A electrical products metal materials, many manufacturers are producing these efforts, conductivity and temperature directly affect contact resistance, high-temperature line motor UL classification, chemical elements and material quality of elasticity, elastic modulus, hardness, tensile strength related to the modulus of elasticity selection formula calculated by the fourth strength theory of mechanics of materials. The greater the conductivity of the material, the more lower contact resistance small temperature rise, and plug the power relations and the contact resistance to a quadratic curve, the contact resistance is divided into: compression resistance, the film resistance, volume resistance (resistance of the conductor itself) ??? 70 to 80% of the total resistance of the resistor layer is the main factor affecting the life of the connector, should be given adequate attention, with regard to the terminals to more than Gold and silver plating, motor UL high-temperature line, although the conductivity ratio of gold to silver high, high-temperature line motor UL types, but no gold good chemical stability, resistance film caused far greater than gold, so find out the relationship between the above there is the choice of materials for our guidance, is a prerequisite for product design condition. UL standard motor hot line, Xu Chong-Electronics (certified), high-temperature line motor UL by the Dongguan Shijie Xu Chong-electronic products factory provided. Dongguan Shijie Xu Chong-electronic products plant (chuangxs.1688.com) (www.chuangxs.1688.com) Dongguan, Guangdong, connectors leaders, over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. Song Chong-wook in electronic products factory leadership with the staff warmly welcome all inquiries negotiations to create electronic products factory Song Chong-wook better future.