English definitions UL: UL Underwriter Laboratories Inc. is shorthand. UL310 is fast connections for terminal authentication. UL Certification Terminals: Underwriter Laboratories Inc TerminalsUL development history: 1890, 1894: creation of UL UL founder of Williams Merrill (William Henry Merrill) Mr. founded the "underwriting Electrical Engineering Bureau" (Underwriters Electrical Bureau), namely "The US National Fire Department of Electrical Engineering Bureau" (Electrical Bureau of the National Board of Fire Underwriters) predecessor. March 24, 1894, the Board conducted its first test engineering supply junction box terminals, test subjects as "Mr. Shields" non-flammable insulation material. Other manufacturing processes, the terminal of the other parts used in the manufacturing process are: instruments, casting, heat treatment and so on. The above process is not only just understand terminal blocks Which is good, is more important is to experience terminal blocks Which is affordable, sum up the terminal, step by step. So much in research and development to enhance product quality and increase project engineer project engineer responsible for the management system is the key to the completion of product development. 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. Which affordable terminal blocks, terminals, electronic products factory Song Chong-wook from Dongguan City, Shi Jie Xu Song electronic products factory provided. Dongguan Shijie Xu Chong-electronic products plant (chuangxs.1688.com) (www.chuangxs.1688.com) strong, credible, connectors, and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Xu Song Chong electronic products factory into the brilliant and you work for a better future!