UL is Underwriters Laboratories (Underwriter Laboratories Inc.) shorthand. UL certification is through terminals terminals UL safety test, the portion of the terminal through the UL safety test, is America's most authoritative, but also in security testing and identification of large private institutions in the world. It is an independent, non-profit, do testing for public safety professional organizations. It uses scientific methods to study the test to determine the extent of a variety of materials, devices, products, equipment, construction of life, property and whether the harm; determining, write, issue the appropriate standards and help reduce and prevent life loss of property information, while carrying out the facts research business. English definition UL: UL Underwriter Laboratories Inc. is a shorthand. UL310 is relevant certification quick connect terminals. UL certified terminals: Underwriter Laboratories Inc Terminals UL Development History: 1890s 1894: creation of UL UL founder of Williams Merrill (William Henry Merrill) Mr. founded the "underwriting Electrical Engineering Bureau" (Underwriters Electrical Bureau) terminal line 4p, namely, "the Department of Electrical Engineering of the National Bureau of Fire" (Electrical Bureau of the National Board of Fire Underwriters) predecessor. March 24, 1894, Engineering Bureau conducted its first test, the test object is "Mr. Shields" non-combustible insulation. 1895: the results of the first year UL has only three full-time employees and an annual budget of three terminal lines in Shenzhen, $ 000, a total of 75 reports issued to clients. Rail has a universal mounting feet, can be installed in the U-rail grade NC35 NC32 G-rail terminal in Dongguan cable, with such end plates, partitions and other unified grouping accessories, can be used to achieve a unified identification system ZT mark. Universal terminal block can be used in compliance with EN50 019 EEXe field standards. Using pressure line and the unique design of self-locking threaded terminal lines, making wiring connections reliable and safe. The series terminals elegant design, can be equipped with a variety of accessories, such as shorting, marking, the guard and so on. Closed screw guide holes to ensure perfect operation of potential distribution screwdriver through the side plug-in bridge pieces fixed bridge or insert line access terminals central cavity to achieve the Shenzhen terminal wire | terminal lines | Song Chong Xu electronic products factory by Dongguan Shijie Xu Song Chong electronic products factory. Dongguan Shijie Xu Song Chong Electronic Products Factory (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 continuous improvement to create innovative ideas will lead Xu Song electronic products factory and you hand in hand into the brilliant, for a better future!