Suspension bridge types are present in the majority of larger suspension bridges. Although the earlier types of suspension bridges are suitable only for relatively short spans, all of the 14 longest bridges in the world are suspension bridges (see List of longest suspension bridge spans). Ignoring the possibility of pre-Columbian trans-oceanic contact, there were two independent inventions of the suspension bridge, in Eurasia (probably in China) and in Central and South America. Types of suspension bridge include the following: A pure suspension bridge is one without additional stay cables and in which the main cables are anchored in the ground. This includes most
Telecommunications cable use RHH or RHW type insulation materials as defined in NFPA 70®, "National Electrical Code®," for use in dry, damp, and wet locations. Products with dual RHH/RHW ratings can be used in all locations. The following cable location definitions are derived from the 2008 NEC. To maintain a continuing level of quality on the production of cable, suppliers typically administer a Quality Management System (QMS) consistent with the latest issue of standards documents ISO 9000 and TL 9000 or an equivalent alternate quality system satisfactory to the purchaser. Quality and reliability requirements are of two types: Product and Qualification. Testing