They can be rated for outdoor, indoor, for corrosive areas, for hazardous locations, or high electrical noise areas. They are protected by either a plastic Jacket or metal armor over individual conductor insulations. In general, tray rated cables are quality products that have been tested to withstand the rigors of severe environments. To that end this Bulletin is intended to discuss the types of cables most frequently used in cable trays and the wiring methods permitted in cable trays under the National Electric Code (NEC) NFPA 70. Therefore, it is also important to understand how to properly apply and install the cables in a cable tray system. Another important component is obviously the cable. The cable tray system is only one component of the cable management system. Through NEMA and the Cable Tray Institute numerous articles, standards, and other general guidance can be found regarding the proper use and installation of cable tray systems. The purpose of a cable tray system is to support, route, and protect cable as part of the cable management system.
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