NEC Article 336 is titled "Power and Control Tray Cable: Type TC. " It defines what tray cable is, where it can be installed, where it cannot be installed, how it must be constructed, and how its ampacity is determined. But here is where tray cable does demand a few minutes of your attention: NEC Article 336 is the code section that governs every tray cable installation in the country, and its rules directly affect what you should be quoting. Order the wrong cable type for an exposed run, and your contractor gets. We recognize the need for a complete cable tray reference source for electrical engineers and designers. The following pages address the 2014 National Electrical Code® requirements for cable tray systems as well as design solutions from practical experience. These systems, made from metal or plastic, are open structures designed to support electrical conductors, ensuring proper organization and safety. Whether you're an engineer, contractor, facilities manager or simply curious, this ultimate guide provides an in-depth understanding of tray cables, covering their types, standards.
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