Due to their exposure to the open air because of the cable trays, the wires contained within need a very durable outer covering. The regulations dictate that the cables must either be Type TC (also known as Tray Rated) or must be metal-armored (Type MC). Grounding: Metallic trays can serve as equipment grounding conductors (EGC) if they meet NEC requirements. This is a description of how to select, install, and support these metal or plastic frames, on which electrical wires are installed. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. According to NEC Article 392. 10 (B) (1), the smallest size single conductor allowed to be installed in a cable tray is 1/0 AWG. For the installation of single conductor cables sized 1/0 AWG to 4/0 AWG in industrial establishments, the NEC specifies the maximum allowable rung spacing for the cable. 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. The information has been organized for.
