The National Electrical Code (NEC) is the ultimate authority for any cable tray installation. Specifically, NEC Article 392 governs the use, installation, and construction specifications for these systems. This standard specifies the requirements for nonmetallic cable trays and associated fittings designed for use in accordance with the rules of the Canadian Electrical Code (CEC) Part 1, and the National Electrical Code® (NEC). The selection of material and finish is a function of the environment in wh tant in a wide range. Discover the resources you need to design and build specifications for wire basket tray installations across commercial, industrial, and data center applications. Access detailed models to. us-trations without notice. The flexibility and scalability of cable trays make them an ideal choice for environments where cable density and organization can. Cable tray systems provide a safe, organized, and flexible method for supporting insulated conductors and cables in commercial and industrial electrical installations.