The NEC recognizes a cable tray as being different from a cable raceway in that a raceway is fully enclosed and a tray is not. NEC Article 392 outlines the key rules for installing and maintaining industrial cable tray systems. These systems, made from metal or plastic, are open structures designed to support electrical conductors, ensuring proper organization and safety. Here's what you need to know: Cable Types: Only use. us-trations without notice. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. Designed to support and protect all types of wiring—including high-voltage power lines, control cables, telecommunication cables, and fiber optic cables —they ensure. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. Each of these is characterized by having at least one face. Article 100 of the National Electrical Code defines raceway as “an enclosed channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted in the NEC.