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). Cable tray is a structure for supporting and organizing cables. Customers with experience with “raceways” tend to lean towards requiring. 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. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. Cable tray covers are protective enclosures that shield cables from environmental hazards while ensuring compliance with safety standards like NEC 392. These essential components: Example: Stainless steel covers meet NEC 392. This is a description of how to select, install, and support these metal or plastic frames, on which electrical wires are installed.