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). This is a description of how to select, install, and support these metal or plastic frames, on which electrical wires are installed. You should consider it as a series of instructions that make the buildings resistant to. What is the NEC rule regarding the continuity of cable tray systems and their accessibility? A. Here is the summary of the main points found in NEC Article. 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.
