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. Here's what you need to know: Cable Types: Only use. For example, NEC Section 392. 3(D) states that cable trays in hazardous locations should contain only the wiring permitted in specific sections of Chapter 500 (Sections 501. Since cable trays come in a wide variety of sizes, they can be designed to accommodate. NEC Article 392 explains cable trays, their components, appropriate wiring methods for cable trays, and instances where they are and are not permitted for use.
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