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). The use and installation of cable trays is covered by legally enforceable OSHA regulations in 29 CFR 1910. In addition, this document contains several references to provisions of the National Electric Code. In this detailed guide, we'll explore the essential inspection methods for cable trays, focusing on maintaining their structural integrity, load-bearing capacity, fire resistance, and more. The process described here takes a systematic approach to ensuring that cable tray installations meet safety, reliability, and project-specific needs while following to. Type NM cable is not permitted to be used in a residential outbuilding where subject to corrosives. Nonmetallic sheathed cables (NM, NMC, NMS) can be used in many locations. Wiring methods, components, and equipment for general use. Where cables pass through shafts, walls, slabs, or enter electrical panels or cabinets, openings shall be tightly sealed with firestopping materials in accordance with.
