FLAT CABLE ASSEMBLIES

70-271 conduits, fittings, or other raceways or cables enter or leave the nonmetallic wireway, or where the direction of the nonmetallic wireway is deflected greater than 30 degrees, dimensions corresponding to Section 373-6 shall apply. 362-21. Splices and Taps. Splices and taps shall be permitted within a nonmetallic wireway provided they are accessible. The conductors, including splices and taps, shall not fill the nonmetallic wireway to more than 75 percent of its area at that point. 362-22. Supports. Nonmetallic wireways shall be supported at intervals not to exceed 3 feet (914 mm), and at each end or joint, unless listed for other support intervals. In no case shall the distance between supports exceed 10 feet (3.05 m). Exception: Vertical runs of nonmetallic wireways shall be securely supported at intervals not exceeding 4 feet (1.22 m), unless listed for other support intervals, and shall have not more than one joint between supports. Adjoining nonmetallic wireway sections shall be securely fastened together to provide a rigid joint. 362-23. Expansion Joints. Expansion joints for nonmetallic wireway shall be provided for thermal expansion and contraction. Exception: Where the length change due to thermal expansion or contraction is less than 0.25 inch (6.35 mm) in a straight run, an expansion joint shall not be required. 362-24. Extension Through Walls. Unbroken lengths of nonmetallic wireway shall be permitted to pass transversely through walls if in unbroken lengths where passing through. 362-25. Dead Ends. Dead ends of nonmetallic wireways shall be closed. 362-26. Extensions from Nonmetallic Wireways. Extensions from nonmetallic wireways shall be made using any wiring method in Chapter 3. A separate equipment grounding conductor shall be installed in any of the wiring methods used for the extension. 362-27. Marking. Nonmetallic wireways shall be marked so that the manufacturer's name or trademark and interior cross-sectional area in square inches shall be visible after installation. Nonmetallic wireways that have limited-smoke-producing characteristics shall be permitted to be identified with the suffix LS.