Resolución 2535: adopta el Código Eléctrico Nacional, versión 1993. (Sustituye el Anejo A del Reglamento 4435)

(3) For direct burial where listed and marked for the purpose. (b) Not Permitted. Liquidtight flexible metal conduit shall not be used: (1) Where subject to physical damage. (2) Where any combination of ambient and conductor temperature will produce an operating temperature in excess of that for which the material is approved. 351-5. Size. (a) Minimum. Liquidtight flexible metal conduit smaller than ¹/₂-inch electrical trade size shall not be used. Exception: ³/₈-inch size shall be permitted as covered in Section 350-3. (b) Maximum. The maximum size of liquidtight flexible metal conduit shall be the 4-inch trade size. 351-6. Number of Conductors. (a) Single Conduit. The number of conductors permitted in a single conduit, 1/2- through 4-inch trade sizes, shall not exceed the percentage of fill specified in Table 1, Chapter 9. (b) 3/8-Inch Liquidtight Flexible Metal Conduit. The number of conductors permitted in ³/₈-inch liquidtight flexible metal conduit shall not exceed that permitted in Table 350-3. 351-7. Fittings. Liquidtight flexible metal conduit shall be used only with approved terminal fittings. Angle connectors shall not be used for concealed raceway installations. 351-8. Supports. Where liquidtight flexible metal conduit is installed as a fixed raceway, it shall be secured at intervals not exceeding 4½ feet (1.37 m) and within 12 inches (305 mm) on each side of every outlet box, junction box, cabinet, or fitting. Exception No. 1: Where liquidtight flexible metal conduit is fished. Exception No. 2: Lengths not exceeding 3 feet (914 mm) at terminals where flexibility is necessary. 70-258 NATIONAL ELECTRICAL CODE Exception No. 3: Lengths not exceeding 6 feet (1.83 m) from a fixture terminal connection for tap conductors to lighting fixtures as required in