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

(c) Direct Buried. Direct buried cable shall comply with Section 300-5 or 710-4, as appropriate. (d) Installed as Service-Entrance Cable. Type MC cable installed as service-entrance cable shall comply with Article 230. 70-228 NATIONAL ELECTRICAL CODE (e) Installed Outside of Buildings or as Aerial Cable. Type MC cable installed outside of buildings or as aerial cable shall comply with Article 225 and Article 321. (f) Through or Parallel to Joists, Studs, and Rafters. Type MC cable shall comply with Section 300-4 where installed through or parallel to joists, studs, rafters, or similar wood or metal members. (g) In Accessible Attics. The installation of Type MC cable in accessible attics or roof spaces shall also comply with Section 333-12. 334-11. Bending Radius. All bends shall be so made that the cable will not be damaged, and the radius of the curve of the inner edge of any bend shall not be less than shown below. (a) Smooth Sheath. (1) Ten times the external diameter of the metallic sheath for cable not more than 3/4 inch (19 mm) in external diameter; (2) Twelve times the external diameter of the metallic sheath for cable more than 3/4 inch (19 mm) but not more than 1½ inches (38 mm) in external diameter; and (3) Fifteen times the external diameter of the metallic sheath for cable more than 1½ inches (38 mm) in external diameter. (b) Interlocked-type Armor or Corrugated Sheath. Seven times the external diameter of the metallic sheath. (c) Shielded Conductors. Twelve times the overall diameter of one of the individual conductors or seven times the overall diameter of the multiconductor cable, whichever is greater. 334-12. Fittings. Fittings used for connecting Type MC cable to boxes, cabinets, or other equipment shall be identified for such use. Where singleconductor cables enter ferrous metal boxes or cabinets, the installation shall comply with Section 300-20 to prevent inductive heating. 334-13. Ampacity. The ampacity of Type MC cable shall be in accordance with Section 310-15. Exception No. 1: The ampacities for Type MC cable installed in cable tray shall be determined in accordance with Sections 318-11 and 318-13. Exception No. 2: The ampacities of No. 18 and No. 16 conductors shall be in accordance with Table 402-5. (FPN): See Section 310-10 for temperature limitation of conductors. C. Construction Specifications 334-20. Conductors. The conductors shall be of copper, aluminum, or copper-clad aluminum, solid or stranded. The minimum conductor size shall be No. 18 copper and No. 12 aluminum or copper-clad aluminum. 334-21. Insulation. The insulated conductors shall comply with (a) or (b) below.