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

70-270 NATIONAL ELECTRICAL CODE B. Nonmetallic Wireways 362-14. Definition. Nonmetallic wireways are flame-retardant, nonmetallic troughs with removable covers for housing and protecting electric wires and cables in which conductors are laid in place after the wireway has been installed as a complete system. 362-15. Uses Permitted. The use of nonmetallic wireways shall be permitted: (1) Only for exposed work. Exception: Nonmetallic wireways shall be permitted in concealed spaces in accordance with Section 640-4, Exception, item C. (2) Where subject to corrosive vapors. (3) In wet locations where listed for the purpose. (FPN): Extreme cold may cause nonmetallic wireways to become brittle and, therefore, more susceptible to damage from physical contact. 362-16. Uses Not Permitted. Nonmetallic wireways shall not be used: (1) Where subject to physical damage. (2) In any hazardous (classified) location. Exception: As permitted in Section 504-20. (3) Where exposed to sunlight unless listed and marked as suitable for the purpose. (4) Where subject to ambient temperatures other than those for which nonmetallic wireway is listed. 362-17. Other Articles. Installations of nonmetallic wireways shall comply with the applicable provisions of Article 300. Where equipment grounding is required by Article 250, a separate equipment grounding conductor shall be installed in the nonmetallic wireway. 362-18. Size of Conductors. No conductor larger than that for which the nonmetallic wireway is designed shall be installed in any nonmetallic wireway. 362-19. Number of Conductors. The sum of cross-sectional areas of all contained conductors at any cross section of the nonmetallic wireway shall not exceed 20 percent of the interior cross-sectional area of the nonmetallic wireway. Conductors for signaling circuits or controller conductors between a motor and its starter and used only for starting duty shall not be considered as current-carrying conductors. The derating factors specified in Article 310, Note 8(a) of Notes to Ampacity Tables of 0 to 2000 Volts shall be applicable to the currentcarrying conductors at the 20 percent fill specified above. (FPN): For conductor cross-sectional area, see Tables 5, 5A, 6, and 8 and the applicable Notes to Tables at the beginning of Chapter 9. 362-20. Deflected Insulated Conductors. Where insulated conductors are deflected within a nonmetallic wireway, either at the ends or where