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

225-11. Circuit Exits and Entrances. Where outside branch and feeder circuits leave or enter a building, the requirements of Sections 230-52 and 230-54 shall apply. 225-12. Open-Conductor Supports. Open conductors shall be supported on glass or porcelain knobs, racks, brackets, or strain insulators. 225-13. Festoon Supports. In spans exceeding 40 feet (12.2 m), the conductors shall be supported by a messenger wire; and the messenger wire shall be supported by strain insulators. Conductors or messenger wires shall not be attached to any fire escape, downspout, or plumbing equipment. 225-14. Open-Conductor Spacings. (a) 600 Volts, Nominal, or Less. Conductors of 600 volts, nominal, or less, shall comply with the spacings provided in Table 230-51(c). (b) Over 600 Volts, Nominal. Conductors of over 600 volts, nominal, shall comply with the spacings provided in Part D of Article 710. 70-68 NATIONAL ELECTRICAL CODE (c) Separation from Other Circuits. Open conductors shall be separated from open conductors of other circuits or systems by not less than 4 inches (102 mm). (d) Conductors on Poles. Conductors on poles shall have a separation of not less than 1 foot (305 mm) where not placed on racks or brackets. Conductors supported on poles shall provide a horizontal climbing space not less than the following: Power conductors, below communication conductors 30 inches (762 mm) Power conductors alone or above communication conductors: 300 volts or less 24 inches (610 mm) Over 300 volts 30 inches (762 mm) Communication conductors below power same as power conductors conductors Communication conductors alone no requirement 225-15. Supports Over Buildings. Supports over a building shall be in accordance with Section 230-29. 225-16. Point of Attachment to Buildings. The point of attachment to a building shall be in accordance with Section 230-26. 225-17. Means of Attachment to Buildings. The means of attachment to a building shall be in accordance with Section 230-27. 225-18. Clearance from Ground. Overhead spans of open conductors and open multiconductor cables of not over 600 volts, nominal, shall conform to the following: 10 feet (3.05 m) - above finished grade, sidewalks, or from any platform or projection from which they might be reached where the supply conductors are limited to 150 volts to ground and accessible to pedestrians only. 12 feet (3.66 m) - over residential property and driveways, and those commercial areas not subject to truck traffic where the voltage is limited to 300 volts to ground. 15 feet (4.57 m) - for those areas listed in the 12-foot (3.66-m) classification where the voltage exceeds 300 volts to ground. 18 feet (5.49 m) - over public streets, alleys, roads, parking areas subject to truck traffic, driveways on other than residential property, and other land traversed by vehicles such as cultivated, grazing, forest, and orchard. (FPN): Note: For clearances of conductors of over 600 volts, see National Electrical Safety Code, ANSI C2-1990. 225-19. Clearances from Buildings for Conductors of Not Over 600 Volts, Nominal. (a) Above Roofs. Overhead spans of open conductors and open multiconductor cables shall have a vertical clearance of not less than 8 feet ARTICLE 225 - OUTSIDE BRANCH CIRCUITS AND FEEDERS 70-69 (2.44 m) above the roof surface. The vertical clearance above the roof level 1 shall be maintained for a distance not less than 3 feet (914 mm) in all directions from the edge of the roof. Exception No. 1: The area above a roof surface subject to pedestrian or vehicular traffic shall have a vertical clearance from the roof surface in accordance with the clearance requirements of Section 225-18. Exception No. 2: Where the voltage between conductors does not exceed 300 and the roof has a slope of not less than 4 inches (102 mm) in 12 inches (305 mm), a reduction in clearance to 3 feet (914 mm) shall be permitted. Exception No. 3: Where the voltage between conductors does not exceed 300, a reduction in clearance above only the overhanging portion of the roof to not less than 18 inches (457 mm) shall be permitted if (1) not more than 4 feet (1.22 m) of the conductors pass above the roof overhang, and (2) they are terminated at a through-the-roof raceway or approved support. Exception No. 4: The requirement for maintaining the vertical clearance 3 feet (914 mm) from the edge of the roof shall not apply to the final conductor span where the conductors are attached to the side of a building. (b) From Nonbuilding or Nonbridge Structures. From signs, chimneys, radio and television antennas, tanks, other nonbuilding or nonbridge structures, clearances, vertical, diagonal and horizontal, shall not be less than 3 feet (914 mm). (c) Horizontal Clearances. Clearances shall not be less than 3 feet (914 mm). (d) Final Spans. Final spans of feeders or branch circuits to a building they supply or from which they are fed shall be permitted to be attached to the building, but they shall be kept 3 feet (914 mm) from windows, doors, porches, fire escapes, or similar locations. Exception: Conductors run above the top level of a window shall be permitted to be less than the 3 feet (914 mm) requirement above. Overhead branch-circuit and feeder conductors shall not be installed beneath openings through which materials may be moved, such as openings in farm and commercial buildings, and shall not be installed where they will obstruct entrance to these building openings. (e) Zone for Fire Ladders. Where buildings exceed three stories or 50 feet (15.2 m) in height, overhead lines shall be arranged, where practicable, so that a clear space (or zone) at least 6 feet (1.83 m) wide will be left either adjacent to the buildings or beginning not over 8 feet (2.44 m) from them to facilitate the raising of ladders when necessary for fire fighting. (FPN): Note: For clearance of conductors over 600 volts, see National Electrical Safety Code, ANSI C2-1990. 225-20. Mechanical Protection of Conductors. Mechanical protection of conductors on buildings, structures, or poles shall be as provided for services in Section 230-50. 70-70 NATIONAL ELECTRICAL CODE 225-21. Multiconductor Cables on Exterior Surfaces of Buildings. Supports for multiconductor cables on exterior surfaces of buildings shall be as provided in Section 230-51. 225-22. Raceways on Exterior Surfaces of Buildings. Raceways on exterior surfaces of buildings shall be raintight and arranged to drain. Exception: As permitted in Section 350-2. 225-23. Underground Circuits. Underground circuits shall meet the requirements of Section 300-5. 225-24. Outdoor Lampholders. Where outdoor lampholders are attached as pendants, the connections to the circuit wires shall be staggered. Where such lampholders have terminals of a type that puncture the insulation and make contact with the conductors, they shall be attached only to conductors of the stranded type. 225-25. Location of Outdoor Lamps. Locations of lamps for outdoor lighting shall be below all energized conductors, transformers, or other electric utilization equipment. Exception No. 1: Where clearances or other safeguards are provided for relamping operations. Exception No. 2: Where equipment is controlled by a disconnecting means that can be locked in the open position. 225-26. Vegetation. Vegetation such as trees shall not be used for support of overhead conductor spans. Exception: For temporary wiring in accordance with Article 305.