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

675-13. Methods of Grounding. Machines that require grounding shall have a noncurrent-carrying equipment grounding conductor provided as an integral part of each cord, cable, or raceway. This grounding conductor shall be sized not less than the largest supply conductor in each cord, cable, or raceway. Feeder circuits supplying power to irrigation machines shall have an equipment grounding conductor sized according to Table 250-95. 675-14. Bonding. Where electrical grounding is required on an irrigation machine, the metallic structure of the machine, metallic conduit, or metallic sheath of cable shall be bonded to the grounding conductor. Metal-tometal contact with a part that is bonded to the grounding conductor and the noncurrent-carrying parts of the machine shall be considered as an acceptable bonding path. 70-694 NATIONAL ELECTRICAL CODE 675-15. Lightning Protection. If an irrigation machine has a stationary point, a grounding electrode system in accordance with Article 250, Part H, shall be connected to the machine at the stationary point for lightning protection. 675-16. Energy from More than One Source. Equipment within an enclosure receiving electrical energy from more than one source shall not be required to have a disconnecting means for the additional source, provided that its voltage is 30 volts or less and meets the requirements of Section 725-31. 675-17. Connectors. External plugs and connectors on the equipment shall be of the weatherproof type. Unless provided solely for the connection of circuits meeting the requirements of. Section 725-31, external plugs and connectors shall be constructed as specified in Section 250-99(a). B. Center Pivot Irrigation Machines 675-21. General. The provisions of Part B are intended to cover additional special requirements that are peculiar to center pivot irrigation machines. See Section 675-2 for definition of "Center Pivot Irrigation Machines." 675-22. Equivalent Current Ratings. In order to establish ratings of controllers, disconnecting means, conductors, and the like, for the inherent intermittent duty of center pivot irrigation machines, the following determination shall be used: (a) Continuous-Current Rating. The equivalent continuous-current rating for the selection of branch-circuit conductors and branch-circuit devices shall be equal to 125 percent of the motor nameplate full-load current rating of the largest motor plus 60 percent of the sum of the motor nameplate full-load current ratings of all remaining motors on the circuit. (b) Locked-Rotor Current. The equivalent locked-rotor current rating shall be equal to the numerical sum of two times the locked-rotor current of the largest motor plus 80 percent of the sum of the motor nameplate full-load current ratings of all the remaining motors on the circuit.