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

660-9. Minimum Size of Conductors. Size No. 18 or 16 fixture wires, as specified in Section 725-16, and flexible cords shall be permitted for the control and operating circuits of X-ray and auxiliary equipment where protected by not larger than 20-ampere overcurrent devices. 660-10. Equipment Installations. All equipment for new X-ray installations and all used or reconditioned X-ray equipment moved to and reinstalled at a new location shall be of an approved type. B. Control 660-20. Fixed and Stationary Equipment. (a) Separate Control Device. A separate control device, in addition to the disconnecting means, shall be incorporated in the X-ray control supply or in the primary circuit to the high-voltage transformer. This device shall be a part of the X-ray equipment but shall be permitted in a separate enclosure immediately adjacent to the X-ray control unit. (b) Protective Device. A protective device, which shall be permitted to be incorporated into the separate control device, shall be provided to control the load resulting from failures in the high-voltage circuit. 660-21. Portable and Mobile Equipment. Portable and mobile equipment shall comply with Section 660-20, but the manually controlled device shall be located in or on the equipment. 660-23. Industrial and Commercial Laboratory Equipment. (a) Radiographic and Fluoroscopic Types. All radiographic- and fluoroscopic-type equipment shall be effectively enclosed or shall have interlocks that deenergize the equipment automatically to prevent ready access to live current-carrying parts. (b) Diffraction and Irradiation Types. Diffraction- and irradiation-type equipment shall be provided with a positive means to indicate when it is energized. The indicator shall be a pilot light, readable meter deflection, or equivalent means. Exception: Equipment or installations effectively enclosed or provided with interlocks to prevent access to live current-carrying parts during operation. 70-678 NATIONAL ELECTRICAL CODE 660-24. Independent Control. Where more than one piece of equipment is operated from the same high-voltage circuit, each piece or each group of equipment as a unit shall be provided with a high-voltage switch or equivalent disconnecting means. This disconnecting means shall be constructed, enclosed, or located so as to avoid contact by persons with its live parts. C. Transformers and Capacitors 660-35. General. Transformers and capacitors that are part of an X-ray equipment shall not be required to comply with Articles 450 and 460. 660-36. Capacitors. Capacitors shall be mounted within enclosures of insulating material or grounded metal. D. Guarding and Grounding 660-47. General. (a) High-Voltage Parts. All high-voltage parts, including X-ray tubes, shall be mounted within grounded enclosures. Air, oil, gas, or other suitable insulating media shall be used to insulate the high voltage from the grounded enclosure. The connection from the high-voltage equipment to X-ray tubes and other high-voltage components shall be made with highvoltage shielded cables. (b) Low-Voltage Cables. Low-voltage cables connecting to oil-filled units that are not completely sealed, such as transformers, condensers, oil coolers, and high-voltage switches, shall have insulation of the oilresistant type. 660-48. Grounding. Noncurrent-carrying metal parts of X-ray and associated equipment (controls, tables, X-ray tube supports, transformer tanks, shielded cables, X-ray tube heads, etc.) shall be grounded in the manner specified in Article 250. Portable and mobile equipment shall be provided with an approved grounding-type attachment plug cap. Exception: Battery-operated equipment.