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

520-47. Lamps in Scene Docks. Lamps installed in scene docks shall be so located and guarded as to be free from physical damage and shall provide an air space of not less than 2 inches (50.8 mm) between such lamps and any combustible material. 520-48. Curtain Machines. Curtain machines shall be listed. 520-49. Flue Damper Control. Where stage flue dampers are released by an electrical device, the circuit operating the device shall be normally closed and shall be controlled by at least two externally operable switches, one switch being placed on stage at either the electrician's or stage manager's station and the other where designated by the authority having jurisdiction. The device shall be designed for the full voltage of the circuit to which it is connected, no resistance being inserted. The device shall be located in the loft above the scenery and shall be enclosed in a suitable metal box having a tight, self-closing door. D. Portable Switchboards on Stage 520-50. Road-Show Connection Panel (A Type of Patch Panel). A panel designed to allow for road-show connection of portable stage switchboards to fixed lighting outlets by means of permanently installed supplementary circuits. The panel, supplementary circuits, and outlets shall comply with (a) through (d) below. (a) Load Circuits. Circuits shall terminate in grounded polarized inlets of current and voltage rating that match the fixed load receptacle. (b) Circuit Transfer. Circuits that are transferred between fixed and portable switchboards shall have both the line and neutral transferred simultaneously. (c) Overcurrent Protection. The supply devices of these supplementary circuits shall be protected by branch-circuit overcurrent protective devices. The individual supplementary circuit, within the road-show connection panel and theater, shall be protected by branch-circuit overcurrent protective devices of suitable ampacity installed within the road-show connection panel. (d) Enclosure. Panel construction shall be in accordance with Article 384. 70-570 NATIONAL ELECTRICAL CODE 520-51. Supply. Portable switchboards shall be supplied only from power outlets of sufficient voltage and ampere rating. Such power outlets shall include only externally operable, enclosed fused switches or circuit breakers mounted on stage or at the permanent switchboard in locations readily accessible from the stage floor. Provisions for connection of an equipment grounding conductor shall be provided. The neutral of feeders supplying solid-state, 3-phase, 4-wire dimmer systems shall be considered a current-carrying conductor. 520-52. Overcurrent Protection. Circuits from portable switchboards directly supplying equipment containing incandescent lamps of not over 300 watts shall be protected by overcurrent protective devices having a rating or setting of not over 20 amperes. Circuits for lampholders over 300 watts shall be permitted where overcurrent protection complies with