The supply cable shall be protected by bushings where

it passes through metal and shall be so arranged that tension on the cable will not be transmitted to the connections. (FPN No. 1): See Section 520-42 for wiring of portable strips. (FPN No. 2): See Section 520-68(a), Exception No. 2 for insulation types required on single conductors. ARTICLE 520 - THEATERS AND SIMILAR LOCATIONS 70-575 520-65. Festoons. Joints in festoon wiring shall be staggered. Lamps enclosed in lanterns or similar devices of combustible material shall be equipped with guards. 520-66. Special Effects. Electrical devices used for simulating lightning, waterfalls, and the like shall be so constructed and located that flames, sparks, or hot particles cannot come in contact with combustible material. 520-67. Cable Connectors. Cable connectors, male and female, for flexible conductors shall be constructed so that tension on the cord or cable will not be transmitted to the connections. The female half shall be attached to the load end of the power supply cord or cable. The connector shall be rated in amperes and designed so that differently rated devices cannot be connected together. AC multipole connectors shall be polarized and comply with Section 410-56(f) and Section 410-58. (FPN): See Section 400-10 for pull at terminals. 520-68. Conductors for Portables. (a) Conductor Type. Flexible conductors, including cable extensions, used to supply portable stage equipment shall be listed, extra-hard usage cords or cables. Exception No. 1: Reinforced cord shall be permitted to supply stand lamps where the cord is not subject to severe physical damage and is protected by an overcurrent device rated at not over 20 amperes. Exception No. 2: A special assembly of conductors in sleeving no longer than 3.3 feet (1.0 m) shall be permitted to be employed in lieu of flexible cord if the individual wires are stranded and rated not less than 125°C (257°F) and the outer sleeve is glass fiber with a wall thickness of at least 0.025 inches (635 micrometers). Exception No. 3: Portable stage equipment requiring flexible supply conductors with a higher temperature rating where one end is permanently attached to the equipment shall be permitted to employ alternate, suitable conductors as determined by a qualified testing laboratory and recognized test standards. (b) Conductor Ampacity. The ampacity of conductors shall be as given in Section 400-5, except multiconductor listed extra-hard usage portable cords, that are not in direct contact with equipment containing heatproducing elements, shall be permitted to have their ampacity determined by Table 520-44. Maximum load current in any conductor shall not exceed the values in Table 520-44. Exception: Where alternate conductors are allowed in Exception Nos. 2 and 3 of Section 520-68(a), their ampacity shall be as given in the appropriate table in this Code for the types of conductors employed. 70-576 NATIONAL ELECTRICAL CODE 520-69. Adapters. Adapters, two-fers, and other single and multiple circuit outlet devices shall comply with (a) and (b) below. (a) No Reduction in Current Rating. Each receptacle and its corresponding cable shall have the same current and voltage rating as the plug supplying it. It shall not be utilized in a stage circuit with a greater current rating. (b) Connectors. All connectors shall be wired in accordance with Sections 520-67 and 520-68(a). F. Dressing Rooms 520-71. Pendant Lampholders. Pendant lampholders shall not be installed in dressing rooms. 520-72. Lamp Guards. All exposed incandescent lamps in dressing rooms, where less than 8 feet (2.44 m) from the floor, shall be equipped with open-end guards riveted to the outlet box cover or otherwise sealed or locked in place. 520-73. Switches Required. All lights and receptacles in dressing rooms shall be controlled by wall switches installed in the dressing rooms. Each switch controlling receptacles shall be provided with a pilot light to indicate when the receptacles are energized. G. Grounding 520-81. Grounding. All metal raceways and metal-sheathed cables shall be grounded. The metal frames and enclosures of all equipment, including border lights and portable lighting fixtures, shall be grounded. Grounding, where used, shall be in accordance with Article 250.