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Chaptewr 5 Special Occupancies | 518.2(A) | Assembly occupancies shall include, but not be limited to, the following: ArmoriesAssembly hallsAuditoriumsBowling lanesCasinos and gaming facilitiesClub roomsConference roomsCourtroomsDance hallsDining and drinking facilitiesExhibition hallsGymnasiumsMortuary chapelsMultipurpose roomsMuseumsPlaces of awaiting transportationPlaces of religious worshipPool roomsRestaurantsSkating rinks [518.2(A)](https://2023.antflix.net#518.2(A)) | https://2023.antflix.net#518.2(A) |
Chaptewr 5 Special Occupancies | 518.2(B) | Where an assembly occupancy forms a portion of a building containing other occupancies, Article 518 applies only to that portion of the building considered an assembly occupancy. Occupancy of any room or space for assembly purposes by less than 100 persons in a building of other occupancy, and incidental to such other occupancy, shall be classified as part of the other occupancy. [518.2(B)](https://2023.antflix.net#518.2(B)) | https://2023.antflix.net#518.2(B) |
Chaptewr 5 Special Occupancies | 518.2(C) | Where any such building or structure, or portion of a building or structure, contains a projection booth or stage platform or area for the presentation of theatrical or musical productions, either fixed or portable, the wiring for that area, including associated audience seating areas, and all equipment that is used in the referenced area, and portable equipment and wiring for use in the production that will not be connected to permanently installed wiring, shall comply with Article 520. Informational Note: See NFPA 101-2021, Life Safety Code, or the local building code for methods of determining population capacity. [518.2(C)](https://2023.antflix.net#518.2(C)) | https://2023.antflix.net#518.2(C) |
Chaptewr 5 Special Occupancies | 518.3 | In exhibition halls used for display booths, as in trade shows, the temporary wiring shall be permitted to be installed in accordance with Article 590. Flexible cables and cords approved for hard or extra-hard usage shall be permitted to be laid on floors where protected from contact by the general public. The ground-fault circuit-interrupter requirements of 590.6 shall not apply. All other ground-fault circuit-interrupter requirements of this Code shall apply. Where ground-fault circuit-interrupter protection for personnel is cord-and-plug-connected to the branch circuit or to the feeder, the ground-fault circuit-interrupter protection shall be listed as portable ground-fault circuit-interrupter protection or provide a level of protection equivalent to a portable ground-fault circuit interrupter, whether assembled in the field or at the factory. Exception: Where conditions of supervision and maintenance ensure that only qualified persons will service the installation, flexible cords or cables identified in Table 400.4 for hard usage or extra-hard usage shall be permitted in cable trays used only for temporary wiring. All cords or cables shall be installed in a single layer. A permanent sign shall be attached to the cable tray at intervals not to exceed 7.5 m (25 ft) and read as follows: CABLE TRAY FOR TEMPORARY WIRING ONLY [518.3](https://2023.antflix.net#518.3) | https://2023.antflix.net#518.3 |
Chaptewr 5 Special Occupancies | 518.4(A) | The wiring method shall qualify as an equipment grounding conductor in accordance with 250.118 or shall contain an equipment grounding conductor sized in accordance with Table 250.122, and shall be any of the following: Metal racewaysFlexible metal racewaysNonmetallic raceways encased in not less than 50 mm (2 in.) of concreteType MI, Type MC, or Type AC cable [518.4(A)](https://2023.antflix.net#518.4(A)) | https://2023.antflix.net#518.4(A) |
Chaptewr 5 Special Occupancies | 518.4(B) | Fixed wiring methods for specific installations shall be as follows:Audio signal processing, amplification, and reproduction equipment - 640.9Communications systems - Part IV of Article 805 and Part VI of Article 840Class 2 and Class 3 remote control and signaling circuits - Article 725, Part IIIClass 2 circuits that transmit power, data, or both to a powered deviceInformational Note: See ANSI/NEMA C137.3-2017, American National Standard for Lighting Systems - Minimum Requirements for Installation of Energy Efficient Power over Ethernet (PoE) Lighting Systems, for information on installation of cables for PoE lighting systems. See Part III of Article 760 for information on fire alarm circuits. [518.4(B)](https://2023.antflix.net#518.4(B)) | https://2023.antflix.net#518.4(B) |
Chaptewr 5 Special Occupancies | 518.4(C) | In addition to the wiring methods permitted by 518.4(A), nonmetallic-sheathed cable, electrical nonmetallic tubing, and rigid nonmetallic conduit shall be permitted to be installed in those buildings or portions of those buildings that are not required to be of fire-rated construction by the applicable building code. Informational Note: Fire-rated construction is the fire-resistive classification used in building codes. [518.4(C)](https://2023.antflix.net#518.4(C)) | https://2023.antflix.net#518.4(C) |
Chaptewr 5 Special Occupancies | 518.4(D) | Electrical nonmetallic tubing and rigid nonmetallic conduit shall be permitted to be installed in club rooms, conference and meeting rooms in hotels or motels, courtrooms, dining facilities, restaurants, mortuary chapels, museums, libraries, and places of religious worship where the following apply: The tubing or conduit is installed concealed within walls, floors, and ceilings where the walls, floors, and ceilings provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies.The tubing or conduit is installed above suspended ceilings where the suspended ceilings provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies.Electrical nonmetallic tubing and rigid nonmetallic conduit are not recognized for use in other space used for environmental air in accordance with 300.22(C).Informational Note: A finish rating is established for assemblies containing combustible (wood) supports. The finish rating is defined as the time at which the wood stud or wood joist reaches an average temperature rise of 121°C (250°F) or an individual temperature rise of 163°C (325°F) as measured on the plane of the wood nearest the fire. A finish rating is not intended to represent a rating for a membrane ceiling. [518.4(D)](https://2023.antflix.net#518.4(D)) | https://2023.antflix.net#518.4(D) |
Chaptewr 5 Special Occupancies | 518.5 | Portable switchboards, portable power distribution equipment, and commercial appliance outlet centers shall be installed in accordance with 518.5(A) through (C). [518.5](https://2023.antflix.net#518.5) | https://2023.antflix.net#518.5 |
Chaptewr 5 Special Occupancies | 518.5(A)(1) | Power outlets and commercial appliance outlet centers shall provide overcurrent protection or shall be protected by overcurrent devices. [518.5(A)(1)](https://2023.antflix.net#518.5(A)(1)) | https://2023.antflix.net#518.5(A)(1) |
Chaptewr 5 Special Occupancies | 518.5(A)(2) | Overcurrent devices, power outlets, and commercial appliance outlet centers shall not be accessible to the general public. [518.5(A)(2)](https://2023.antflix.net#518.5(A)(2)) | https://2023.antflix.net#518.5(A)(2) |
Chaptewr 5 Special Occupancies | 518.5(A)(3) | Connecting means for an equipment grounding conductor shall be provided. [518.5(A)(3)](https://2023.antflix.net#518.5(A)(3)) | https://2023.antflix.net#518.5(A)(3) |
Chaptewr 5 Special Occupancies | 518.5(A)(4) | Power outlets and commercial appliance outlet centers shall be marked as follows: FOR USE BY QUALIFIED PERSONS ONLY. RISK OF ELECTRIC SHOCK.Disconnect all power before servicing. Disconnecting means location: [518.5(A)(4)](https://2023.antflix.net#518.5(A)(4)) | https://2023.antflix.net#518.5(A)(4) |
Chaptewr 5 Special Occupancies | 518.5(A)(5) | A panelboard installed in a listed commercial appliance outlet center designed for in-floor mounting shall be permitted to be orientated in the face-up position, if such orientation is part of the listing, and 408.43 shall not apply. [518.5(A)(5)](https://2023.antflix.net#518.5(A)(5)) | https://2023.antflix.net#518.5(A)(5) |
Chaptewr 5 Special Occupancies | 518.5(B) | Portable switchboards and portable power distribution equipment shall be supplied only from listed power outlets or listed commercial appliance outlet centers, each having sufficient voltage and ampere ratings. [518.5(B)](https://2023.antflix.net#518.5(B)) | https://2023.antflix.net#518.5(B) |
Chaptewr 5 Special Occupancies | 518.5(C) | The neutral conductor of feeders supplying solid-state phase control, 3-phase, 4-wire dimmer systems shall be considered a current-carrying conductor for purposes of ampacity adjustment. The neutral conductor of feeders supplying solid-state sine wave, 3-phase, 4-wire dimming systems shall not be considered a current-carrying conductor for purposes of ampacity adjustment. Exception: The neutral conductor of feeders supplying systems that use or are capable of using both phase-control and sine-wave dimmers shall be considered as current-carrying for purposes of ampacity adjustment. Informational Note: See Article 100 for definitions of solid-state dimmer types. [518.5(C)](https://2023.antflix.net#518.5(C)) | https://2023.antflix.net#518.5(C) |
Chaptewr 5 Special Occupancies | 518.6 | Illumination shall be provided for all working spaces about fixed service equipment, switchboards, switchgear, panelboards, or motor control centers installed outdoors that serve assembly occupancies. Control by automatic means only shall not be permitted. Additional lighting outlets shall not be required where the workspace is illuminated by an adjacent light source. [518.6](https://2023.antflix.net#518.6) | https://2023.antflix.net#518.6 |
Chaptewr 5 Special Occupancies | 520.1 | This article covers all buildings or that part of a building or structure, indoor or outdoor, designed or used for presentation, dramatic, musical, motion picture projection, or similar purposes and to specific audience seating areas within motion picture or television studios. [520.1](https://2023.antflix.net#520.1) | https://2023.antflix.net#520.1 |
Chaptewr 5 Special Occupancies | 520.5(A) | The fixed wiring method shall be any of the following: Metal racewaysNonmetallic raceways encased in at least 50 mm (2 in.) of concreteType MI cable, Type MC cable, or Type AC cable containing an insulated equipment grounding conductor sized in accordance with Table 250.122 [520.5(A)](https://2023.antflix.net#520.5(A)) | https://2023.antflix.net#520.5(A) |
Chaptewr 5 Special Occupancies | 520.5(B) | Fixed wiring methods for specific installations shall be as follows: Audio signal processing, amplification, and reproduction equipment - 640.9Communications systems - Parts I and IV of Article 800, Part IV of Article 805, and Part VI of Article 840Class 2 and Class 3 remote control and signaling circuits - Part III of Article 725Class 2 circuits that transmit power, data, or both to a powered deviceInformational Note: See ANSI/NEMA C137.3-2017, American National Standard for Lighting Systems - Minimum Requirements for Installation of Energy Efficient Power over Ethernet (PoE) Lighting Systems, for information on installation of cables for PoE lighting systems. See Part III of Article 760 for information on fire alarm circuits. [520.5(B)](https://2023.antflix.net#520.5(B)) | https://2023.antflix.net#520.5(B) |
Chaptewr 5 Special Occupancies | 520.5(C) | The wiring for portable switchboards, stage set lighting, stage effects, and other wiring not fixed as to location shall be permitted with approved flexible cords and cables as provided elsewhere in Article 520. Fastening such cables and cords by uninsulated staples or nailing shall not be permitted. [520.5(C)](https://2023.antflix.net#520.5(C)) | https://2023.antflix.net#520.5(C) |
Chaptewr 5 Special Occupancies | 520.5(D) | Nonmetallic-sheathed cable, Type AC cable, electrical nonmetallic tubing, and rigid nonmetallic conduit shall be permitted to be installed in those buildings or portions of buildings that are not required to be of fire-rated construction by the applicable building code. [520.5(D)](https://2023.antflix.net#520.5(D)) | https://2023.antflix.net#520.5(D) |
Chaptewr 5 Special Occupancies | 520.6 | The number of conductors permitted in any metal conduit, rigid nonmetallic conduit as permitted in this article, or electrical metallic tubing for circuits or for remote-control conductors shall not exceed the percentage fill shown in Table 1 of Chapter 9. Where contained within an auxiliary gutter or a wireway, the sum of the cross-sectional areas of all contained conductors at any cross section shall not exceed 20 percent of the interior cross-sectional area of the auxiliary gutter or wireway. The 30-conductor limitation of 366.22 and 376.22 shall not apply. [520.6](https://2023.antflix.net#520.6) | https://2023.antflix.net#520.6 |
Chaptewr 5 Special Occupancies | 520.9 | A branch circuit of any size supplying one or more receptacles shall be permitted to supply stage set lighting. The voltage rating of the receptacles shall be not less than the circuit voltage. Receptacle ampere ratings and branch-circuit conductor ampacity shall be not less than the branch-circuit overcurrent device ampere rating. Table 210.21(B)(2) and 210.23 shall not apply. The requirements in 210.8(B), other than 210.8(B)(6), shall apply. [520.9](https://2023.antflix.net#520.9) | https://2023.antflix.net#520.9 |
Chaptewr 5 Special Occupancies | 520.10 | Portable stage and studio lighting equipment and portable power distribution equipment not identified for outdoor use shall be permitted for temporary use outdoors if the equipment is supervised by qualified personnel while energized and barriered from the general public. Informational Note: See ANSI/ESTA E1.58-2017, Electrical Safely Standard for Portable Stage and Studio Equipment Used Outdoors, for information on the use of portable stage and studio lighting equipment outdoors. [520.10](https://2023.antflix.net#520.10) | https://2023.antflix.net#520.10 |
Chaptewr 5 Special Occupancies | 520.21 | Fixed stage switchboards shall comply with the following: Fixed stage switchboards shall be listed.Fixed stage switchboards shall be readily accessible but shall not be required to be located on or adjacent to the stage. Multiple fixed stage switchboards shall be permitted at different locations.A fixed stage switchboard shall contain overcurrent protective devices for all branch circuits supplied by that switchboard.A fixed stage switchboard shall be permitted to supply both stage and nonstage equipment.Fixed stage switchboards shall comply with the marking and working space requirements in 408.18(C) but shall not be required to comply with the load terminal location requirements in 408.18(C)(1), (C)(2), and (C)(3). [520.21](https://2023.antflix.net#520.21) | https://2023.antflix.net#520.21 |
Chaptewr 5 Special Occupancies | 520.25 | Dimmers shall comply with 520.25(A) through (C). [520.25](https://2023.antflix.net#520.25) | https://2023.antflix.net#520.25 |
Chaptewr 5 Special Occupancies | 520.25(A) | If dimmers are installed in ungrounded conductors, each dimmer shall have overcurrent protection not greater than 125 percent of the dimmer rating and shall be disconnected from all ungrounded conductors where the master or individual switch or circuit breaker supplying such dimmer is in the open position. [520.25(A)](https://2023.antflix.net#520.25(A)) | https://2023.antflix.net#520.25(A) |
Chaptewr 5 Special Occupancies | 520.25(B) | The circuit supplying an autotransformer-type dimmer shall not exceed 150 volts between conductors. The grounded conductor shall be common to the input and output circuits. Informational Note: See 210.9 for circuits derived from auto-transformers. [520.25(B)](https://2023.antflix.net#520.25(B)) | https://2023.antflix.net#520.25(B) |
Chaptewr 5 Special Occupancies | 520.25(C) | The circuit supplying a solid-state dimmer shall not exceed 150 volts between conductors unless the dimmer is listed specifically for higher voltage operation. Where a grounded conductor supplies a dimmer, it shall be common to the input and output circuits. Dimmer chassis shall be connected to the equipment grounding conductor. [520.25(C)](https://2023.antflix.net#520.25(C)) | https://2023.antflix.net#520.25(C) |
Chaptewr 5 Special Occupancies | 520.26 | A stage switchboard shall be either one or a combination of the types specified in 520.26(A), (B), (C), and (D). [520.26](https://2023.antflix.net#520.26) | https://2023.antflix.net#520.26 |
Chaptewr 5 Special Occupancies | 520.26(A) | Dimmers and switches are operated by handles mechanically linked to the control devices. [520.26(A)](https://2023.antflix.net#520.26(A)) | https://2023.antflix.net#520.26(A) |
Chaptewr 5 Special Occupancies | 520.26(B) | Devices are operated electrically from a pilot-type control console or panel. Pilot control panels either shall be part of the switchboard or shall be permitted to be at another location. [520.26(B)](https://2023.antflix.net#520.26(B)) | https://2023.antflix.net#520.26(B) |
Chaptewr 5 Special Occupancies | 520.26(C) | A stage switchboard with circuit interconnections is a secondary switchboard (patch panel) or panelboard remote to the primary stage switchboard. It shall contain overcurrent protection. Where the required branch-circuit overcurrent protection is provided in the dimmer panel, it shall be permitted to be omitted from the intermediate switchboard. [520.26(C)](https://2023.antflix.net#520.26(C)) | https://2023.antflix.net#520.26(C) |
Chaptewr 5 Special Occupancies | 520.26(D) | A stage switchboard containing only over-current protective devices and no control elements. [520.26(D)](https://2023.antflix.net#520.26(D)) | https://2023.antflix.net#520.26(D) |
Chaptewr 5 Special Occupancies | 520.27(A) | Feeders supplying stage switchboards shall be one of the types in 520.27 (A)(1) through (A)(3). [520.27(A)](https://2023.antflix.net#520.27(A)) | https://2023.antflix.net#520.27(A) |
Chaptewr 5 Special Occupancies | 520.27(A)(1) | A single feeder disconnected by a single disconnect device. [520.27(A)(1)](https://2023.antflix.net#520.27(A)(1)) | https://2023.antflix.net#520.27(A)(1) |
Chaptewr 5 Special Occupancies | 520.27(A)(2) | Multiple feeders of unlimited quantity shall be permitted, provided that all multiple feeders are part of a single system. Where combined, neutral conductors in a given raceway shall be of sufficient ampacity to carry the maximum unbalanced current supplied by multiple feeder conductors in the same raceway, but they need not be greater than the ampacity of the neutral conductor supplying the primary stage switchboard. Parallel neutral conductors shall comply with 310.10(G). [520.27(A)(2)](https://2023.antflix.net#520.27(A)(2)) | https://2023.antflix.net#520.27(A)(2) |
Chaptewr 5 Special Occupancies | 520.27(A)(3) | Installations with separate feeders to a single primary stage switchboard shall have a disconnecting means for each feeder. The primary stage switchboard shall have a permanent and obvious label stating the number and location of disconnecting means. If the disconnecting means are located in more than one distribution switchboard, the primary stage switchboard shall be provided with barriers to correspond with these multiple locations. [520.27(A)(3)](https://2023.antflix.net#520.27(A)(3)) | https://2023.antflix.net#520.27(A)(3) |
Chaptewr 5 Special Occupancies | 520.27(B) | the purpose of ampacity adjustment, the following shall apply: The neutral conductor of feeders supplying solid-state, phase-control 3-phase, 4-wire dimming systems shall be considered a current-carrying conductor.The neutral conductor of feeders supplying solid-state, sine wave 3-phase, 4-wire dimming systems shall not be considered a current-carrying conductor.The neutral conductor of feeders supplying systems that use or are capable of using both phase-control and sine wave dimmers shall be considered as current-carrying. [520.27(B)](https://2023.antflix.net#520.27(B)) | https://2023.antflix.net#520.27(B) |
Chaptewr 5 Special Occupancies | 520.27(C) | For the purposes of calculating supply capacity to switchboards, considering the maximum load that the switchboard is intended to control in a given installation shall be permitted if the following apply: All feeders supplying the switchboard shall be protected by an overcurrent device with a rating not greater than the ampacity of the feeder.The opening of the overcurrent device shall not affect the proper operation of the egress or emergency lighting systems.Informational Note: See 220.40 for calculation of stage switchboard feeder loads. [520.27(C)](https://2023.antflix.net#520.27(C)) | https://2023.antflix.net#520.27(C) |
Chaptewr 5 Special Occupancies | 520.40 | Where a stage lighting hoist is listed as a complete assembly and contains an integral cable-handling system and cable to connect a moving wiring device to a fixed junction box for connection to permanent wiring, the extra-hard usage requirement of 520.44(C)(1) shall not apply. [520.40](https://2023.antflix.net#520.40) | https://2023.antflix.net#520.40 |
Chaptewr 5 Special Occupancies | 520.41(A) | Footlights, border lights, and proscenium sidelights shall be arranged so that no branch circuit supplying such equipment carries a load exceeding 20 amperes. [520.41(A)](https://2023.antflix.net#520.41(A)) | https://2023.antflix.net#520.41(A) |
Chaptewr 5 Special Occupancies | 520.41(B) | Where only heavy-duty lampholders are used, such circuits shall be permitted to comply with Article 210 for circuits supplying heavy-duty lampholders. [520.41(B)](https://2023.antflix.net#520.41(B)) | https://2023.antflix.net#520.41(B) |
Chaptewr 5 Special Occupancies | 520.42 | Foot, border, proscenium, or portable strip lights and connector strips shall be wired with conductors that have insulation suitable for the temperature at which the conductors are operated, but not less than 125°C (257°F). The ampacity of the 125°C (257°F) conductors shall be that of 60°C (140°F) conductors. All drops from connector strips shall be 90°C (194°F) wire sized to the ampacity of 60°C (140°F) cords and cables with no more than 150 mm (6 in.) of conductor extending into the connector strip. Section 310.15(C)(1) shall not apply. Informational Note: See Table 310.4(1) for conductor types. [520.42](https://2023.antflix.net#520.42) | https://2023.antflix.net#520.42 |
Chaptewr 5 Special Occupancies | 520.43(A) | Where metal trough construction is employed for footlights, the trough containing the circuit conductors shall be made of sheet metal not lighter than 0.81 mm (0.032 in.) and treated to prevent oxidation. Lampholder terminals shall be kept at least 13 mm (1/2 in.) from the metal of the trough. The circuit conductors shall be soldered to the lampholder terminals. [520.43(A)](https://2023.antflix.net#520.43(A)) | https://2023.antflix.net#520.43(A) |
Chaptewr 5 Special Occupancies | 520.43(B) | Where the metal trough construction specified in 520.43(A) is not used, footlights shall consist of individual outlets with lampholders wired with rigid metal conduit, intermediate metal conduit, or flexible metal conduit, Type MC cable, or mineral-insulated, metal-sheathed cable. The circuit conductors shall be soldered to the lampholder terminals. [520.43(B)](https://2023.antflix.net#520.43(B)) | https://2023.antflix.net#520.43(B) |
Chaptewr 5 Special Occupancies | 520.43(C) | Disappearing footlights shall be arranged so that the current supply is automatically disconnected when the footlights are replaced in the storage recesses designed for them. [520.43(C)](https://2023.antflix.net#520.43(C)) | https://2023.antflix.net#520.43(C) |
Chaptewr 5 Special Occupancies | 520.44(A) | Borders and proscenium sidelights shall be as follows: Constructed as specified in 520.43Suitably stayed and supportedDesigned so that the flanges of the reflectors or other guards protect the lamps from mechanical damage and from accidental contact with scenery or other combustible material [520.44(A)](https://2023.antflix.net#520.44(A)) | https://2023.antflix.net#520.44(A) |
Chaptewr 5 Special Occupancies | 520.44(B) | Connector strips and drop boxes shall be as follows: Suitably stayed and supportedListed as stage and studio wiring devices [520.44(B)](https://2023.antflix.net#520.44(B)) | https://2023.antflix.net#520.44(B) |
Chaptewr 5 Special Occupancies | 520.44(C)(1) | Cords and cables for supply to border lights, drop boxes, and connector strips shall be listed for extra-hard usage. The cords and cables shall be suitably supported. Such cords and cables shall be employed only where flexible conductors are necessary. Ampacity of the conductors shall be as provided in 400.5. [520.44(C)(1)](https://2023.antflix.net#520.44(C)(1)) | https://2023.antflix.net#520.44(C)(1) |
Chaptewr 5 Special Occupancies | 520.44(C)(2) | Listed multiconductor extra-hard usage type cords and cables not in direct contact with equipment containing heat-producing elements shall be permitted to have their ampacity determined by Table 520.44(C)(2)(1). Maximum load current in any conductor with an ampacity determined by Table 520.44(C)(2)(1) shall not exceed the values in Table 520.44(C)(2)(1).Table 520.44(C)(2)(1) Ampacity of Listed Extra-Hard Usage Cords and Cables with Temperature Ratings of 75°C (167°F) and 90°C (194°F) [Based on Ambient Temperature of 30°C (86°F)] Size(AWG) Temperature Rating of Cords and Cables MaximumRating ofOvercurrentDevice 75°C(167°F) 90°C(194°F) 14 24 28 15 12 32 35 20 10 41 47 25 8 57 65 35 6 77 87 45 4 101 114 60 2 133 152 80 Note: Ampacity shown is the ampacity for multiconductor cords and cables where only three copper conductors are current-carrying in accordance with 400.5. If the number of current-carrying conductors in a cord or cable exceeds three and the load diversity is 50 percent or less, the ampacity of each conductor shall be reduced as shown in Table 520.44(C)(2)(2):Informational Note: For the purposes of Table 520.44(C)(2)(1), load diversity is the percentage of the total current of all simultaneously energized circuits fed by the cable to the sum of the ampacities of all pairs of circuit conductors in that cable. Table 520.44(C)(2)(2) Ampacity Adjustment Factors for More Than Three Current-Carrying Conductors in a Cord or Cable Where Load Diversity Is 50 Percent or Less Number of Conductors Percent of Ampacity Value in Table 520.44(C)(2)(a) 4—6 80 7—24 70 25—42 60 43 and above 50 Note: Ultimate insulation temperature. In no case shall conductors be associated together in such a way with respect to the kind of circuit, the wiring method used, or the number of conductors such that the temperature limit of the conductors is exceeded. A neutral conductor that carries only the unbalanced current from other conductors of the same circuit need not be considered as a current-carrying conductor. In a 3-wire circuit consisting of two-phase conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system, the neutral conductor carries approximately the same current as the line-to-neutral currents of the other conductors and shall be considered to be a current-carrying conductor. On a 4-wire, 3-phase wye circuit where the major portion of the load consists of nonlinear loads, there are harmonic currents in the neutral conductor. Therefore, the neutral conductor shall be considered to be a current-carrying conductor. [520.44(C)(2)](https://2023.antflix.net#520.44(C)(2)) | https://2023.antflix.net#520.44(C)(2) |
Chaptewr 5 Special Occupancies | 520.44(C)(3) | Neutral conductors shall be white without stripe or shall be identified by a distinctive white marking at their terminations. Equipment grounding conductors shall be green with or without yellow stripe or shall be identified by a distinctive green marking at their terminations. [520.44(C)(3)](https://2023.antflix.net#520.44(C)(3)) | https://2023.antflix.net#520.44(C)(3) |
Chaptewr 5 Special Occupancies | 520.45 | Receptacles for electrical equipment on stages shall be rated in amperes. Conductors supplying receptacles shall be in accordance with Articles 310 and 400. [520.45](https://2023.antflix.net#520.45) | https://2023.antflix.net#520.45 |
Chaptewr 5 Special Occupancies | 520.46 | Receptacles for the connection of portable stage-lighting equipment shall be pendant or mounted in pockets or enclosures and shall comply with 520.45. Supply cables for connector strips and drop boxes shall be as specified in 520.44(C). [520.46](https://2023.antflix.net#520.46) | https://2023.antflix.net#520.46 |
Chaptewr 5 Special Occupancies | 520.47 | Lamps (bare bulbs) installed in backstage and ancillary areas where they can come in contact with scenery shall be located and guarded so as to be free from physical damage and shall provide an air space of not less than 50 mm (2 in.) between such lamps and any combustible material. Exception: Decorative lamps installed in scenery shall not be considered to be backstage lamps for the purpose of this section. [520.47](https://2023.antflix.net#520.47) | https://2023.antflix.net#520.47 |
Chaptewr 5 Special Occupancies | 520.48 | Curtain machines shall be listed. [520.48](https://2023.antflix.net#520.48) | https://2023.antflix.net#520.48 |
Chaptewr 5 Special Occupancies | 520.49 | Where stage smoke ventilators 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 at a readily accessible location on stage 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 enclosed in a metal box having a door that shall remain closed except during service to the equipment. [520.49](https://2023.antflix.net#520.49) | https://2023.antflix.net#520.49 |
Chaptewr 5 Special Occupancies | 520.50 | 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 520.50(A) through (D). [520.50](https://2023.antflix.net#520.50) | https://2023.antflix.net#520.50 |
Chaptewr 5 Special Occupancies | 520.50(A) | Circuits shall originate from grounding-type polarized inlets of current and voltage rating that match the fixed-load receptacle. [520.50(A)](https://2023.antflix.net#520.50(A)) | https://2023.antflix.net#520.50(A) |
Chaptewr 5 Special Occupancies | 520.50(B) | Circuits that are transferred between fixed and portable switchboards shall have all circuit conductors transferred simultaneously. [520.50(B)](https://2023.antflix.net#520.50(B)) | https://2023.antflix.net#520.50(B) |
Chaptewr 5 Special Occupancies | 520.50(C) | The supply devices of these supplementary circuits shall be protected by branch-circuit overcurrent protective devices. Each supplementary circuit, within the road show connection panel and theater, shall be protected by branch-circuit overcurrent protective devices installed within the road show connection panel. [520.50(C)](https://2023.antflix.net#520.50(C)) | https://2023.antflix.net#520.50(C) |
Chaptewr 5 Special Occupancies | 520.50(D) | Panel construction shall be in accordance with Article 408. [520.50(D)](https://2023.antflix.net#520.50(D)) | https://2023.antflix.net#520.50(D) |
Chaptewr 5 Special Occupancies | 520.51 | 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. For the purposes of ampacity adjustment, the requirements of 520.27(B) shall apply. [520.51](https://2023.antflix.net#520.51) | https://2023.antflix.net#520.51 |
Chaptewr 5 Special Occupancies | 520.52 | Portable switchboards shall contain overcurrent protection for branch circuits. The requirements of 210.23 shall not apply. [520.52](https://2023.antflix.net#520.52) | https://2023.antflix.net#520.52 |
Chaptewr 5 Special Occupancies | 520.53 | Portable stage switchboards shall be listed and shall comply with 520.53(A) through (E). The load terminal location requirements in 408.18(C)(1), (C)(2), and (C)(3) shall not apply to portable stage switchboards. [520.53](https://2023.antflix.net#520.53) | https://2023.antflix.net#520.53 |
Chaptewr 5 Special Occupancies | 520.53(A) | A pilot light shall be provided for each ungrounded conductor feeding the switchboard. The pilot light(s) shall be connected to the incoming feeder so that operation of the main overcurrent protective device or master switch shall not affect the operation of the pilot light(s). [520.53(A)](https://2023.antflix.net#520.53(A)) | https://2023.antflix.net#520.53(A) |
Chaptewr 5 Special Occupancies | 520.53(B) | In portable switchboard equipment designed for use with 3-phase, 4-wire with ground supply, the current rating of the supply neutral terminal, and the ampacity of its associated busbar or wiring, or both, shall have an ampacity equal to at least twice the ampacity of the largest ungrounded supply terminal. Exception: Where portable switchboard equipment is specifically constructed, and identified to be internally converted in the field, in an approved, manner, from use with a balanced 3-phase, 4-wire with ground supply to a balanced, single-phase, 3-wire with ground supply, the supply neutral terminal and its associated busbar, wiring, or both, shall have an ampacity equal to at least that of the largest ungrounded single-phase supply terminal. [520.53(B)](https://2023.antflix.net#520.53(B)) | https://2023.antflix.net#520.53(B) |
Chaptewr 5 Special Occupancies | 520.53(C) | Single-pole separable connectors shall comply with 406.13. Sections 400.14, 406.7, and 406.8 shall not apply to listed single-pole separable connectors and single-conductor cable assemblies utilizing listed single-pole separable connectors. Where paralleled sets of current-carrying, single-pole separable connectors are provided as input devices, they shall be prominently labeled with a warning indicating the presence of internal parallel connections. [520.53(C)](https://2023.antflix.net#520.53(C)) | https://2023.antflix.net#520.53(C) |
Chaptewr 5 Special Occupancies | 520.53(D) | Where a portable stage switchboard contains a feed-through outlet of the same rating as its supply inlet, the feed-through outlet shall not require overcurrent protection in the switchboard. [520.53(D)](https://2023.antflix.net#520.53(D)) | https://2023.antflix.net#520.53(D) |
Chaptewr 5 Special Occupancies | 520.53(E) | All conductors other than busbars within the switchboard enclosure shall be stranded. [520.53(E)](https://2023.antflix.net#520.53(E)) | https://2023.antflix.net#520.53(E) |
Chaptewr 5 Special Occupancies | 520.54(A) | The supply to a portable stage switchboard shall be by means of listed extra-hard usage cords or cables. The supply cords or cables shall terminate within the switchboard enclosure in an externally operable fused master switch or circuit breaker or in an identified connector assembly. The supply cords or cable (and connector assembly) shall have current ratings not less than the total load connected to the switchboard and shall be protected by overcurrent devices. [520.54(A)](https://2023.antflix.net#520.54(A)) | https://2023.antflix.net#520.54(A) |
Chaptewr 5 Special Occupancies | 520.54(B) | The power supply conductors for portable stage switchboards utilizing solid-state phase control dimmers shall be sized considering the neutral conductor as a current-carrying conductor for ampacity adjustment purposes. The power supply conductors for portable stage switchboards utilizing only solid-state sine wave dimmers shall be sized considering the neutral conductor as a non-current carrying conductor for ampacity adjustment purposes. [520.54(B)](https://2023.antflix.net#520.54(B)) | https://2023.antflix.net#520.54(B) |
Chaptewr 5 Special Occupancies | 520.54(C) | Single-conductor portable supply cable sets shall be not smaller than 2 AWG conductors. The equipment grounding conductor shall not be smaller than 6 AWG conductor. Single-conductor grounded neutral cables for a supply shall be sized in accordance with 520.54(J). Where single conductors are paralleled for increased ampacity, the paralleled conductors shall be of the same length and size. Single-conductor supply cables shall be grouped together but not bundled. The equipment grounding conductor shall be permitted to be of a different type if it meets the other requirements of this section, and it shall be permitted to be reduced in size in accordance with 250.122. Grounded (neutral) and equipment grounding conductors shall be identified in accordance with 200.6, 250.119, and 310.6. Grounded conductors shall be permitted to be identified by marking at least the first 150 mm (6 in.) from both ends of each length of conductor with white or gray. Equipment grounding conductors shall be permitted to be identified by marking at least the first 150 mm (6 in.) from both ends of each length of conductor with green or green with yellow stripes. Where more than one nominal voltage exists within the same premises, each ungrounded conductor shall be identified by system. [520.54(C)](https://2023.antflix.net#520.54(C)) | https://2023.antflix.net#520.54(C) |
Chaptewr 5 Special Occupancies | 520.54(D) | Where supply conductors do not exceed 3 m (10 ft) in length between supply and switchboard or supply and a subsequent overcurrent device, the supply conductors shall be permitted to be reduced in size where all of the following conditions are met: The ampacity of the supply conductors shall be at least one-quarter of the current rating of the supply overcurrent protective device.The supply conductors shall terminate in a single over-current protective device that will limit the load to the ampacity of the supply conductors. This single overcurrent device shall be permitted to supply additional over-current devices on its load side.The supply conductors shall not penetrate walls, floors, or ceilings or be run through doors or traffic areas. The supply conductors shall be protected from physical damage.The supply conductors shall be suitably terminated in an approved manner.Conductors shall be continuous without splices or connectors.Conductors shall not be bundled.Conductors shall be supported above the floor in an approved manner. [520.54(D)](https://2023.antflix.net#520.54(D)) | https://2023.antflix.net#520.54(D) |
Chaptewr 5 Special Occupancies | 520.54(E) | Where supply conductors do not exceed 6 m (20 ft) in length between supply and switchboard or supply and a subsequent overcurrent protection device, the supply conductors shall be permitted to be reduced in size where all of the following conditions are met: The ampacity of the supply conductors shall be at least one-half of the current rating of the supply overcurrent protective device.The supply conductors shall terminate in a single over-current protective device that limits the load to the ampacity of the supply conductors. This single overcurrent device shall be permitted to supply additional over-current devices on its load side.The supply conductors shall not penetrate walls, floors, or ceilings or be run through doors or traffic areas. The supply conductors shall be adequately protected from physical damage.The supply conductors shall be suitably terminated in an approved manner.The supply conductors shall be supported in an approved manner at least 2.1 m (7 ft) above the floor except at terminations.The supply conductors shall not be bundled.Tap conductors shall be in unbroken lengths. [520.54(E)](https://2023.antflix.net#520.54(E)) | https://2023.antflix.net#520.54(E) |
Chaptewr 5 Special Occupancies | 520.54(F) | Supply conductors not reduced in size under 520.54(D) or (E) shall be permitted to pass through holes in walls specifically designed for the purpose. If penetration is through the fire-resistant—rated wall, it shall be in accordance with 300.21. [520.54(F)](https://2023.antflix.net#520.54(F)) | https://2023.antflix.net#520.54(F) |
Chaptewr 5 Special Occupancies | 520.54(G) | All supply conductors and connectors shall be protected against physical damage by an approved means. This protection shall not be required to be raceways. [520.54(G)](https://2023.antflix.net#520.54(G)) | https://2023.antflix.net#520.54(G) |
Chaptewr 5 Special Occupancies | 520.54(H) | Where connectors are used in a supply conductor, there shall be a maximum number of three interconnections (mated connector pairs) where the total length from supply to switchboard does not exceed 30 m (100 ft). In cases where the total length from supply to switchboard exceeds 30 m (100 ft), one additional interconnection shall be permitted for each additional 30 m (100 ft) of supply conductor. [520.54(H)](https://2023.antflix.net#520.54(H)) | https://2023.antflix.net#520.54(H) |
Chaptewr 5 Special Occupancies | 520.54(I) | Where single-pole portable cable connectors are used, they shall be listed and of the locking type. Sections 406.7 and 406.8 shall not apply to listed single-pole separable connectors and single-conductor cable assemblies utilizing listed single-pole separable connectors. [520.54(I)](https://2023.antflix.net#520.54(I)) | https://2023.antflix.net#520.54(I) |
Chaptewr 5 Special Occupancies | 520.54(J) | Supply neutral conductors shall comply with 520.54(J)(1) and (J)(2). [520.54(J)](https://2023.antflix.net#520.54(J)) | https://2023.antflix.net#520.54(J) |
Chaptewr 5 Special Occupancies | 520.54(J)(1) | Grounded neutral conductors shall be permitted to be identified by marking at least the first 150 mm (6 in.) from both ends of each length of conductor with white or gray. [520.54(J)(1)](https://2023.antflix.net#520.54(J)(1)) | https://2023.antflix.net#520.54(J)(1) |
Chaptewr 5 Special Occupancies | 520.54(J)(2) | Where single-conductor feeder cables not installed in raceways are used on multiphase circuits feeding portable stage switchboards containing solid-state phase-control dimmers, the grounded neutral conductor shall have an ampacity of at least 130 percent of the ungrounded circuit conductors feeding the portable stage switchboard. Where such feeders are supplying only solid-state sine wave dimmers, the grounded neutral conductor shall have an ampacity of at least 100 percent of the ungrounded circuit conductors feeding the portable stage switchboard. [520.54(J)(2)](https://2023.antflix.net#520.54(J)(2)) | https://2023.antflix.net#520.54(J)(2) |
Chaptewr 5 Special Occupancies | 520.54(K) | The routing of portable supply conductors, the making and breaking of supply connectors and other supply connections, and the energization and de-energization of supply services shall be performed by qualified persons, and portable switchboards shall be so marked, indicating this requirement in a permanent and conspicuous manner. Exception: A portable switchboard shall be permitted, to be connected to a permanently installed supply receptacle by other than qualified persons provided that the supply receptacle is protected for its current rating by an overcurrent device of not greater than 150 amperes, and where the receptacle, interconnection, and switchboard comply with all of the following: (1) They employ listed multipole connectors for every supply interconnection. (2) They prevent access to all supply connections by the general public. (3) They employ listed extra-hard usage multiconductor cords or cables with an ampacity not less than the load and not less than the ampere rating of the connectors. [520.54(K)](https://2023.antflix.net#520.54(K)) | https://2023.antflix.net#520.54(K) |
Chaptewr 5 Special Occupancies | 520.61 | Arc lamps, including enclosed arc lamps and associated ballasts, shall be listed. Interconnecting cord sets and interconnecting cords and cables shall be extra-hard usage type and listed. [520.61](https://2023.antflix.net#520.61) | https://2023.antflix.net#520.61 |
Chaptewr 5 Special Occupancies | 520.62 | Portable power distribution units shall comply with the requirements of 520.62(A) and (B). [520.62](https://2023.antflix.net#520.62) | https://2023.antflix.net#520.62 |
Chaptewr 5 Special Occupancies | 520.62(A) | Portable power distribution units shall be listed. [520.62(A)](https://2023.antflix.net#520.62(A)) | https://2023.antflix.net#520.62(A) |
Chaptewr 5 Special Occupancies | 520.62(B) | Portable power distribution equipment fed by single-conductor feeder systems shall comply with the requirements of 520.53(C) and (D) and 520.54. [520.62(B)](https://2023.antflix.net#520.62(B)) | https://2023.antflix.net#520.62(B) |
Chaptewr 5 Special Occupancies | 520.63(A) | Brackets for use on scenery shall be wired internally, and the fixture stem shall be carried through to the back of the scenery where a bushing shall be placed on the end of the stem. Externally wired brackets or other fixtures shall be permitted where wired with cords designed for hard usage that extend through scenery and without joint or splice in canopy of fixture back and terminate in an approved-type stage connector located, where practical, within 450 mm (18 in.) of the fixture. [520.63(A)](https://2023.antflix.net#520.63(A)) | https://2023.antflix.net#520.63(A) |
Chaptewr 5 Special Occupancies | 520.63(B) | Fixtures shall be securely fastened in place. [520.63(B)](https://2023.antflix.net#520.63(B)) | https://2023.antflix.net#520.63(B) |
Chaptewr 5 Special Occupancies | 520.64 | Portable strips shall be constructed in accordance with the requirements for border lights and proscenium sidelights in 520.44(A). The supply cable shall be protected by bushings where it passes through metal and shall be arranged so that tension on the cable will not be transmitted to the connections. Informational Note No. 1: See 520.42 for wiring of portable strips. Informational Note No. 2: See 520.68(A)(4) for insulation types required on single conductors. [520.64](https://2023.antflix.net#520.64) | https://2023.antflix.net#520.64 |
Chaptewr 5 Special Occupancies | 520.65 | Joints in festoon wiring 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. Lamps enclosed in lanterns or similar devices of combustible material shall be equipped with guards. [520.65](https://2023.antflix.net#520.65) | https://2023.antflix.net#520.65 |
Chaptewr 5 Special Occupancies | 520.66 | Electrical devices used for simulating lightning, waterfalls, and the like shall be constructed and located so that flames, sparks, or hot particles cannot come in contact with combustible material. [520.66](https://2023.antflix.net#520.66) | https://2023.antflix.net#520.66 |
Chaptewr 5 Special Occupancies | 520.67 | Multipole branch-circuit cable connectors, male and female, for flexible conductors shall be constructed so that tension on the cord or cable is not 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; however, a 20-ampere T-slot receptacle shall be permitted to accept a 15-ampere attachment plug of the same voltage rating. Alternating-current multipole connectors shall be polarized and comply with 406.7 and 406.10. Informational Note: See 400.14 for pull at terminals. [520.67](https://2023.antflix.net#520.67) | https://2023.antflix.net#520.67 |
Chaptewr 5 Special Occupancies | 520.68(A)(1) | Flexible conductors, including cable extensions, used to supply portable stage equipment shall be listed extra-hard usage cords or cables. [520.68(A)(1)](https://2023.antflix.net#520.68(A)(1)) | https://2023.antflix.net#520.68(A)(1) |
Chaptewr 5 Special Occupancies | 520.68(A)(2) | Listed, hard usage (junior hard service) cord or cable shall be permitted where all of the following conditions are met: The cord or cable is protected from physical damage by attachment over its entire length to a pipe, tower, truss, scaffold, or other substantial support structure, or installed in a location that inherently prevents physical damage to the cord.The cord or cable is connected to a branch circuit protected by an overcurrent protective device rated at not over 20 amperes.The cord or cable does not exceed 30 m (100 ft) in length. [520.68(A)(2)](https://2023.antflix.net#520.68(A)(2)) | https://2023.antflix.net#520.68(A)(2) |
Chaptewr 5 Special Occupancies | 520.68(A)(3) | Listed, hard usage cord shall be permitted to supply stand lamps where the cord is not subject to physical damage and is protected by an overcurrent device rated at not over 20 amperes. [520.68(A)(3)](https://2023.antflix.net#520.68(A)(3)) | https://2023.antflix.net#520.68(A)(3) |
Chaptewr 5 Special Occupancies | 520.68(A)(4) | Listed hard usage supply cords shall be permitted to supply luminaires if all of the following conditions are met: The supply cord is not longer than 2.0 m (6.6 ft).The supply cord is attached at one end to the luminaire or a luminaire-specific listed connector that mates with a panel-mounted inlet on the body of the luminaire.The supply cord is protected by an overcurrent protective device of not more than 20 amperes.The luminaire is listed.The supply cord is not subject to physical damage. [520.68(A)(4)](https://2023.antflix.net#520.68(A)(4)) | https://2023.antflix.net#520.68(A)(4) |
Chaptewr 5 Special Occupancies | 520.68(A)(5) | A special assembly of conductors in sleeving not longer than 1.0 m (3.3 ft) 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 0.635 mm (0.025 in.). 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 conductors as determined by a qualified testing laboratory and recognized test standards. [520.68(A)(5)](https://2023.antflix.net#520.68(A)(5)) | https://2023.antflix.net#520.68(A)(5) |
Chaptewr 5 Special Occupancies | 520.68(A)(6) | Listed, hard usage (junior hard service) cords shall be permitted in breakout assemblies where all of the following conditions are met: The cords are utilized to connect between a single multi-pole connector containing two or more branch circuits and multiple 2-pole, 3-wire connectors.The longest cord in the breakout assembly does not exceed 6.0 m (20 ft).The breakout assembly is protected from physical damage by attachment over its entire length to a pipe, truss, tower, scaffold, or other substantial support structure.All branch circuits feeding the breakout assembly are protected by overcurrent devices rated at not over 20 amperes. [520.68(A)(6)](https://2023.antflix.net#520.68(A)(6)) | https://2023.antflix.net#520.68(A)(6) |
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