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Automatic overcurrent protective devices (circuit breakers or fuses) for motion picture studio stage set lighting and the stage cables for such stage set lighting shall be as given in (a) through (e) below.
NOTE: Special consideration is given to motion picture studios and similar locations because filming periods are of short duration.
(a) Stage Cables. Stage cables for stage set lighting shall be protected by means of overcurrent devices.
(b) Feeders. In buildings used primarily for motion picture production, the feeders from the substations to the stages shall be protected by means of overcurrent devices (generally located in the substation) having suitable ampere rating. The overcurrent devices shall be permitted to be multipole or single-pole gang-operated. No pole or overcurrent device shall be required in the neutral conductor. The overcurrent device setting for each feeder shall not exceed 400 percent of the ampacity of the feeder.
(c) Location Boards. Overcurrent protection (fuses or circuit breakers) shall be provided at the "location boards." Fuses in the "location boards" shall have an ampere rating of not over 400 percent of the ampacity of the cables between the "location boards" and the plugging boxes.
(d) Plugging Boxes. Where plugging boxes are not provided with overcurrent devices, each cable or cord smaller than No. 8 supplied through a plugging box shall be attached to the plugging box by means of a plug containing two cartridge fuses or a circuit breaker. The rating of the fuses or the setting of the circuit breaker shall not be over 400 percent of the safe ampacity of the cables or cords.
(e) Lighting. Work lights, stand lamps, and fixtures shall be connected to plugging boxes by means of plugs containing two cartridge fuses not larger than 20 amperes, or they shall be permitted to be connected to special outlets on circuits protected by fuses or circuit breakers rated at not over 0 amperes. Plug fuses shall not be used unless they are on the load side of the fuse or circuit breakers on the "location boards."
(Title 24, Part 3, Section 530-18.)
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
1. Editorial correction filed 11-2-83 (Register 83, No. 45).
2. Amendment of subsection (e) filed 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).