Television Studios. Equipment used in motion picture and television studios shall comply with Article 530.
(I) Swimming Pools, Fountains, and Similar Locations. Audio equipment used in or near swimming pools, fountains, and similar locations shall comply with Article 680.
(J) Combination Systems. Where the authority having jurisdiction permits audio systems for paging or music, or both, to be combined with fire alarm systems, the wiring shall comply with Article 760.
FPN: For installation requirements for such combination systems, refer to NFPA 72®-2007, National Fire Alarm Code®, and NFPA 70/®-2OO6, Life Safety Code®.
(K) Antennas. Equipment used in audio systems that contain an audio or video tuner and an antenna input shall comply with Article 810. Wiring other than antenna wiring that connects such equipment to other audio equipment shall comply with this article.
(L) Generators. Generators shall be installed in accor- dance with 445.10 through 445.12, 445.14 through
445.16, and 445.18. Grounding of portable and vehicle- mounted generators shall be in accordance with
250.34.
640.4 Protection of Electrical Equipment. Amplifiers, loudspeakers, and other equipment shall be so located or protected as to guard against environmental exposure or physical damage, such as might result in fire, shock, or personal hazard.
640.5 Access to Electrical Equipment Behind Panels Designed to Allow Access. Access to equipment shall not be denied by an accumulation of wires and cables that prevents removal of panels, including suspended ceiling panels.
640.6 Mechanical Execution of Work.
(A) Neat and Workmanlike Manner. Audio signal pro- cessing, amplification, and reproduction equipment, cables, and circuits shall be installed in a neat workmanlike manner.
(B) Installation of Audio Distribution Cables. Cables in- stalled exposed on the surface of ceilings and sidewalls
shall be supported in such a manner that the audio distribution cables will not be damaged by normal building use. Such cables shall be secured by straps, staples, cable ties, hangers, or similar fittings designed and installed so as not to damage the cable. The installation shall conform to 300.4 and 300.11(A).
(C) Abandoned Audio Distribution Cables. The acces- sible portion of abandoned audio distribution cables shall be removed.
(D) Installed Audio Distribution Cable Identified for
Future Use.
(1) Cables identified for future use shall be marked with a tag of sufficient durability to withstand the environment involved.
(2) Cable tags shall have the following information:
(1) Date cable was identified for future use
(2) Date of intended use
(3) Information related to the intended future use of cable
640.7 Grounding.
(A) General. Wireways and auxiliary gutters shall be connected to an equipment grounding conductor(s), to an equipment bonding jumper, or to the grounded conductor where permitted or required by 250.92(B)(1) or 250.142. Where the wireway or auxiliary gutter does not contain power-supply wires, the equipment grounding conductor shall not be required to be larger than 14 AWG copper or its equivalent. Where the wireway or auxiliary gutter contains power-supply wires, the equipment grounding conductor shall not be smaller than specified in 250.122.
(B) Separately Derived Systems with 60 Volts to
Ground. Grounding of separately derived systems with
60 volts to ground shall