What kind of rooms does Article 540 focus on?

Article 540 specifically addresses the requirements for motion picture projection rooms. This section of the electrical code outlines the unique conditions and safety considerations necessary for these specialized environments, which differ significantly from general electrical installations.

Motion picture projection rooms host equipment that generates substantial light and heat, such as projectors and sound systems. To ensure safety and compliance, regulations in Article 540 cover aspects such as wiring methods, equipment installation, and space layout to protect both the equipment and individuals working in or around these rooms. This is crucial because improper installation can lead to hazards like electrical fires or equipment failures.

The other options, while related to entertainment and media production, do not fall under the specific purview of Article 540. Editing suites, audio production rooms, and general office areas have different electrical requirements and safety standards, making them not applicable to the regulations set forth in this article. Thus, the focus on motion picture projection rooms by Article 540 is clear and justifies the correct answer.