Which article would cover the electrical requirements for theaters and similar locations?

The correct answer is C, Article 520, which specifically addresses the electrical requirements for theaters and similar locations. This article outlines the unique electrical needs and conditions that must be met in environments where performances take place, such as stages or auditoriums, and incorporates considerations for safety, lighting, and equipment used in live performances.

Article 520 includes regulations that govern the use of wiring methods, installation practices, and circuit requirements tailored to accommodate the complexities of theater setups. This includes provisions for stage equipment, such as lighting and sound systems, as well as emergency systems to ensure the safety of performers and audiences alike.

In contrast, the other articles mentioned focus on different aspects of electrical installations. Article 530 pertains to the electrical requirements for motion picture and television studios, while Article 540 deals with the power distribution and wiring systems for amusement rides and attractions. Article 525 covers the requirements for carnival and circus installations. Each of these articles has a specific focus that does not encompass the broader range of needs found in theatrical settings, making Article 520 the most suitable choice for this question.