Which article focuses on systems for distributing power in ceilings?

The correct choice is associated with Article 393, which specifically deals with the requirements and specifications for systems designed to distribute power in ceilings. This article outlines the appropriate methods and materials that should be used to ensure the safety and effectiveness of electrical distribution systems installed in ceiling spaces.

Understanding the regulations and guidelines set forth in Article 393 is crucial for electricians when planning and installing electrical systems in commercial and residential buildings, as it addresses critical factors such as load capacity, protection of conductors, and accessibility for maintenance. This ensures compliance with safety standards and enhances the overall reliability of the electrical distribution system within ceiling installations.

The other articles mentioned focus on different aspects of electrical systems, such as power and control circuit conductors or other distribution methods, which do not specifically address the unique applications and requirements for ceiling power distribution systems like Article 393 does.