What does Article 390 refer to in the context of electrical installations?

Article 390 specifically addresses the installation and use of underfloor raceways in the context of electrical installations. Underfloor raceways provide a pathway for electrical conductors and cables, allowing for organized distribution of electrical power and communication wiring in commercial and industrial settings. This article outlines the requirements for the construction, installation, and use of such raceways, ensuring they meet safety and functional standards.

The importance of this article lies in its emphasis on proper installation methods, materials, and related safety considerations, which are critical to maintaining compliance with electrical codes and ensuring safe operational conditions in buildings that utilize these systems. Understanding the regulations in Article 390 is crucial for electricians, especially when designing and implementing underfloor solutions that facilitate effective electrical distribution.

In contrast, the other options relate to different aspects of electrical installations that are governed by separate articles in the electrical code. Each has its unique set of requirements and considerations that do not overlap with the focus of Article 390.