Electrician's Licensing Practice Exam

Article 392 specifically addresses cable tray installations in the National Electrical Code (NEC). This article provides guidelines and requirements for the safe and effective installation of cable trays, which are used to support insulated electrical cables in a wide variety of applications. It covers aspects such as materials, installation methods, spacing, and securing of cable trays, ensuring that personnel adhere to safety standards and that the installations operate effectively within their intended environments.

Other articles mentioned do cover important topics in electrical installations, but they do not focus specifically on cable tray systems. Article 300 deals with general wiring methods and requirements, Article 250 focuses on grounding and bonding, and Article 400 addresses flexible cords and cables. These topics are critical for electrical safety and functionality, but Article 392 is uniquely specialized for cable tray installations, making it the correct answer in this context.