Electrician's Licensing Practice Exam

What type of installations does Article 392 of the NEC focus on?

1. Service drops

2. Cable trays

3. Fixture wiring

4. Grounding conductors

The correct answer is: Cable trays

Article 392 of the National Electrical Code (NEC) specifically addresses cable tray installations, which are used for supporting multiple cables. Cable trays serve as a structural support system for wiring and offer an organized approach to managing electrical systems, especially in commercial and industrial settings. This article outlines the requirements for the installation, derating of conductors, and the proper support and grounding of tray assemblies, ensuring safety and compliance with electrical standards. Service drops, fixture wiring, and grounding conductors, while important aspects of electrical work, fall within other articles of the NEC. Service drops pertain to overhead conductors delivering power to buildings, fixture wiring deals with the installation of electrical fixtures and their connections, and grounding conductors focus on ensuring safe electrical grounding systems. Understanding that Article 392 is focused specifically on the guidelines and regulations for cable trays allows electricians to ensure proper installation and exploration of cable management options in their projects.