What is regulated under Article 620?

The correct answer is B, which states that Article 620 regulates elevators, dumbwaiters, escalators, and moving walks. This article is part of the National Electrical Code (NEC) and specifically addresses the electrical requirements and safety standards needed for these types of conveyances. Ensuring the proper installation and maintenance of elevators and similar systems is crucial, as they involve significant electrical components and safety implications for users.

Article 620 includes guidelines regarding wiring methods, equipment, and specific safety requirements that are essential for the reliable operation of these systems. For example, it outlines standards for power supply, control circuits, emergency operations, and maintenance procedures, all of which are vital to ensuring the safe and smooth operation of elevators and related conveyances in residential and commercial buildings.

Understanding this regulation is important for electricians, as it ensures compliance with safety standards and minimizes risks associated with electrical failures in systems that transport people or goods vertically. This reflects the broader goal of the NEC, which aims to provide safe electrical installations and protect both the public and workers in the electrical industry.