Which article provides guidance for the installation of armored cable?

• A. Article 334: Nonmetallic-sheathed cable (NM).
• B. Article 314: Boxes, enclosures, and fittings used in electrical installations.
• C. Article 410: Luminaires and lighting equipment.
• D. Article 320: Armored Cable (AC) usage and installation.

Answer: (D)

The main concept here is where to find the specific guidance for installing armored cable. Armored cable, a flexible metal-clad conductor often called AC or BX, has its own set of installation rules that address how the cable must be supported, protected, terminated, and connected. The article dedicated to Armored Cable usage and installation provides those exact requirements, including acceptable fittings, termination methods, and where the cable can be run. It distinguishes armor cable from other conductors and materials, such as NM cable, which have their own installation rules found in a different article, or from general boxes and fittings or luminaires, which cover different aspects of electrical installations. Because the guidance for installing armored cable is contained in the article specifically about Armored Cable, that is the best and most direct source for this topic.