Which article focuses on Armored Cable (AC) usage and installation?

• A. Article 334: Nonmetallic-sheathed cable (NM).
• B. Article 400: Flexible cords and cables.
• C. Article 320: Armored Cable (AC) usage and installation.
• D. Article 314: Boxes, enclosures, and fittings used in electrical installations.

Answer: (C)

Armored Cable has its own article because the metal armor adds specific installation and protection requirements that are different from other wiring methods. The article dedicated to Armored Cable (AC) covers how AC is used, how it must be installed, and the conditions under which it can be run, including how to secure it, what fittings and connectors keep the armor continuous, how splices are handled (typically inside boxes), and grounding considerations related to the armor.

This approach makes sense since other wiring methods have their own articles: nonmetallic-sheathed cable (NM) has a separate set of rules, flexible cords and cables are addressed separately, and boxes, enclosures, and fittings have their own article. So the focus on Armored Cable usage and installation belongs to the article specifically for AC.