Which article focuses on Nonmetallic-sheathed cable (NM)?

• A. Article 320: Armored Cable (AC) usage and installation.
• B. Article 334: Nonmetallic-sheathed cable (NM).
• C. Article 310: Conductors for general use: ampacity, insulation, and temperature ratings.
• D. Article 314: Boxes, enclosures, and fittings used in electrical installations.

Answer: (B)

The key idea is recognizing how NEC organizes rules by product type. Nonmetallic-sheathed cable, commonly called NM or Romex, has a dedicated article that covers its definition, where it can be used, installation requirements, and typical limitations. This article explains what NM is, the proper uses (usually dry, indoor residential spaces), and how it must be installed and protected. The other articles refer to different products: armored cable (AC) is in the article about Armored Cable, general conductors and their ampacity are in the article on Conductors for General Use, and boxes and fittings are in the article on Boxes, Enclosures, and Fittings. Therefore, the article focused on Nonmetallic-sheathed cable (NM) is the one with NM in its title.