What NEC article covers the rules for receptacle and switch boxes in walls?

• A. Article 314
• B. Article 404
• C. Article 230
• D. Article 250

Answer: (A)

In the NEC, the rules for receptacle and switch boxes in walls are found in the article that covers Conduit, Fittings, Boxes, and Covers. This section lays out the requirements for the boxes themselves—where they can be placed, how deep they must be set, and the volume needed (box fill) to safely contain conductors and devices like receptacles and switches. It also covers the types of boxes allowed for wall installations and how they must be mounted and covered.

This is the best answer because it directly governs the enclosures used for mounting those devices, rather than the devices themselves or other electrical topics. The other articles address different areas: switches in general, service equipment, or grounding and bonding, none of which specify the box-related rules for wall-mounted receptacles and switches.