What section of the NEC addresses residential and commercial wiring standards?

The correct choice specifies the range of articles that cover the standards for residential and commercial wiring. Articles 320 through 400 in the National Electrical Code (NEC) address various types of wiring and installation practices used commonly in both residential and commercial settings. This includes a wide variety of conductors, such as nonmetallic-sheathed cable (Romex), underground cable, and other installation types relevant to both home and business environments.

For instance, Article 320 deals with the requirements for nonmetallic-sheathed cable, which is frequently used in residential buildings, while Article 400 addresses flexible cords and cables, which may be used in both residential and commercial applications. Furthermore, these articles establish safety protocols, material specifications, and installation guidelines that are essential to ensure electrical systems are safe and effective in various settings.

The other choices reference sections that are more specialized or not focused specifically on the general residential and commercial wiring standards, which is why they do not apply in broad contexts where general electrical installations are concerned.