A data network that uses structured cabling and data transmission services is covered by which NEC article?

• A. Article 380
• B. Article 410
• C. Article 510
• D. Article 800

Answer: (D)

Structured cabling and data transmission services are treated as a communications system in the NEC. The code groups electrical work by function, and data networks used for voice, data, and video fall under the Communications Systems article. That article provides the requirements for installing and protecting the cables, raceways, and terminations that carry data and communications signals, as well as how these low‑voltage circuits should be routed and separated from power circuits. Because a data network relies on dedicated communications cabling rather than power distribution or lighting circuits, it fits best under this article. The other articles in the list cover different electrical functions (such as power and lighting), not data communications.