Which NEC article covers optical fiber cables?

• A. Article 600
• B. Article 770
• C. Article 430
• D. Article 800

Answer: (B)

Optical fiber cables are handled in the NEC by a dedicated article that covers Optical Fiber Cables and Equipment. This article establishes the requirements for fiber optic cables, splices, connectors, and related hardware, including how they must be installed, supported, protected, and terminated, as well as considerations like separation from power conductors and environmental conditions. That focus on fiber optics is why it’s the best choice: it specifically addresses the installation and safety needs of fiber optic systems, rather than other types of communications wiring or machinery. The other articles deal with different systems—copper-based communications circuits, motor circuits, or other topics—so they don’t address optical fiber cables in the same direct way.