Which chapter in the 2011 National Electrical Code is not subject to the requirements of the other chapters unless referenced specifically?

Chapter 8 of the National Electrical Code (NEC) covers communications systems, which include various low-voltage applications such as signaling and data communications. This chapter is unique because it sets forth its own requirements specific to low voltage and communication technologies, and it typically does not adhere to the general requirements outlined in the other chapters unless explicitly referenced.

The chapter is designed to address issues pertinent to these specialized systems, recognizing the differences in operation, safety, and installation practices compared to higher voltage electrical systems. As a result, while other chapters in the NEC provide foundational electrical safety and installation practices, Chapter 8 operates with a degree of independence, allowing for regulations tailored specifically to communication systems.