Under the NEC, what is a key feature of systems discussed in Article 820?

The focus of Article 820 in the National Electrical Code (NEC) is primarily on the distribution of television signals. This article provides guidelines and requirements for the installation of cable television equipment and other systems that use coaxial cables and similar means to distribute television signals.

This encompasses various components, including the cable plant, grounding requirements, and safety practices to ensure the effective and safe transmission of signals. By establishing standards specific to signal distribution, the NEC ensures that systems are not only functional but also safe for installation and use.

Other options, while important in their own right, do not reflect the primary concern and features highlighted within Article 820. Accessibility for the disabled is typically addressed in other sections of the NEC that focus on general safety and accessibility standards. Video transmission quality, while related, is more about the technical specifications and performance of the technology rather than the electrical code requirements. Power source regulations are covered under different articles that govern electrical installations more generally, rather than focusing specifically on television signal distribution.