Which article pertains to equipment used for transmitting radio signals?

Article 810 of the National Electrical Code (NEC) specifically addresses the installation requirements for equipment used for radio signal transmission. This article covers various aspects including the installation of antennas, transmission lines, and related equipment, ensuring that they are set up safely and in compliance with electrical standards.

The focus of Article 810 is to establish guidelines that minimize hazards associated with electrical installations in radio equipment, such as ensuring proper grounding and protection against lightning strikes. This is particularly important given the unique environments and potential electrical hazards present in radio signal transmission applications.

In contrast, other articles mentioned do focus on different aspects of electrical infrastructure. For example, Article 820 pertains to community antenna television (CATV) systems which involve a different set of requirements and equipment. Article 830 is concerned with residential and commercial communication systems while Article 840 deals with low-voltage communication circuits. Each of these articles addresses specific technologies but does not cover the transmission of radio signals as comprehensively as Article 810 does.