NEC Article 820 outlines the requirements for the installation and maintenance of community antenna television (CATV) and radio distribution systems. This article ensures that these systems are installed safely and effectively. Here is a comprehensive overview of the key sections within this article:

820.1 Scope

This section covers the installation of coaxial cable distribution systems for television and radio signals, including CATV, satellite TV, and radio systems.

820.2 Definitions

Defines essential terms related to CATV and radio distribution systems to ensure clarity and consistency in application. Key terms include “community antenna television (CATV) system” and “coaxial cable.”

820.25 Abandoned Cables

Specifies that accessible portions of abandoned coaxial cables must be removed unless they are tagged for future use. The tags must be durable and suitable for the environment where they are located.

820.44 Overhead (Aerial) Coaxial Cables

• 820.44(A) On Poles and In-Span: Provides conditions for supporting coaxial cables on the same poles as electric power conductors, ensuring proper clearances and attachments.
• 820.44(B) Above Roofs: Requires a vertical clearance of at least 8 feet above roofs for coaxial cables, with exceptions for auxiliary buildings and certain roof slopes.

820.47 Underground Coaxial Cables Entering Buildings

• 820.47(A) Underground Systems with Electric Light, Power, Class 1, or Non-Power-Limited Fire Alarm Circuit Conductors: Mandates separation between coaxial cables and power conductors by brick, concrete, or tile partitions.
• 820.47(B) Underground Block Distribution: Ensures that coaxial cables running underground within a block are kept clear of power circuits over 300 volts.

820.53 Lightning Conductors

Recommends maintaining a separation of at least 6 feet between coaxial cables and lightning conductors where practicable, to prevent potential hazards from lightning strikes.

820.90 Protective Devices

• 820.90(A) Primary Protectors: Requires listed primary protectors for circuits exposed to aerial or underground electric light or power conductors operating at over 300 volts. Protectors are also required for interbuilding circuits exposed to lightning.
• 820.90(B) Application: Ensures that each circuit subject to potential exposure to high voltages is protected to prevent damage and ensure safety.

820.100 Grounding

Outlines grounding requirements for metallic members of coaxial cable systems to minimize the risk of electrical shock. This includes connection to a grounding electrode system.

820.133 Installation of Coaxial Cables and Equipment

Specifies installation practices for coaxial cables, including guidelines for protection against physical damage and interference from other systems.

820.154 Access to Electrical Equipment

Ensures that coaxial cable systems are installed in a manner that does not obstruct access to other electrical equipment, promoting safety and facilitating maintenance.

820.182 Mechanical Execution of Work

Requires that the installation of coaxial cable systems be performed in a workmanlike manner, including properly securing and supporting cables and avoiding damage to other building systems.

For more detailed information and specific requirements, consulting the NEC Handbook and additional resources provided by the NFPA is highly recommended. Further insights can be found on resources like Electrical Contractor Magazine and The NEC Wiki.