NEC Article 800 outlines the requirements for communications systems, covering installation, operation, and maintenance. This article ensures that various communication technologies are installed safely and effectively. Here is a detailed overview of the key sections within this article:

800.1 Scope

This section covers the general requirements for communications systems, applying to communications circuits and systems unless modified by other specific articles.

800.2 Definitions

Defines key terms used in the article to ensure clarity. Important terms include “abandoned cable,” “communications service provider,” and “point of entrance.”

800.25 Abandoned Cables

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

800.44 Overhead (Aerial) Communications Wires and Cables

• 800.44(A) On Poles and In-Span: Specifies conditions for supporting communications wires and cables on the same poles as electric power conductors, including relative location, attachment to cross-arms, climbing space, and clearance.
• 800.44(B) Above Roofs: Communications wires and cables must maintain a vertical clearance of at least 8 feet from all points of roofs they pass above, with exceptions for auxiliary buildings and certain roof slopes.

800.47 Underground Communications Wires and Cables Entering Buildings

• 800.47(A) Underground Systems with Electric Light, Power, Class 1, or Non-Power-Limited Fire Alarm Circuit Conductors: Requires separation between communications wires and power conductors by brick, concrete, or tile partitions.
• 800.47(B) Underground Block Distribution: When running underground within a block, communications circuits must be free from the likelihood of contact with power circuits over 300 volts.

800.53 Lightning Conductors

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

800.90 Protective Devices

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

800.100 Grounding

Outlines the grounding requirements for metallic members of communications systems. Ensures that all metallic parts are properly grounded to minimize the risk of electrical shock.

800.133 Installation of Communications Wires, Cables, and Equipment

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

800.154 Access to Electrical Equipment

Ensures that communications systems are installed in a manner that does not obstruct access to other electrical equipment. This promotes safety and facilitates maintenance.

800.182 Mechanical Execution of Work

Requires that the installation of communications systems be performed in a workmanlike manner. This includes securing and supporting cables properly 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 The NEC Wiki and Electrical License Renewal.