FPN: Rules that are followed by a reference in brackets contain text that has been extracted from NFPA 90A-2002, Standard for the Installation of Air- Conditioning and Ventilating Systems. Only editorial changes were made to the extracted text to make it consistent with this Code.
I. General
820.1 Scope. This article covers coaxial cable distribution of radio frequency signals typically employed in community antenna television (CATV) systems.
820.2 Definitions. See Article 100. For the purposes of this article, the following additional definitions apply.
Abandoned Coaxial Cable. Installed coaxial cable that is not terminated at equipment other than a coaxial connector and not identified for future use with a tag.
FPN: See Article 100 for a definition of Equipment.
Air Duct. A conduit or passageway for conveying air to or from heating, cooling, air conditioning, or ventilating equipment, but not including the plenum. [90A:3.3.5]
Coaxial Cable. A cylindrical assembly composed of a conductor centered inside a metallic tube or shield, separated by a dielectric material, and usually covered by an insulating jacket.
Exposed (to Accidental Contact). A circuit in such a po- sition that, in case of failure of supports and or insulation, contact with another circuit may result.
FPN: See Article 100 for two other definitions of Exposed.
Point of Entrance. The point within a building at which the coaxial cable emerges from an external wall, from a concrete floor slab, or from a rigid metal conduit (Type RMC) or an intermediate metal conduit (Type IMC) con- nected by a grounding conductor to an electrode in accordance with 820.100(B).
Premises. The land and buildings of a user located on the user side of utility-user network point of demarcation.
820.3 Other Articles. Circuits and equipment shall com- ply with 820.3(A) through (G).
(A) Hazardous (Classified) Locations. CATV equipment installed in a location that is classified in accordance with 500.5 shall comply with the applicable
requirements of Chapter 5.
(B) Ducts, Plenums, and Other Air-Handling Spaces. Section 300.22, where installed in ducts, plenums, or other spaces used for environmental air, shall apply.
Exception: As permitted in 820.154(A).
(C) Installation and Use. Section 110.3 shall apply.
(D) Installations of Conductive and Nonconductive
Optical Fiber Cables. Article 770 shall apply.
(E) Communications Circuits. Article 800 shall apply.
(F) Network-Powered Broadband Communications
Systems. Article 830 shall apply.
(G) Alternate Wiring Methods. The wiring methods of Article 830 shall be permitted to substitute for the wiring methods of Article 820.
FPN: Use of Article 830 wiring methods will facilitate the upgrading of Article 820 installations to network- powered broadband applications.
820.15 Power Limitations. Coaxial cable shall be permitted to deliver power to equipment that is directly associated with the radio frequency distribution system if the voltage is not over 60 volts and if the current is supplied by a transformer or other device that has power-limiting characteristics.
Power shall be blocked from premises devices on the network that are not intended to be powered via the coaxial cable.