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Significant Proposals for 2005 NEC Part XVII

As Reviewed by Mike Holt

The following text is a quick summary of the proposed changes for the 2005 NEC. This document is a work in progress and many will be changed by the Code panel over the next few months. Some of these you might find important to your work and you might want to follow their progress with me. Therefore, each week I will email you a few of these changes.

Each proposed change has a Report on Proposal (ROP) number, like 1-25. This number reflects the Proposal Number and all action on this proposal can be viewed in the following PDF document NEC Part 4.

As always, I am looking to improve our products, so if you feel you have anything to contribute, please let me know at Mike@MikeHolt.com.


Chapter 8 Communications Systems

Article 800 Communications Circuits


16-9
800.2 Definition
New definitions added:
Air Duct.
Air-Handling Unit Room Plenum.
Apparatus Casing Plenum.
Ceiling Cavity Plenum.
Duct Distribution Plenum.
Raised Floor Plenum.

16-75
800.3 Other Articles.
(C) Spread of Fire or Products of Combustion. Text revised to clarify when the accessible portion of abandoned communications cables is required to be removed.

16-81
800.8 Mechanical Execution of Work.
Section revised to clarify when communications cables must be secured in place in accordance with the requirements contained in 300.11.

Author's Comment: This requirement is not contained in Articles 725 or 810.

16-81 and 16-82
800.8 Mechanical Execution of Work.
New FPN provides an informational reference to a comprehensive standard on neat and workmanlike manner.

16-96
800.40 Cable and Primary Protector Grounding.
(A) Grounding Conductor.
(4) Length. New FPN alerts the Code user that limiting the primary protector grounding conductor helps reduce voltages that may be developed between the building's power and communications systems during lightning events.

16-107
800.50 Installation of Communications Wires and Cables.
Exception adds restrictions on the installation of unlisted communications cables in air handling spaces where they could contribute to fire and smoke hazard.


Article 810 Radio and Television Equipment

16-153
810.21 Antenna Discharge Units - Receiving Stations.
(K) Electrode Connection. New subsection clarifies what fitting is suitable for the termination of the grounding conductor, from the discharge unit, to the grounding electrode.

Article 820 Community Antenna Television and Radio Distribution Systems

16-9
820.2 Definitions
New definitions added:
Air Duct.
Air-Handling Unit Room Plenum.
Apparatus Casing Plenum.
Ceiling Cavity Plenum.
Duct Distribution Plenum.
Raised Floor Plenum.

16-13
820.3 Other Articles.
(A) Spread of Fire or Products of Combustion. Text revised to clarify when the accessible portion of abandoned coaxial cables must be removed.

16-15
820.3 Other Articles.
(B) Ducts, Plenums, and Other Air-Handling Spaces. Text added to specify what coaxial cables can be installed in ceiling cavity plenums and raised floor plenums.

Author's Comment: Note: The definitions for ceiling cavity plenums and raised floor plenums were added to 810.2.

16-160
820.8 Mechanical Execution of Work.
Section revised to clarify when coaxial cables must be secured in place in accordance with the requirements contained in 300.11.

16-160
820.8 Mechanical Execution of Work.
New FPN provides an informational reference to a comprehensive standard on neat and workmanlike manner.

16-163
820.40 Cable Grounding.
(A) Grounding Conductor.
(4) Length. New FPN alerts the Code user that limiting the grounding conductor helps reduce voltages that may be developed between the building's power and communications systems during lightning events.

16-165
820.48 Raceways for Coaxial Cables.
New section contains the installation requirements for coaxial cables in raceways.

16-170
820.50
Exception adds that restrictions on the installation of unlisted coaxial cables in air handling spaces where they could contribute to fire and smoke hazard.


Article 830 Network-Powered Broadband Communications Systems

16-13
830.3 Other Articles.
(A) Spread of Fire or Products of Combustion. Text revised to clarify when the accessible portion of abandoned network-powered broadband communications cables is required to be removed.

16-15 and 16-227
830.3 Other Articles.
(B) Ducts, Plenums, and Other Air-Handling Spaces. Text added to specify which network-powered broadband communications cables can be installed in ceiling cavity plenums and raised floor plenums.

16-216
830.8 Mechanical Execution of Work.
This section now requires network-powered broadband communications cables to be secured in place in accordance with 300.11.

16-216
830.8 Mechanical Execution of Work.
New FPN provides an informational reference to a comprehensive standard on neat and workmanlike manner.

16-96
830.40 Cable, Network Interface Unit, and Primary Protector Grounding.
(A) Grounding Conductor.
(4) Length. New FPN alerts the Code user that limiting the length of the grounding conductor for the network interface units containing protectors, primary protectors, and the metallic members of the network-powered broadband communications cable helps reducing voltages that may be developed between the building's power and communications systems during lightning events.

16-97a
830.40 Cable, Network Interface Unit, and Primary Protector Grounding.
(C) Electrode Connection. New subsection clarifies what fitting is suitable for the termination of the grounding conductor for the network interface units containing protectors, primary protectors, and the metallic members of the network-powered broadband communication cable, to the grounding electrode.

Annex E

7-212a
Annex E
This new table gives the maximum number of stories permitted for construction Types III, IV and V. In addition, text explains the general characteristics of the five construction Types.


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