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Significant Proposals for 2005 NEC Part XVI

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.


Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits

3-131
725.3 Other Articles.
(B) Spread of Fire or Products of Combustion. Text revised to clarify when the accessible portion of abandoned Class 2, Class 3, and PLTC cables is required to be removed.

3-133
725.3 Other Articles.
(C) Ducts, Plenums, and Other Air-Handling Spaces. Changes make it clear that plenum rated cables and raceways are not permitted in ducts or plenums [300.22(B)].

Author's Comment: This conflicts with 725.61(A), which permits plenum rated cables in ducts and plenums.

3-133
725.3 Other Articles.
(C) Ducts, Plenums, and Other Air-Handling Spaces. Changes in the second sentence clarify the types of cables permitted in "other space used for environmental air [300.22(C)]."

3-157
725.42 Circuit Marking.
This section was revised to clarify what equipment supplying the circuit must be durably marked to indicate each Class 2 or Class 3 circuit.

3-162a
725.56 Installation of Conductors of Different Circuits in the Same Cable, Enclosure, or Raceway.
(F) Class 2 or Class 3 Conductors or Cables and Audio System Circuits. New rule prohibits audio system circuits in the same cable or raceway with Class 2 or Class 3 conductors or cables.

Author's Comment: The logic is that a fault between audio amplifier circuits and these Class 2 and Class 3 circuits has the potential to create a hazard by disrupting system operation.

3-171
725.61 Applications of Listed Class 2, Class 3, and PLTC Cables.
(A) Plenum. New sentence makes it clear the type of nonmetallic raceways permitted to be installed in "other spaces used for environmental air."

3-171
725.61 Applications of Listed Class 2, Class 3, and PLTC Cables.
(B) Riser. New sentence makes it clear the type of nonmetallic raceways permitted to be installed in vertical riser runs.


Article 760 Fire Alarm Systems

I. General

3-131
760.3 Other Articles.
(A) Spread of Fire or Products of Combustion. Text revised to clarify when the accessible portion of abandoned fire alarm cables is required to be removed.

3-234
760.8 Mechanical Execution of Work.
New FPN provides an informational reference to a comprehensive standard on neat and workmanlike manner.

II. Non-Power-Limited Fire Alarm (NPLFA) Circuits

3-236
760.21 NPLFA Circuit Power Source Requirements.
New rule prohibits nonpower-limited fire alarm circuits (120V) from being supplied through arc-fault circuit-interrupters (AFCI).

III. Power-Limited Fire Alarm (PLFA) Circuits

3-256
760.41 Power Sources for PLFA Circuits.
New rule prohibits power-limited fire alarm circuits (120V) from being supplied through arc-fault circuit-interrupters (AFCI).

3-258
760.42 Circuit Marking.
This section was revised to clarify what equipment supplying the circuit must be durably marked to indicate each PLFA circuit.

Author's Comment: This section has been interpreted (2002 Edition), that raceway, fittings, as well as outlet boxes are required to be marked. As a matter of fact, manufacturers who sell raceways and fittings that are painted red, make such a claim.

3-260
760.52 Wiring Methods and Materials on Load Side of the PLFA Power Source.
Additional text clarifies when nonpower-limited wiring and power-limited cables can be installed in the same conduit.

Author's Comment" For instance, the initiating devices would be wired using the FPL cable and the notification appliances would be wired with THHN conductors.

3-264a
760.56 Installation of Conductors of Different PLFA Circuits, Class 2, Class 3, and Communications Circuits in the Same Cable, Enclosure, or Raceway.
(D) Audio System Circuits and PLFA Circuits. New rule prohibits audio system circuits in the same cable or raceway with power-limited conductors or cables.


Article 770 Optical Fiber Cables and Raceways

16-9
770.2 Definitions.
New definitions added:
Air Duct.
Air-Handling Unit Room Plenum.
Apparatus Casing Plenum.
Duct Distribution Plenum.

16-13
770.3 Other Articles.
(A) Spread of Fire or Products of Combustion.
Text revised to clarify when the accessible portion of optical fiber cables is required to be removed.

16-15
770.3 Other Articles.
(B) Ducts, Plenums, and Other Air-Handling Spaces. Changes in the second sentence clarify when plenum rated cables and raceways are permitted in ceiling cavity plenums and raised floor plenums.

Author's Comment: The definitions for ceiling cavity plenums and raised floor plenums were added to 770.2.

16-5
770.6 Raceways for Optical Fiber Cables.
(B) Listed Plenum Optical Fiber Raceway. Clarify when optical fiber cables can be installed in listed optical fiber raceways.

16-5
770.6 Raceways for Optical Fiber Cables.
(C) Listed Riser Optical Fiber Raceway. Clarify when listed optical fiber raceways can be installed in any Chapter 3 raceway.

16-5
770.6 Raceways for Optical Fiber Cables.
(D) Unlisted Innerduct. Clarify when unlisted plastic innerduct is required to terminated and be firestopped at the point of entrance to a building.

16-20
770.8 Mechanical Execution of Work.
Section revised to clarify when optical fiber cables must be secured in place in accordance with the requirements contained in 300.11.

16-20 and 16-82
770.8 Mechanical Execution of Work.
New FPN provides an informational reference to a comprehensive standard on neat and workmanlike manner.

16-30
770.50 Installation of Optical Fiber Cables.
Exception No. 1 adds restrictions on the installation of unlisted cables in air handling spaces where they could contribute to fire and smoke hazard.


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