Re: Put 334.15(C) back the way you found it.
7-131 Log #1827 NEC-P07
(334-15(A) Exception (New) )
Final Action: Reject
Submitter: David Zinck, NewburyPort Wiring Inspector
Recommendation:
Add an exception to read as follows:
Exception: Stacker devices designed for the purpose shall be allowed to secure the cable where installed in accordance with (a) and (b)
below:
(a) the stacker devices are installed at intervals no greater than 600 mm (2 ft) and,
(b) the wire enters the stacker device from the top or the side.
Substantiation:
Stacker devices provide a very handy, safe, and neat way to do home runs in a house. With the cable supported at a maximum of 2 ft the spport is equivalent to runing through holes in studs. The purpose of (b) is to ensure that the wire snaps down into the device. If the devices were installed with the openings to the bottom, not much cable would have to fall out before the weight of the cable would pull the wire out of the others. Also, there is at least one manufacturer that has a device that the wires snap into on both sides. On such a device only the top half could be used on horizontal runs.
Panel Meeting Action: Reject
Panel Statement:
334.30 does not prohibit using this type of device.
Number Eligible to Vote: 15
Affirmative: 14 Negative: 1 Ballot Results:
Explanation of Negative:
BROWN: The panel statement concerning 334.30 indicated that the use of "stacker devices" are not prohibited by the NEC. This proposal would recognize and regulate their use in an installation and should be considered.
7-132 Log #1239 NEC-P07
(334-15(B))
Final Action: Accept
Submitter: David H. Kendall, Carlon, Lamson & Sessions
Recommendation:
Revise text to read as follows:
(B) Protection from Physical Damage. The cable shall be protected from physical damage where necessary by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC rigid nonmetallic conduit, pipe, guard strips, listed surface metal or nonmetallic raceway, or other approved means. Where passing through a floor, the cable shall be enclosed in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC rigid nonmetallic conduit, listed surface metal or
nonmetallic raceway, or other metal pipe or other approved means extending at least 150 mm (6 in.) above the floor.
Substantiation:
Pipe, guard strips, listed surface metal or nonmetallic raceways are not listed for areas of physical damage and should not be referenced. These raceways and methods will not provide the physical strength required to protect the NM cable in an area that has been determined as an area of physical damage.
Panel Meeting Action: Accept
Number Eligible to Vote: 15
Affirmative: 15 Ballot Results:
7-133 Log #1805 NEC-P07
(334-15(B))
Final Action: Reject
Submitter: William A. Wolfe, Steel Tube Institute of North America
Recommendation:
Revise to read:
Where subject to physical damage tThe cable shall be protected from physical damage where necessary by...
Substantiation:
This text is consistent with that used throughout the NEC for wiring methods that may be subject to physical damage. It makes it clear
that physical protection is always to be provided where the cable is subject to physical damage.
Panel Meeting Action: Reject
Panel Statement:
The action on Proposal 7-132 explains how the cable must be protected where subject to physical damage.
Number Eligible to Vote: 15
Affirmative: 15 Ballot Results:
831
Report on Proposals ? May 2004 NFPA 70
7-134 Log #2037 NEC-P07
(334-15(B))
Final Action: Accept
Submitter: National Electrical Code Technical Correlating Committee
Recommendation:
This suggested change would move the text from 334.10(B)(3) to a new sentence at the end of 334.15(B) as
follows:
(B) Protection from Physical Damage. The cable shall be protected from physical damage where necessary by conduit, electrical metallic tubing, Schedule 80 PVC rigid nonmetallic conduit, pipe, guard strips, listed surface metal or nonmetallic raceway, or other means. Where passing through a floor, the cable shall be
enclosed in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC rigid nonmetallic conduit, listed surface metal or nonmetallic raceway, or other metal pipe extending at least 150 mm (6 in.) above the floor.
Where Type NMC cable is installed in shallow chases in masonry, concrete, or adobe, the cable shall be protected against nails or screws by a steel plate at least 1.59 mm (1/16 in.) thick and covered with plaster, adobe, or similar finish.
Substantiation:
This information was previously located under "uses permitted" and should more appropriately be inserted within Section 334.15(B) since this section is dealing with protection from physical damage. During the processing of the 2002 NEC, a code-making panel identified concerns with the concept of trying to describe the "uses permitted" for a particular wiring method and not be in conflict with the "uses not permitted". In some cases, the permitted and "not permitted" uses can be easily segregated. However, there are a number of instances where the "use permitted" ends up being the exception to a "use not permitted".
Because of the problems becoming apparent with the lists, the Correlating Committee asked the Usability Task Group to review the issue and make a recommendation on how to best handle the lists.
With these revisions, the NEC language would only cover those specific "uses not permitted" for a wiring method. All applications not covered by those limitations would be acceptable.
This is a companion proposal to revise 334.12 to include the Uses Permitted Language.
This would make it easier for inspectors, manufacturers, electricians, and others in the electrical industry to determine what uses were not permitted for this wiring method without making it necessary for the Code Panels to provide a running laundry list of uses permitted. The Useability Task Group on Uses Permitted/Uses Not Permitted is comprised of Mr. George Dauberger,
Mr. John Minick, Mr. Jim Dollard, Mr. Dick Owen, Mr. Phil Sutherland, and Mr. Mark Ode.
Panel Meeting Action: Accept
Number Eligible to Vote: 15
Affirmative: 15 Ballot Results:
7-135 Log #1240 NEC-P07
(334-15(C))
Final Action: Reject
Submitter: David H. Kendall, Carlon, Lamson & Sessions
Recommendation:
Revise text to read as follows:
(C) In Unfinished Basements. Where the cable is run at angles with joists in unfinished basements, it shall be permissible to secure cables not smaller than two 6 AWG or three 8 AWG conductors directly to the lower edges of the joists. Smaller cables shall be run either through bored holes in joists or on running boards. NM cable used on a wall of a unfinished basement shall be installed in a listed conduit or tubing. Conduit or tubings shall utilize a nonmetallic bushing or adapter at the point where the cable enters the raceway. Metal conduit and tubings and metal outlet boxes shall be grounded.
Substantiation:
This proposal is to clarify that NM cable used in an unfinished basement must be installed into a raceway when coming down a wall to a device box. The nonmetallic bushing or adapter for the raceways is required to prevent possible damage to the sheathing on the cable. All metal components are required to be grounded.
Panel Meeting Action: Reject
Panel Statement:
334.15(A) and (B) address the submitter's concerns.
Number Eligible to Vote: 15
Affirmative: 15 Ballot Results:
832
This is a little lengthy but you ask for it. As you can see there was a little action before it made it to the comment stage but it is clear to see what was being attempted here.
If you use a metal raceway to protect NM cable on a basement wall then a metal box will be required and they must be bonded. See, 314.3 Nonmetallic Boxes, Exception 1 and 2.
The nonmetallic fitting was introduced because the pipe should be as high as the joist and this causes damage to the NM cable if no fitting is installed.
Again I hope this helps.
[ April 25, 2005, 02:30 PM: Message edited by: jwelectric ]
