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Significant Proposals for 2005 NEC Part VII

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 Part2.

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.

3- 67
300.11 Securing and Supporting.
(A) Secured in Place.
(1) Fire-Rated Assemblies. Wording added to clarify that wires added for the support of electrical equipment and wiring can be attached to the ceiling grid.

3-69
300.11 Securing and Supporting.
(C) Cables Not Used as Means of Support. New exception permits Class 2 cables to be supported by Type AC or MC cable, but only under specific conditions.

3-72
300.13 Mechanical and Electrical Continuity - Conductors.
(B) Device Removal. The panel rejected a proposal that would have required "pigtailling" all grounded (neutral) conductors on all circuits.

3-77
300.15 Boxes, Conduit Bodies, or Fittings-Where Required.
(L) Manholes and Handholes. "Handholes" are added to the list of installations not requiring a box for splices.

Author's Comment: Handholes are often used in conjunction with underground PVC conduit for the installation of landscape lighting, light poles, and other applications.

3-81
300.18 Raceway Installations.
(A) Complete Runs. New exception clarifies when raceways are not required to be complete before the installation of circuit conductors.


Article 310 Conductors for General Wiring

6-13
310.8 Locations.
(D) Locations Exposed to Direct Sunlight.
(3) Tape or Sleeving. Text revised to expand the method of protecting conductors and cables from exposed to the sun.

6-33
310.15 Ampacities for Conductors Rated 0-2000 Volts.
(B) Tables.
(2) Adjustment Factors.
(a) More Than Three Current-Carrying Conductors in a Raceway or Cable. Text added to clarify how each current-carrying conductor of a parallel conductor set is to be treated when applying the ampacity adjustment factors of Table 310.15(B)(2)(a).

6-30
310.15 Ampacities for Conductors Rated 0-2000 Volts.
(B) Tables.
(2) Adjustment Factors.
(a) More Than Three Current-Carrying Conductors in a Raceway or Cable. New FPN points the user to other Code sections that are exceptions to the rule on conductor ampacity adjustment for more than three current-carrying conductors in a raceway.

6-45
310.15 Ampacities for Conductors Rated 0-2000 Volts.
(B) Tables.
(2) Adjustment Factors.
(c) Installations Outdoors in Direct Sunlight. New rule requires conductors in raceways outdoors on rooftops that are exposed to direct sunlight to have the ampacity adjustment based on the outdoor ambient temperature, plus 30°F.

6-37, 6-41
310.15 Ampacities for Conductors Rated 0-2000 Volts.
(B) Tables.
(6) 120/240V, 3-Wire, Single-Phase Dwelling Services and Feeders. Additional text clarifies that Table 310.15(B)(6) only applies for individual dwelling units of one family, two-family and multifamily dwellings.

Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures

9-5
312.2 Damp, Wet, or Hazardous (Classified) Locations.
(A) Damp and Wet Locations. New text requires an absolute watertight connection (termination fitting shall be listed for wet locations) in areas where the wiring would lead water directly into live parts.

Author's Comment: This would include a Meyer's hub or sealing locknut.

9-14
312.4 Repairing Plaster and Drywall or Plasterboard.
New rule added to clarify the sealing of gaps or open spaces around cabinets or cutout boxes.

Author's Comment: This provides the same requirement in regard to workmanship around panelboards, as is required around outlet boxes [314.21].


Article 314 Outlet, Device, Pull, and Junction Boxes; Conduit Bodies; Fittings

9-23
314.15 Damp, Wet, or Hazardous (Classified) Locations.
(A) Damp or Wet Locations. New exception clarifies that "listing for wet location" is not required for a handhole enclosure that is installed in a wet location.

9-43
314.20 In Wall or Ceiling.
Revised text clarifies what many of us have taken for granted, but could have been disputed, about plaster rings, domed covers, extension rings, or listed extenders set back from non-combustible finish surfaces.

9-43
314.20 In Wall or Ceiling.
Additional text clarifies the set back requirements for plaster rings, domed covers, extension rings, or listed extender, as well as boxes from combustible surfaces.

9-50
314.23 Supports.
(B) Structural Mounting.
(1) Nails and Screws. New text permits screws to continue to be used to support boxes, but only if they comply with the new requirements.

9-68a
314.30 Handhole Enclosures.
New section contains handhole enclosures requirements, such as sizing, wiring entries, and covers.


Article 320 Armored Cable: Type AC

7-15
320.17 Through or Parallel to Framing Members.
Section revised to clarify that bushings are not required when for Type AC cables pass through opening in metal studs.

7-19
320.30 Securing and Supporting.
(B) Unsupported Cables.
(3) 6 ft Support Rule. Text clarifies the requirements for the "6 ft whip without support rule" for luminaire or other electrical equipment within an accessible ceiling rule.

7-22
320.80 Ampacity.
(A) Thermal Insulation. Changes clarify that the 90°C conductor insulation ampacity (as listed in Table 310.16) can be used for conductor ampacity adjustment, but only under limited conditions.

Author's Comment: This brings the ampacity adjustment requirements for Type AC cable into consistency with Type NM cable [334.80].


Article 330 Metal-Clad Cable: Type MC

7-65
330.17 Through or Parallel to Framing Members.
Section revised to clarify that bushings are not required when for Type MC cables pass through opening in metal studs.

330.30 Securing and Supporting.
(B) Unsupported Cables.
(3) 6 ft Support Rule. Text clarifies the requirements for the "6 ft whip without support rule" for luminaire or other electrical equipment within an accessible ceiling rule.


Article 334 Nonmetallic-Sheathed Cable: Types NM, NMC, and NMS

7-144
334.30 Securing and Supporting.
New paragraph clarifies that cables protected from physical damage by a raceway shall not be required to be secured within the raceway.

Author's Comment: Kinda like a no brainer to me, but some inspectors would not allow the sleeving NM cables in a raceway, because the cable could not be secured within 12 in. of the outlet box.

7-150a
334.80 Ampacity.
A new paragraph requires conductors to have their ampacity adjusted, when more than one NM cable is bundled together as they pass through some fire- or draft-stopped barriers.


Article 342 Intermediate Metal Conduit: Type IMC

8-9, 8-9
342.22 Number of Conductors.
Revised text permits cables to be installed within IMC.

8-16
342.30 Securing and Supporting.
(B) Supports. Text added to make the distinction between "support" and "securely fastened".

Author's Comment: A raceway that is supported may still be subject to movement, where being "securely fastened" should eliminate or extremely limit the amount of possible movement.


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