2005 NEC ® Code Changes. Presenter Mark Nowak North East Specification and Project Manager. HOSTS. This document was compiled through the efforts of the Technical Liaison Department of Thomas & Betts, and is the property of Thomas & Betts.
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2005 NEC® Changes
The phrase “Listed for the purpose” has been removed from the NEC and replaced with “Listed as ____”. This provides users more guidance on the proper application of Listed products. Annex A of the NEC includes a list of Product Safety Standards for reference. An example would be products listed as “grounding and bonding equipment” as opposed to “listed for the purpose”.
An insulated grounded conductor larger than 6 AWG shall be identified by one of the following means:
(1) A continuous white or gray outer finish
(2) By three continuous white stripes along its entire length on other than green insulation
(3) At the time of installation, by a distinctive white or gray marking at its terminations. This marking shall encircle the conductor or insulation.
See illustration on the following page.Article 200 Use and Identification of Grounded Conductors
Section 210.8 (B)(4) (New) Outdoors in public spaces
Section 210.8 (B)(5) (New) HVAC convenience receptacles for other than dwellings
Section 210.8 (C) (New) Boat HoistsArticle 210 Branch Circuits
A new exception and diagrams have been added to clarify how separate wall countertop spaces are determined and to clarify where outlets are and are not required.
See illustrations on the following pages.Article 210 Branch Circuits
Countertop; Island Counter Spaces
New text has been added to clarify how separate countertop spaces are determined on island countertops. “Where a range top or sink is installed in an island counter, and the width of the counter behind the range top or sink is less than 300 mm (12 in.), the range top or sink is considered to divide the island into two separate countertop spaces as defined in 210.52(C)(4).”
See the following illustration.Article 210 Branch Circuits
Conductors, other than service-entrance conductors, shall be permitted to be installed in a cable tray with service entrance conductors provided a solid fixed barrier of a material compatible with the cable tray is installed to separate the service entrance conductors from the other conductors installed in the cable tray.Article 230 Services
changed from “Grounding” to “Grounding and Bonding”. This
article has always included the rules for bonding. There are
differences in these two terms and this is an effort to emphasize
the distinct differences.
Bonded- The permanent joining of metallic parts to form an
electrically conductive path that ensures electrical continuity and
the capacity to conduct safely any current likely to be imposed.
Grounded - Connected to earth or some conducting body that
serves in place of the earth.Article 250 Grounding and Bonding
Sheet metal screws shall not be used to connect grounding
conductors or connection devices
to enclosures.Article 250 Grounding and Bonding
The section was completely rewritten.
250.30 (A)(4)(c) Connections. All tap connections to the
common grounding electrode conductor shall be made at an
accessible location by one of the following methods:
1) a listed connector
2) listed connections to aluminum or copper busbars not less
than 6 mm x 50 mm (b in. x 2 in.). Where aluminum busbars are used, the installation shall comply with 250.64(A).
3) by the exothermic welding processArticle 250 Grounding and Bonding
The term “if available” was replaced with “are present” to describe
the existing grounding electrodes that must be bonded together. In addition, an exception was added for concrete encased
electrodes at existing buildings or structures. These electrodes do
not have to be bonded where the re-enforcing bars or rods are not accessible for use without disturbing the concrete.
Exception: Concrete-encased electrodes of existing buildings or
structures shall not be required to be part of the grounding
electrode system where the steel reinforcing bars or rods are not
accessible for use without disturbing the concrete.Article 250 Grounding and Bonding
Section 406.9(B)(4) and Figure Grounding-
The Grounding Symbol was changed to a fine print note.Article 250 Grounding and BondingArticle 406 Receptacles, Cord Connectors and Attachment Plugs (Caps)
At least one of the insulating washers shall be removed from receptacles that do not have a contact yoke or device that complies with 250.146(B) to ensure metal to metal contact.Article 250 Grounding and Bonding
Several changes have been made to the section
covering “Protection Against Physical Damage”.
1. Installations where cables are run parallel
to furring strips are required to utilize
2. Protection for cables can be supplied by
a steel plate less than 1/16 inch thick as
long as it provides equal or better protection.
3. Cables run in notches must comply with the protection requirement.Article 300 Wiring Methods
Add the following exception: “Short sections of raceways used to contain conductors or cable assemblies for protection from physical damage shall not be required to be installed complete between outlet, junction, or splicing points.”Article 300 Wiring Methods
Section 300.22(B) Wiring in Ducts Plenums, and other Air-Handling Spaces; Ducts or Plenums Used for Environment Air
The term “Liquidtight Flexible Metal Conduit” was removed from the list of approved wiring methods permitted to be used in ducts or plenums specifically used to transport environmental air.
The following sentence will be added to the end of the section.
“For enclosures in wet locations, raceways or cables entering above the level of uninsulated live parts shall use fittings listed for wet locations.”Article 300 Wiring Methods
A new second sentence was added to the section and reads as follows: A looped, unbroken conductor not less than twice the minimum length required for free conductors in 300.14 shall be counted twice.Article 314 Outlet, Device, Pull and Junction Boxes: Conduit Bodies; Fittings; and Handhole Enclosures
Section 314.20 In Wall or Ceiling
This section was revised to add plaster rings, domed covers,
extension rings and listed extenders to the installation
requirements relative to the surface of the wall or ceiling.Article 314 Outlet, Device, Pull and Junction Boxes: Conduit Bodies; Fittings; and Handhole Enclosures
This change adds the following sentence to the end of the requirement, “Screws shall not be permitted to pass through the box unless exposed threads in the box are protected using approved means to avoid abrasion of conductor insulation.”Article 314 Outlet, Device, Pull and Junction Boxes: Conduit Bodies; Fittings; and Handhole Enclosures
Section 344.30(B)(3) Securing and Supporting; Supports
The phrase “firmly supported” did not adequately secure the raceway, so the term was changed to “securely fastened” so the section reads, “Exposed vertical risers from industrial machinery or fixed equipment shall be permitted to be supported at intervals not exceeding 6 m (20 ft.), if the conduit is made up with threaded couplings, the conduit is securely fastened at the top and bottom of the riser, and no other means of intermediate support is readily available.Articles 342(IMC) and 344(RMC)
The Section was revised as follows:
“356.42 Connectors and Couplings. Only fittings listed for use with LFNC shall be used. Angle connectors shall not be used for concealed raceway installations.”Article 356 - Liquidtight Flexible Nonmetallic Conduit
This change revises the means for
identifying data and power
compartments in surface nonmetallic
raceway. Previously, the compartments had to be marked with sharply contrasting colors. This change permits stamping, imprinting or color-coding as a means of identification.Articles 386, 388 Surface Raceways
Cables, Rated 2000 Volts or
Less, in Cable Trays; Single-Conductor
Cables; Exception (New)
The exception was added to
392.11(B)(3) so it reads:
“(3) Where single conductors are
installed in a single layer in uncovered cable trays, with a maintained space of not less than one cable diameter between individual conductors, the ampacity of 1/0 AWG and larger cables shall not exceed the allowable ampacities in Tables 310.17 and 310.19.
Exception: For solid bottom cable trays the ampacity of single
conductor cables shall be determined by 310.15(C).Article 392 Cable Tray
This Section was revised by deleting “outdoor” to read as follows: 15 and 20 ampere, 125 and 250 volt receptacles installed in a wet location shall have an enclosure that is weatherproof whether or not the plug cap is inserted.Article 406 Receptacles, Cord Connectors and Attachment Plugs (Caps)
This second sentence of the exception was revised to read as follows: The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed.Article 430 - Motors, Motor Circuits, and Controllers
The title of the article was changed from “Places of Assembly” to
“Assembly Occupancies”. College and university classrooms,
drinking establishments, passenger stations and terminals of air,
surface, underground, and marine public transportation facilities
have all been removed from the list of locations where electrical
nonmetallic tubing and rigid nonmetallic conduit may be used in
spaces with finish rating.Article 518 Assembly Occupancies