Significant Proposals for
2005 NEC Part XI
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 the Code panel will change many 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 3 [ 4.5MB ].
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 5 Special Occupancies
Article 500 Hazardous (Classified) Locations
Electrical and Electronic Equipment. Sentence added to the FPN to alert the Code user
to a standard that provides information and guidance on the use of portable electronic
products in hazardous locations.
Article 501 Class I Locations
Scope added to this article, and many of the section were renumbered and rearranged to
provide for ease of use by standardization of numbering and arrangement within the article.
14-8 and 14-27
501.10 Wiring Methods.
(B) Class I, Division 2.
(3) Rigid nonmetallic conduit. New text gives the conditions when rigid nonmetallic conduit
is permitted in a Class I, Division 2 location.
Author's Comment: Rigid nonmetallic conduit provides
a conduit system that is corrosion resistant and safe where needed in chemical plants,
refineries, off shore drilling facilities, and other similar processes, which are highly
corrosive and also have classified areas.
501.15 Sealing and Drainage.
(B) Conduit Seals, Class I, Division 2.
(2) Class I, Division 2 Boundary. Text revisions clarify when the raceway boundary seal
can consist of duct seal, non-deteriorating chalking and other approved methods that will
limit gases or vapors from transferring out of the area.
Author's Comment: Seals in conduits passing from Division 2 locations into
unclassified locations are needed to prevent the passage of gases or vapors, not to contain
explosions in the conduit system.
Article 511 Commercial Garages, Repair and Storage
511.3 Classifications of Locations.
This section was reorganized so that text related to unclassified locations within commercial
garages is now located in 511.3(A) and text related to classified locations is now located
511.4 Wiring and Equipment in Class I Locations.
Text that indicated the space within a slab or masonry wall or below the slab was a Class
I Location if any connections or extensions lead into or through such areas was deleted.
Author's Comment: With the changes to 501.10(B)(3),
501.15(B)(2), and this section, Rigid Nonmetallic Conduit is now an acceptable wiring
method to supply circuits underground in a commercial garage area.
Article 513 Aircraft Hangars
513.12 Ground-Fault Circuit-Interrupter Protection for Personnel.
New section clarifies when GFCI protection is required for 15A and 20A, 125V, receptacles
used for diagnostic equipment, electrical hand tools, or portable lighting equipment.
Author's Comment: Personnel servicing and maintaining
aircraft use the same hand tools and equipment that are used in commercial garages (which
requires GFCI protection) and they should be afforded the same level of personnel protection.
Article 514 Motor Fuel Dispensing Facilities
The scope of this article was revised to clarify the type of motor fuel facilities it
Author's Comment: Article 514 now applies to marine/motor
fuel dispensing facilities, motor fuel dispensing facilities located inside buildings,
and fleet vehicle motor fuel dispensing facilities.
514.3 Classification of Locations.
(B) Classified Locations.
(1) Class I Locations. Note added to Table 514.3 to clarify the area where the restrictions
apply for fuel dispensing facilities on a floating dock.
514.8 Underground Wiring.
Text deleted to clarify that the space below a Class I, Division 1 or 2 locations is no
longer considered a Class I, Division 1 location. However, the raceways sealing requirements
for raceways under a Class 1, Division 1 or 2 locations did not change.
Article 517 Health Care Facilities
517.13 Grounding of Receptacles and Fixed Electric Equipment in Patient Care Areas. (A)
Wiring Methods. Clarify that 250.118 governs which metal wiring method qualifies as an
equipment grounding return path.
517.13 Grounding of Receptacles and Fixed Electric Equipment in Patient Care Areas. (B)
Insulated Equipment Grounding Conductor. Clarify the grounding (bonding) requirements
for receptacles and non-current carrying conductive surfaces of electric equipment supplied
by a listed cable having a metallic armor or sheath assembly.
517.16 Receptacles with Insulated Grounding Terminals.
Revisions to the FPN is intended to help designers, installers and inspection authorities
better understand the limitations on the use of receptacles with insulated grounding terminals
(isolated ground receptacles) in patient care area.
Caution: The use of insulated ground type receptacles
(isolated ground receptacles) does not satisfy the parallel bond path required by 517.13
for receptacles in patient-care areas.
517.18 General Care Areas.
(C) Pediatric Locations. Additional text expands the required use of tamper resistant
receptacles or tamper resistant covers in pediatric facilities.
Author's Comment: Electrons do not know what part
of the pediatric area they are in and pose a shock hazard when touched by young children.
517.18 General Care Areas.
(D) Psychiatric Locations. New paragraph expands the areas where tamper resistant receptacles
or tamper resistant covers are required if accessible to psychiatric patients.
517.30 Essential Electrical Systems for Hospitals.
(C) Wiring Requirements.
(3) Mechanical Protection of the Emergency System. This section was revised to allow Type
AC and MC cables for emergency circuits (instead of a nonflexible metal raceway), but
only under specific conditions.
Author's Comment: The metal sheath of Type AC and
MC cable is considered to provide adequate mechanical protection for this application.