Thursday, December 30, 2010

Significant Changes in the 2011 NEC Part I Continued

Part I Continued:

Chapter 1, Article 100, "Definitions:"

Definition Changed:


Essentially the same type of wording change as is seen with the definition of "automatic," where the wording has been simplified to "requiring human intervention..."

Informational Note Changed:

"Non-linear Load"

Electronic and inductive ballasts and LED drivers have been added to the list of common types of non-linear loads. This is an important distinction as non-linear loads are one of the 4 rules for allowing the counting of "current carrying conductors" for the purposes of correctly sizing conductors for ampacity.

Re-labeled and Moved Definition:

"Overcurrent Protective Device, Branch-Circuit"

Changed from "Branch-Circuit Overcurrent Device." No wording within the actual definition was changed. It now corresponds with the common acronym "OCPD."

Re-labeled and Moved Definition:

"Overcurrent Protective Device, Supplementary"

Changed from "Supplementary Overcurrent Protective Device," and moved. No wording was changed within the definition itself.

Definition Added:

"Service Conductors, Overhead"

Definition added to describe the actual conductors within the "Service-Entrance Conductors, Overhead System" definition. Specifies the portion of conductors from the service point and to the "first point of connection to the service entrance conductors at the building etc... sic..."

Definition Added:

"Service Conductors, Underground"

Definition added to describe the actual conductors within the "Service-Entrance Conductors, Underground System" definition, (ROP 4-206).

Definition Changed:

"Service Drop"

Wording has been simplified from "from the last pole or other aerial the building," to a more broad and encompassing description: "The overhead conductors between the utility distribution system and the service point."

Definition Changed:

"Service Lateral"

Wording simplified to "The underground conductors between the utility distribution system and the service point." A lot of the previous definition's wording was moved into the new definitions of "Service Conductors, Underground" .

Informational Note Added:

"Service Point"

Adds a simplified description of "where the serving utility ends and the premises wiring begins."

Definition Added:

"Uninterruptible Power Supply"

Defines UPS's as a backup emergency power supply and also systems that may offer voltage regulation as well. A UPS may be a single unit type piece of equipment or be the sum of various pieces of a whole systems.



"Article 110.10"

In this article, the title was amended to include "short-circuit current ratings." The word "equipment" was added in front of "grounding conductor" to more accurately reflect the change to the term EGC and its associated definition. A reference to Article 250.118 was added.

"Article 110.14(A)"

Added a note instructing the manufacturers to identify terminals for the use of "fine stranded" conductors and cable terminations. A new table in Chapter 9; Table 10, has been added to correspond with Class B and Class C stranded conductors.

"Article 110.16"

Title is changed to "Arc-Flash Hazard Warning." Also the word "units" was substituted for "occupancies," to more closely correlate with the term "dwelling units" and its associated definition. It should be noted that this article only addresses a requirement for Hazard "labeling" but does not specify requirements for the attenuation or mitigation OF flash protection. Those types of requirements are provide by the NFPA 70E the "Standard for Electrical Safety in the Workplace."

"Article 90.5(C)"

Article Has Changed:

All FPN's (formerly known as Fine Print Notes) have now been relabeled and changed to "Informational Notes." All FPN references in the entire Code have now been deleted and replaced with this new labeling.}

Final installment of Part 1

"Article 110.24 (A) and (B) and Exception, "


This article has been added to address an new requirement for field marking of Service Equipment. This article now requires a durable label with that contains the available fault current and the installation date, to be provided in addition to the manufacturer's labeling as is required in 110.16 "Arc-Flash Hazard Warning," 110.21 "Marking," and other code sections. This label shall also be modified if and when changes are made to the service equipment. The exception allows for the exclusion of equipment in industrial applications and where conditions ensure that only qualified persons service the equipment. This entire article and section helps to maintain compliance and knowledge of the proper AIC interrupting ratings of the equipment as is required in 110.9 "Interrupting Rating."

"Article 110.26(A)(3)"

Article is Changed:

The 2008 NEC simply referenced "Article 110.26(E)'s" requirements for working height. The new wording improves the clarity and intent of both articles. Moving the 2008's reference also places ALL electrical equipment under the so called "6 1/2 foot" rule. The "headroom" reference was deleted to eliminate the confusion of what it consisted of or to what equipment it should have been applied. This eliminated section (E) and 2008's section (F) was changed to the 2011's section (E).

Exception No. 1:

Was amended to eliminate the "headroom" wording and replaced with: "the height of the working space."

Exception No. 2: ADDED

This exception covers utility meters and trans-socket (meter can) enclosures. It allows for the glass meter itself to extend past the 6" limitation specified in 110.26(A)(3) . However, the socket enclosure itself must follow all working space rules in 110.26(D) .

"Article 110.26(D) "Illumination"

Article is Changed:

Former wording in this article section required that the illumination in electrical equipment rooms, NOT be controlled by automatic means ONLY. New wording eliminated "electrical equipment rooms" and placed the automatic lighting control restriction in the upper part of the paragraph. This now serves to increase the scope of the rule to include many more equipment areas and spaces.

"Article 110.28 "Enclosure Types"

Article is Changed and Moved

Previously numbers as Article 110.20 along with its corresponding table, labeled Table 110.20 "Enclosure Selection," they are now 110.28 and Table 110.28 respectively.

The new wording adds eleven additional types of equipment to the previous list of items included under the rules of this article. In essence this now requires most all types of enclosures to have their type (enclosure number, such as a "3R" etc....) marked on them.

"Article 110.31(A)" "Electrical Vaults"

Article is Changed:

This article has been drastically expanded and now includes 5 separate sub-sections that did not previously exist. 2008's 110.31(A) was labeled "Fire Resistance of Electrical Vaults." The new sections include further rules on such as "Doors," "Locks," and other items. Two new Informational Notes were added to clarify and reference fire rating standards and levels.

"Article 100.74" "Conductor Installation"

Article is Changed:

Applicable to manhole installations, this article has, for the most part, the same wording. It has been broken out and numbered into separate paragraphs to facilitate easier understanding of the section.



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