DOCUMENT STRUCTURE AND of the NEC.
The National Electrical Code shall be organized as 90 contains the scope of the NEC and administrative are major subdivisions of the NEC that cover broad areas and are divided into articles.
Chapters shall be organized as follows:
General Article 100 Definitions Article 110 Requirements for Electrical Installations
Wiring and Protection Articles 200 299
Articles 300 399
Equipment for General Use Articles 400 499
Special Occupancies Articles 500 599
Special Equipment Articles 600 699
Special Conditions Articles 700 799
Communications Systems Articles 800 899
Chapter are chapter subdivisions that cover a specific subject such as grounding, overcurrent protection, lighting fixtures, and so on.
Each article shall have a title.
Articles are divided into sections and sometimes into an article is sufficiently large, it shall be permitted to be subdivided into parts that correspond to logical groupings of information.
Parts shall have titles and shall be designated by Roman numerals.
Parts typically consist of a number of sections; see 18.104.22.168 for section numbering in articles that are subdivided into Specifications
Sections shall be permitted to be subdivided for clarity, with each subdivision representing either a rule or a part of a rule.
Up to three levels of subdivisions shall be permitted, and any level shall be permitted to contain a list.
Lists are a method of structuring the items necessary to complete a rule.
Lists in any subdivision level shall be numbered, and listed items shall be single words, phrases, or sentences.
Items in a list shall not contain Titles.
First and second level subdivisions shall have titles.
Third level subdivisions shall be permitted to have Example.
The following illustrates typical subdivision numbering with lists (see also
Wiring and Protection
Article 250 Grounding
Part and Size of Equipment otherwise required in this Code, equipment
grounding conductors shall be permitted to be bare, covered, or
Level 1 of Conductors.An insulated or covered conductor larger than No.6 copper or aluminum shall be permitted to be identified, at the time of installation, by one of the following means:
List item (1)
Stripping the insulation or covering from the entire exposed
Coloring the exposed insulation or covering green.List item
Marking the exposed insulation or covering with green tape or green
Size of Conductors.
General.Copper, aluminum, or copper-clad aluminum equipment
grounding conductors of the wire type shall not be smaller than shown in
Adjustment for Voltage Drop.
If conductors are adjusted to
compensate for voltage drop, equipment grounding conductors shall be
adjusted according to circular mil area.
Conductors in Parallel.If conductors are run in parallel, the
equipment grounding conductors shall be sized by either of the
Each parallel equipment grounding conductor shall be sized on the
basis of the ampere rating of the overcurrent protective protection for equipment is installed, each parallel equipment
grounding conductor run in a raceway shall be to be sized in accordance with
Parallel equipment grounding conductors in multiconductor cables
shall be permitted to be sized in accordance with the Table 250.122
on the basis of the trip rating of the ground-fault protection if the
following conditions are met:
Only qualified persons will service the installation.List item
The trip rating is not greater than the ampacity of a single conductor.
The ground-fault protection is listed for the (previously known as appendixes) shall contain references, examples, calculations, tables, and similar nonmandatory material.
Annexes do not form part of the requirements of the National Electrical Code, and a statement to that effect shall appear at the beginning of each annex.
Annexes shall have titles and shall be designated by capital C
Conduit and Tubing Fill for Conductors and Fixture Wires of the Same Size
This annex is not a part of the requirements of this
Code but is included for informational purposes only.
Annexes that are used to cross-reference material from one edition of the Code to another edition of the Code shall remain as an annex for a minimum of two code cycles.
NFPA staff shall have the responsibility of updating any cross-reference annex.
Content of NEC article shall have a scope, which shall be the first section of the article.
The approval of article scope statements is the responsibility of the Technical Correlating Appliances
422.1 Scope Article
280 Surge Arresters
280.1 shall be in alphabetical order and shall not contain the term that is being defined.
Definitions shall not contain requirements or recommendation