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When using the NEC it is important to remember the
arrangement of the Code as found in Section 90-3 in the Introduction.
If these rules and the rules published by the International Association
of Electrical Inspectors are adhered to, many incorrect interpretations
can be avoided. Below is a list of the rules that everyone reading the
NEC should know.
- Chapters 1 through 4 apply generally except as modified or amended
by Chapters 5 through 7.
- Chapter 8 on communications systems (telephone, telegraph, radio
and television equipment, and community antenna systems) is a stand
alone chapter and is independent of the other chapters except where they
are specifically referenced in chapter 8.
- When a chapter is divided into parts, Part A - General applies to
all the other parts which are independent of each other.
- When sections are referenced always read the title to the section.
The section rules apply within the scope of the heading or subheading
only. Also, exceptions apply only to the subheading which they follow.
- Article 110, requirements for electrical installations applies to
all other articles of the code.
- Fine print notes, [FPN], are explanations and are not mandatory
rules.
- Mandatory rules are worded with "shall." Where the word "May" is
used the authority having jurisdiction may or may not grant permission.
Most electrical people will find the NEC much easier to read if they
will remember these rules.
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