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NEC 2011 Handbook Section 90
Section 90 Review
15
Electrical Engineering
Undergraduate 2
01/13/2011

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Term
What is covered by the NEC Article 90.2(A)?
Definition
Installation of electrical conductors, equipment, raceways in:
- Public and Private Premises
- Yards, Parking Lots, Carnivals
- Industrial Substation Conductors & Equipment that Conducts Electricity
- Electric utility facilities, Offices, Shops
- and recreational buildings that are not part of a generating plant.
Term
What is #1 that is NOT covered by the NEC Article 90.2(B)?
Definition
Installations:
1. in ships, watercraft, and other floating buildings.
Term
What is #2 NOT covered by the NEC Article 90.2(B)?
Definition
2. underground in mines and self-propelled mobile mining machinery
Term
What is #3 NOT covered by the NEC Article 90.2(B)?
Definition
3. and installations of railway for generation, transformation, transmission or distribution of power used exclusively for signaling and communications purposes.
Term
What is #4 that is NOT covered by the NEC Article 90.2(B)?
Definition
4. Installations of communication equipment under the exclusive control of communications utilities located outdoors or in a building used for such installations.m
Term
What is #5 NOT covered by the NEC Article 90.2(B)?
Definition
5. Installations under the exclusive control of a utility where such installations;
- Consists of service drops or laterals and associated metering,
- Are located in legally established easements and right of ways,
- Are on property owned by electric utility for the purpose of metering, generation, control, distribution of electrical energy.
Term
Article 90.4 - Enforcement, how is the NEC enforced?
Definition
It could be city, state, township, county, or municipality of the electrical installation.
Term
Who is responsible for interpreting the rules and may give special permission for installations when appropriate while maintaining effective safety?
Definition
Authority Having Jurisdictions (AHJ) This could again be city, state, township, county or municipality.
Term
Article 90.5(A) ='s?
Definition
Mandatory Rules
Term
Article 90.5(B) ='s?
Definition
Permissive Rules
Term
Article 90.5(C) ='s?
Definition
Explanatory Rules
Term
Article 90.5(A), what is meant by "mandatory rules"?
Definition
actions that are specifically required or prohibited and are characterized by the use of the terms "shall" or "shall not".
Term
Article 90.5(B), what is meant by "permissive rules"?
Definition
actions that are allowed but not required, are normally used to describe options or alternative methods, and are characterized by the use of the terms "shall be permitted" or "shall not be required".
Term
Article 90.5(C), what is meant by "explanatory rules"?
Definition
Informative material, such as:
- references to other standards,
- references to related sections of the Code,
- or information related to a Code rule.
Term
What are the 6 features of the Handbook, listed in the front cover?
Definition
1. The code text is in black.
2. Shaded areas are added commentary.
3. Exhibits add information in picture format.
4. New sections are indicated by a vertical line.
5. Changes are highlighted by tan shading.
6. Bullets indicate sections removed.
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