National Electrical Code articles and explanations - FREE

Home | Search | About us  

NEC Articles | Quizzes | Questions Answered, $115/hour                Bookmark and Share

nec training

National Electrical Code Articles and Information

NEC Quiz: Article 90 Answers

by Mark Lamendola

Back to Quiz

1.      [90.1(A)]. In a word, safety. The NEC provides for the practical safeguarding of persons and property from hazards arising from the use of electricity.

2.      [90.1(B)]. This question misses the point of the NEC, which provides minimum standards for safety. The NEC is not a design guide, though it is a safety standard. With rare exceptions, the NEC does not address issues of convenience, efficiency, or adequacy for good service or future expansion. Failing to meet NEC requirements can carry serious criminal and/or civil consequences both to firms and to individuals.

3.      [90.1(C)]. No. The NEC is not an instruction manual for the untrained. The NEC makes no attempt to serve as a recipe book for those who don't have extensive electrical training. The NEC assumes the user already has this training. Consequently, people without this training have difficulty understanding much of what the NEC is even talking about.

4.      [90.2(A)(2)]. Yes. Parking lot lighting and other systems fall under the auspices of the NEC.

5.      [90.2(B)(1)]. No. Ships do not fall under the NEC. Shipboard systems are entirely different from land-based systems.

6.      [90.3]. The first four chapters apply generally—that is, they address all installations. Not all of the material in each of these chapters will apply to each installation. But something in each chapter will.

7.      [90.5 (A) and(B]).

Permissive rules identify actions that are allowed but not required. Mandatory rules identify actions that are specifically required or prohibited.

8.      [90.5(C)]. FPNs include such things as references to other standards, suggestions, and "FYI" material. FPNs do not contain Code requirements. The voltage drop information in [210.19(a) FPN No. 4 is an example of information many people falsely believe is a Code requirement.

9.      [90.7] If a product is Listed, you can install it without having it examined for approval for the applciation. This is a huge saver of time and money.

10. [90.9]. It uses both, depending on the trade practices and industry standards for a particular application.