Electrician's Licensing Practice Exam

NEC Chapters 1-4 govern basic practices in hazardous areas except as modified by which specific chapter?

1. Chapter 5

2. Chapter 3

3. Chapter 10

4. Chapter 7

The correct answer is: Chapter 5

Chapter 5 of the National Electrical Code (NEC) specifically addresses the requirements for hazardous locations, such as those containing flammable gases, vapors, or combustible dust. While Chapters 1-4 cover general practices, installations, and specific requirements applicable to most electrical systems, Chapter 5 introduces additional guidelines that take precedence in hazardous areas, modifying the general rules to enhance safety. This chapter delineates specific classifications and types of hazardous locations, including Class I, Class II, and Class III areas, each with unique installation practices. It details the types of equipment that are permitted, the level of protection required, and the installation methods necessary to minimize the risk of explosions or fires in these sensitive environments. The other chapters mentioned focus on varied topics unrelated to the specific safety measures required in hazardous areas. For instance, Chapter 3 covers general wiring methods, while Chapter 7 pertains to special conditions, and Chapter 10 addresses the use of specific materials. Therefore, these chapters do not modify the basic practices for hazardous areas as explicitly as Chapter 5 does.