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Chapter 3 of the National Electrical Code (NEC) primarily addresses wiring methods. This chapter provides the rules and requirements for various wiring techniques and materials used in electrical installations. It covers aspects such as raceways, cable assemblies, conductors, and other elements essential for ensuring safe and effective electrical systems. Understanding Chapter 3 is crucial for electricians, as it lays the groundwork for how electrical wiring should be conducted in different environments and scenarios.

The options that focus on grounding, electrical installations in general, and fixture wiring are all important aspects of electrical work, but they pertain to different chapters in the NEC. Grounding is primarily discussed in Chapter 2, while broader electrical installations are covered in various other sections. Fixture wiring, while part of the overall installation process, is not the central focus of Chapter 3.