Which chapter of the NEC covers general requirements for all electrical installations?

Chapter 1 of the National Electrical Code (NEC) establishes the general requirements for all electrical installations. This chapter lays the groundwork for the subsequent chapters by defining the purpose, scope, and organization of the code. It includes essential provisions such as the purpose of the NEC, applicability, and wiring methods that apply across various installations. By providing fundamental regulations applicable to all types of electrical work—residential, commercial, and industrial—Chapter 1 ensures that all electrical systems are installed safely and efficiently, consistent with national safety standards. This foundational nature is what makes it essential to understanding the comprehensive guidelines set forth in the NEC.

Other chapters, while they may cover specific applications or systems, do not provide the overarching requirements that apply universally to all electrical installations like Chapter 1 does.