The National Electrical Code (NEC), also known as NFPA 70, is a comprehensive set of electrical safety standards that apply to the installation and maintenance of electrical systems in the United States. It is published by the National Fire Protection Association (NFPA) and is updated every three years.

The NEC covers a wide range of topics related to electrical safety, including wiring methods, conductor sizes, protective devices, grounding, and more. It is used as the basis for electrical codes and standards in many states and localities in the United States, and it is often referenced by building codes, insurance companies, and other organizations.

The NEC is a "model" code, which means that it is intended to be adopted and modified by states, localities, or other organizations. As a result, the NEC is not itself a law, but rather a set of guidelines that must be adopted and enforced by a regulatory authority in order to be legally binding.

How many codes are in the NEC?

The National Electrical Code (NEC) is a comprehensive set of electrical safety standards that is updated every three years. The NEC consists of a series of articles, sections, and tables that cover a wide range of topics related to electrical safety.

The NEC is divided into several chapters, each of which covers a specific topic. The chapters are as follows:

+ General
+ Wiring and Protection
+ Wiring Methods and Materials
+ Equipment for General Use
+ Special Occupancies
+ Special Equipment
+ Special Conditions
+ Communications Systems

In addition to these chapters, the NEC also includes Annexes, which contain non-mandatory information that is provided for guidance or reference. The Annexes are not considered part of the code, but they may be useful in understanding the requirements of the NEC.

The number of codes in the NEC varies from edition to edition, as the NEC is updated every three years to reflect changes in technology and best practices. The current edition of the NEC, NEC 2021, consists of over 800 pages of text and illustrations.