The purpose of the NEC is the practical safeguarding of persons and property from hazards arising from the use of electricity
People using electrical equipment that is in compliance with NEC requirements are generally safeguarded from electrical hazards that would result from contact because all live parts are guarded, insulated, or isolated from contact.
The NEC states that it is not intended to be used as a design manual or specification or an instruction manual for untrained persons , A good design will comply with the NEC in order to be safe.
The NEC covers the installation of conductors, equipment, and raceways for electrical systems, communications, and signaling systems.
The code is cover the installations in Public and private premises ( that include buildings and structures , mobile homes )
The NEC is not covered installations for Ships, railway rolling stock, aircraft, and automobiles and Communications equipment.
The NEC is divided into an introduction and nine chapters :
- The introduction consists of one article, Article 90.
- Chapters 1 through 4 cover the general installation requirements of the NEC .
- Chapters 5, 6, and 7 provide for more stringent, less stringent, or more specific requirements for the special occupancies
- Chapter 8 is not subject to the requirements of Chapters 1 through 7
- Chapter 9 consists of tables that are all applicable when they are referenced by other articles