The NEC is divided into an introduction and nine chapters.
Chapter 1: General includes :
- definitions of terms used throughout the Code
- the general conditions that apply to all installations.
Chapter 2 : Wiring and Protection covers the general requirements for :
- branch circuits
- load calculations
- overcurrent protection
- grounding and bonding of equipment and systems.
Chapter 3 : Wiring Methods and Materials covers
- wiring methods
- the methods for installing conductors
- the conductors
Chapter4 : Equipment for General Use covers equipment
- flexible cords
- panelboards and switchboards
- air conditioning and heating equipment
- phase converters
Chapter5 :Special Occupancies
- installations in hospitals
- the significant restrictions on wiring methods for use in hazardous.
- mobile homes.
- recreational vehicle parks
Chapter 6: Special Equipment provides special rules
- swimming pools
- computer rooms
- X-ray equipment
- industrial machinery
- fire pumps
- solar photovoltaic systems.
Chapter7 : Special Conditions Covers :
- emergency and other types of standby systems
- energy storage and stand- alone systems.
- fire alarm systems.
Chapter8 : Communications Systems
stands apart from the rest of the NEC and can be used alone except in those cases where it is a requirement of Chapter 8 that some other part of the NEC be applied.
Chapter 9 :Tables
includes reference tables that contain information that can be used to satisfy requirements throughout the NEC.