The NFPA 70: National Electrical Code (NEC), 2017 Edition is an authoritative model code that establishes minimum electrical design and installation safety requirements to safeguard people and property from electrical hazards. Developed through a rigorous consensus process by the National Fire Protection Association and approved as a recognized American National Standard, the NEC provides rules governing electrical conductors, equipment, raceways, overcurrent protection, grounding and bonding, wiring methods, and special occupancy considerations.
The 2017 edition incorporates hundreds of changes over previous versions to address advances in technology and evolving applications of electrical systems. It expands coverage to include renewable energy systems, energy storage installations, microgrid configurations, and enhanced safety labeling and clearances. NEC chapters are structured to guide users from general requirements to specific installations, supported by informative annexes for tables, examples, and application guidance.
Professionals such as electricians, engineers, inspectors, contractors, code officials, and designers rely on the NEC as the foundation for designing and installing safe electrical systems in buildings and structures. Its widespread adoption across U.S. states and local jurisdictions makes the 2017 edition a fundamental reference for compliance, safety, and good practice in electrical work.
