NFPA 70: National Electrical Code (NEC), 2020 Edition

The revised and expanded 2020 edition of NFPA 70, National Electrical Code, features state-of-the-art information for safe electrical practices for public and private buildings, homes and structures, outdoor yards and lots, utility equipment, installations that connect to the power grid, and consumer-owned power generation systems and equipment. Content has been added, edited, and reorganized to address safety for workers, energy systems and electric vehicles, limited energy, and communication systems. Impactful changes include: New requirements for exterior emergency disconnects of one- and two-family dwellings for improved electrical safety for emergency responders Revisions to service disconnect rules to help protect electrical workers from arc flash hazards Adapted and adjusted requirements for installation practices of new technologies to meet the evolving demand of power over Ethernet Updates to modernize tables currently in use for calculations to reflect improvements in energy