For over a century, this practical handbook has served as the definitive industry reference for information on designing, installing, operating, and maintaining electrical systems and equipment. This seventeenth edition has been thoroughly revised to comply with the most recent (2020) National Electrical Code and National Electrical Safety Code. , covers current energy-efficient technologies, such as Power over Ethernet (PoE), photovoltaics and induction lighting, and contains a new chapter that clearly explains new industry safety methods, along with detailed coverage of how those procedures correlate with OSHA requirements. Detailed photos, diagrams, charts, tables, and calculations are included. This is a practical, on-the-job resource for every professional electrician. Covers: