The NFPA 70 National Electrical Code NEC 2017 Edition SPIRAL is a textbook published by the National Fire Protection Association. It covers the subject areas of technology and engineering, specifically focusing on electrical codes and regulations. The book is designed in a spiral format, making it easier to reference and study on a daily basis. With a publication year of 2017, this textbook is a valuable resource for those in the construction and electrical industries, providing essential information for students and professionals alike.