Electrical Exam Prep Master/Contractor Textbooks, 2023 NEC This self-study book program provides in-depth instruction on Theory, Code, and Calculations. You can use it to prepare for the Electrical Master/Contractor license exam based on the 2023 NEC. It’s recommended for those with at least one year of experience and some basic electrical background. Includes:Electrical Exam Preparation Textbook.Understanding the NEC, Volume 1, Articles 90-480 Textbook.Understanding the NEC, Volume 2, Articles 500-810 Textbook.Understanding Electrical Theory Textbook.Plus:Digital answer keysMaster Electrician Simulated ExamDigital version of each textbook