The 2017 Key Word Index by Tom Henry, distributed through 1 Exam Prep, is a comprehensive reference tool designed to accompany the 2017 National Electrical Code (NEC). Published by Tom Henry’s Code Electrical Classes, this index provides alphabetical listings of critical NEC terms and code references, enabling electricians and exam candidates to quickly locate specific code sections during open-book licensing exams. The guide aligns with the National Fire Protection Association (NFPA 70) standards and is widely used in PSI and state electrical contractor testing. Organized for efficient navigation, it supports electrical contractors, journeyman electricians, and master license applicants in understanding code language, grounding rules, wiring methods, and general electrical installation requirements consistent with 2017 NEC exam content outlines.