McGraw-Hill's National Electrical Code 2020 Handbook

McGraw-Hill's National Electrical Code 2020 Handbook, 30th Edition, serves as an on-the-job reference designed to help electrical professionals interpret and apply 2020 National Electrical Code rules. Authored by Frederic P. Hartwell, the volume functions as a practical companion to the official code.

Rather than reprinting official code text, the handbook focuses entirely on explaining regulations through plain-language commentary, advice, and background rationale. It highlights significant 2020 revisions, including reconditioned equipment standards, non-dwelling lighting load calculations, and expanded ground-fault circuit-interrupter requirements.

Because the volume is published independently of the NFPA, it directly evaluates ambiguous phrasing and drafting errors. It also provides thousands of detailed diagrams and photographs alongside practical strategies for resolving complex installation questions with electrical inspectors.