New and updated features of this title Alignment with 2026 electrical codes UPDATED: The 2026 National Electrical Code® was incorporated throughout the 12th Edition, resulting in fully updated, industry-aligned content. UPDATED: All illustrations and instructional materials were revised to reflect the latest code requirements and technological advancements. New and reorganized content NEW: A new dwelling load calculations module combines all residential load calculations topics into one module, with improved step-by-step instructions for calculations. NEW: A new alternative energy module discusses safety issues, systems integration requirements, and equipment needs for solar, wind and other alternative energy sources. REVISED: The transformer modules were merged to join relevant concepts, and the controls modules were consolidated, improving clarity and coherence.