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This self-study exam prep book is based on the 2011 NEC with ten practice calculations exams consisting of 25 questions each and a final exam of 100 questions. This calculations book covers most topics that are included on all journeyman and master electricians exams such as conductor sizing and protection, motors, transformers, voltage drop, demand loads, box and conduit sizing, over-current protection and residential and commercial load calculations. The text contains the most widely used electrical calculations and formulas the reader needs to pass the journeyman and master electrical competency exam.