This is THE book every electrician should own. This comprehensive self-study electrical calculations textbook is based on the 2020 NEC with ten (10) practice calculations exams consisting of twenty-five (25) questions each and a final exam of 100 questions.This calculations textbook covers most topics that are included on all journeyman and master licensing exams such as conductor sizing and protection, motors, transformers, voltage drop, demand loads, box and conduit sizing, over-current protection plus 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. Solutions are included.