This book addresses all aspects applicable to three-phase circuits, including ac circuits, generation, transmission, distribution, grounding, currents, power, demand, metering, circuit protection, motors, motor protection, power factor correction, tariffs, electrical drawings, and relays. It also covers all possible types of three-phase circuits for all possible applications: balanced, unbalanced, leading, lagging, three-wire, and four-wire. Using simple terms and straightforward language to explain key concepts and their underlying theory, this contemporary educational guide employs phasors throughout the text and features numerous examples, illustrations, photographs, and end-of-chapter problems.