Line design is a very specialized field involving spatial constraints, high performance conductors, lightning protection, cable vibrations, digital terrain surveying, Fiber optic communication wires along with some exciting software developments over the past two decades.In the West, billions of dollars are being invested on building new lines and the so-called “Smart Grid”.This book will cover electrical and mechanical characteristics associated with high-voltage transmission lines, selection of conductors, line layout, thermal ratings, plan and profile drawing among other things.Structures are only one component of a transmission line; as such, this book will form a companion volume to the book on structures and foundations. The book is aimed at students, practicing engineers, technicians and linemen, researchers and academics.It will contain beneficial information to those involved in the management and maintenance of high voltage transmission lines and associated component systems.For those in academia, it will be an adequate textbook for (under)graduate courses centering on the topic.Asset managers at utilities and state-level electrical corporations should find the book a useful reference work during system and line maintenance operations.