ELECTRICITY has been an essential part of our lives since the late nineteenth century. During the early twentieth century, electricity routinely began replacing steam as the primary power source in industrial plants. As factories became larger and more complex, so did their power requirements. As such, engineers were faced with a new challenge: how to distribute electricity safely, reliably, and economically within the industrial facility. Although this challenge has been addressed for over a century, the theories, requirements, and procedures for safe, reliable, and economical industrial power distribution have not been presented in textbook form. This work attempts to do so by drawing on more than a hundred years of lessons learned and refinements in the electrical power distribution field.