To design the electrical portions of an industrial plant or a commercial building requires knowledge of power, lighting, and control. This chapter focuses on a work of an electrical engineer, designing a new facility. This “role playing” experience will enable the reader to gain a better understanding of the elements that go into the design, to deal better with contractors and in-house designers, and to interpret the design of an existing facility. Three elements usually comprise the basis of electrical design, namely technical proficiency, cost considerations, and overall schedules. The first step for the electrical engineer/designer is to help the client establish needs. The design engineer studies all aspects of the client’s requirements and establishes the design criteria. Once the design criteria have been established the production of the job can begin; designs and specifications to meet the job criteria can be made. Design activities are involved in the preparation of the various diagrams required for the project installation.