The electrical systems in building construction can be grouped under four major headings: Power, Lighting, Motor Control Centers, and Special Systems. Like mechanical systems, electrical systems have three distinct portions: Source, Conductor/Connection, and Terminal Unit. For example,take lighting: the source is a wall switch, the conductor/connector is wiring in conduit, and the terminal unit is the fixture. The first two components, the source and the conductor/connector, represent the rough-in phase of the project, and the terminal unit represents...