DOE-HDBK-1016/1-93ELECTRICAL DIAGRAMS AND SCHEMATICSElectrical Diagrams and SchematicsFigure 12 Schematic of a Car's Electrical CircuitWhen dealing with a large power distribution system, a special type of schematic diagram calledan electrical single line is used to show all or part of the system. This type of diagram depictsthe major power sources, breakers, loads, and protective devices, thereby providing a usefuloverall view of the flow of power in a large electrical power distribution system.On power distribution single lines, even if it is a 3-phase system, each load is commonlyrepresented by only a simple circle with a description of the load and its power rating (runningpower consumption). Unless otherwise stated, the common units are kilowatts (kW). Figure 13shows a portion of an electrical distribution system at a nuclear power plant.PR-03Rev. 0Page 12
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