Why do I need a single-line diagram?įor everyday operations and maintenance, as well as engineering power system studies.īoth require that the electrical single line diagram be kept up-to-date and available. In this post, I will show why you need an SLD and how to make it. This electrical one line diagram is the primary reference for maintenance and operations for lockout/tagout procedures, as well as for any engineering power system studies. Having a ‘single-line’ allows the diagram to stay readable despite communicating a lot of information about an electrical system. Below is the CSA Z462 single line diagram definition:Ī4.1.1 Single-Line (One-Line) Diagram: A diagram which shows, by means of single lines and graphic symbols, the course of an electric circuit or system of circuits and the component devices or parts used therein. A single-line diagram (SLD) is a high-level schematic diagram showing how incoming power is distributed to equipment.
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