The information on the SLD can be used for different types of power system studies for your site. The studies and drawings shall be readily available and maintained on a consistent basis.Ī main program shall include the continual upkeep and review of the following power system studies and drawings:
Power system studies and one-line drawings are critical to the safe and reliable operation of electrical power systems. “6.12.3 Power system studies and single line diagram Having an up-to-date SLD is required to complete a power system study. Having an up-to-date SLD can help avoid longer downtimes and keep everyone safe. Check applicable up-to-date drawings, diagrams, and identification tags.” - CSA Z462 “4.2.5 Process for establishing and verifying an electrically safe work conditionĪ) Determine all possible sources of electrical supply to the specific equipment. Use up-to-date diagrams in establishing an electrically safe work condition. Suitable documentation, including up-to-date drawings and diagrams, shall be consulted to ensure that no electrical circuit interlock operation can result in re-energizing the circuit being worked on.” - CSA Z462 SLDs help verify electrical circuit interlocks will not result in the re-energization of the circuit being worked on. To plan your lockout/tagout procedures, you need up-to-date primary sources of information.Ī lockout procedure shall be developed on the basis of the existing electrical equipment and system and shall use suitable documentation, including up-to-date drawings and diagrams.” - CSA Z462 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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