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For Safetys Sake




Single Line Diagram


Whether a building is old or new, electrical engineers depend on single-line diagrams (SLDs) to track the electrical components that assure proper maintenance and safety practices. Serving as a map of the electrical distribution system in a facility, an SLD documents conductors, transformers, overcurrent protective devices (OCPDs) and other electrical devices and safety mechanisms to aid in many areas of design and maintenance while reducing confusion.

An SLD is a primary resource to calculate short-circuit currents, determine selective coordination and, ultimately, calculate incident energy—making it one of the most important safety documents at a facility’s disposal. While critical to the safe operation of a facility, SLDs all too often don’t get the attention they warrant.




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