The simpler diagram leaves more space for non-electrical to be included.Serving as a map of the electrical distribution system, 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. Learn about the one-line diagram, a type of electrical drawing that represents the principal components of a complex system in a single line.It is the primary resource to calculate short-circuit currents, determine selective coordination and, ultimately, calculate incident energy.The original design drawings revised to reflect changes made in the field are created.A contractor installs an SLD, marking-up the SLD as changes are made.The engineer creates assumptions used to estimate fault-current calculations and selective coordination needs.Unless otherwise noted, the impedance shown on a one-line diagram is based on the transformer’s OA rating. The note, Z7.6, indicates that the impedance of the transformer is 7.6.
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