What is the primary purpose of a single-line (one-line) diagram?

The primary purpose of a single-line or one-line diagram is to indicate paths and interconnections in a circuit. This type of diagram simplifies complex electrical systems by representing multiple conductors and components in a streamlined way, using a single line to illustrate the various electrical connections. It provides a clear and concise overview of how the electrical components are interconnected, allowing for easier understanding and analysis of the system's functionality.

In practical use, one-line diagrams are essential for grasping the overall circuit design, as they can depict the relationships between transformers, generators, switchgear, and loads without overwhelming the viewer with extensive details. This makes it an invaluable tool for engineers and technicians when planning, operating, or modifying electrical systems.