An electrical distribution line diagram is a simplified, one-line representation of a power distribution network. Also known as a single-line diagram (SLD), it uses standardized symbols to show the major components of the system and how they are connected.

These diagrams are essential for engineers and technicians because they provide a clear, high-level overview of the system without the clutter of a full schematic. They are used for:

• System Design & Planning: They are the blueprints used to plan the layout of electrical components and circuits.

• Troubleshooting: Technicians use them to quickly trace the path of power flow and pinpoint the location of faults.

• Safety & Maintenance: They are a critical tool for safety planning, as they show the location of circuit breakers and disconnects that must be isolated during maintenance.