What type of plan provides an overview of power distribution for an entire electrical system?

A one-line plan offers a simplified representation of an entire electrical system, detailing the power distribution and connectivity among various components. It illustrates the flow of electricity from the source through transformers, switchgear, panels, and loads without the complexity of individual circuits, making it easier to understand the overall structure at a glance. This type of plan is particularly beneficial for engineers, technicians, and electricians to comprehend how power is distributed throughout a building or facility.

In contrast, three-line diagrams provide a more detailed look at three-phase power systems, showing how individual conductors are wired, while block diagrams depict systems in terms of components or functions without focusing directly on electrical specifics. Electric service plans typically outline how electricity from the grid is delivered to a specific location but may lack the comprehensive overview provided by a one-line diagram. Consequently, the one-line plan is the most effective choice for a broad perspective on electrical power distribution.