A graphical representation of an electrical distribution system.

a schematic diagram of a three-phase power distribution system which uses one line to show all three phases

A diagram that shows, by means of lines and graphic symbols, the connection between a proposed installation of a Distributed Resource and the EPS. The one-line diagram should illustrate not only the proposed interconnection but also the type and size of the generator, system voltage, service entrance equipment at the facility, transfer switch and/or switchgear, protection and metering of current transformers and voltage transformers, protective relaying, and control for the generator and interconnection system sufficient to communicate to a qualified engineer the essential design and safety of the system being considered. ( Example)