Single-line diagram

Also known as SLD

A single-line diagram is a simplified electrical drawing that shows the main connection path between the grid, protection devices and home energy equipment.

A single-line diagram, often shortened to SLD, is a simplified electrical drawing that shows how the main parts of an installation are connected without drawing every individual conductor or cable core. In home energy paperwork it may show the grid supply, meter, consumer unit or switchboard, isolators, inverter, solar PV array, battery, EV chargepoint, export-limiting meter or CT clamps and the point of connection. It is used to explain an electrical connection arrangement to installers, DNOs, manufacturers or later maintainers, but it is not the same as a full wiring diagram, commissioning record, DNO approval letter, G98 or G99 application, G100 declaration, certificate or warranty document.