This AutoCAD DWG file includes a complete Single Line Diagram (SLD) of a Distribution Board, showing circuit breakers, wiring connections, and load distribution for lighting, power, and mechanical systems. The DB panel board controls the flow of electricity. It ensures that circuits are safe, organized, and easy to manage. A properly installed electrical distribution box is important for. An Electrical Distribution Board (DB) is an essential component of any electrical system — it receives power from the Main Distribution Board (MDB) and distributes it to various sub-circuits or equipment. Something went wrong with the 3D viewer.