A one-line diagram for an electric power distribution system is an electrical drawing that uses single lines and graphic symbols to illustrate the current path, voltage values, circuit disconnects, fuses, circuit breakers, transformers, and panelboards. Check electrical parameters: First understand the basic electrical parameters of Distribution box so that you can have a general understanding of the capacity and performance of the distribution box. Analyze the incoming line part: Determine the incoming line source of the distribution box and. how the main components of the electrical system are connected. You will be able to follow the flow of power through the power distribut on system from the incoming power source to each downstream load. Outgoing feeders from a primary distribution substa-tion are typically feeding secondary distribution substations and bigger, most often industrial type, consumers. Our integrated circuits and reference designs for automotive power distribution box (PDB) provide you with a total PDB or smart junction box system design including LDOs, CAN and LIN in-vehicle networking, limp home functionality and smart power switches. Many types meters are used in panel like as Analog meter and digital meters.