Home Electrical Wiring- Diagram and Installation Basics HOME ELECTRICAL WIRING BASICS. It connects to the neutral bus in the breaker panel, which in turn is bonded to earth. In those devices that are powered via 3-lead cords, this wire grounds the case of the device. In the past, appliances did not use a safety ground wire and just had the neutral bonded to What is the difference between schematic diagram and Sep 25, 2017, Works with current from mA to A. A schematic diagram is a circuit which shows the connections in a clear and standardized way. A schematic diagram shows the components and their values and connections in an understandable manner. It is usually used to communicate or intended to convey the connections and working of the circuit to other engineers.