Here is an electrical wiring diagram for a residential building, detailing the circuitry that powers lighting and ceiling fans in three different rooms. The diagram shows the connections from the switches to the lights and fans, as well as the wiring that links back to the main distribution board (SDB Box), which is connected to an inverter power supply (IPS) system with a battery backup. It is an important tool for electricians and engineers during the installation or troubleshooting of electrical systems within residential structures.