Main electrical panel wiring refers to the wiring diagram of a main electrical panel, which houses the electrical power from the electric meter and circuit breakers. The main wiring usually consists of two thick black wires that comes from the utility company via the electric meter: the main circuit breaker and an earth-grounding wire. The grounding wire connects to a solid copper rod driven into the soil below the panel.
The main electrical panel, also called the electrical service panel, redistributes power to every electrical circuit inside a house via designated circuit breakers that automatically cut supply if there is a shorted electrical connection. In larger homes or buildings, an electrical sub-panel is connected to the main electrical panel.
The electrical panels that are commonly seen in houses today were first invented to replace the fuse box in the 1960s and were immediately accepted by builders because of their safety features, according to About.com. Some of the modern electrical panels' safety features include expandability to accommodate additional circuit branches. Electric supply can be immediately restored to a branch by just flipping the circuit breaker's switch. The newer panels offer better electrical surge protection compared to fuses, and homeowners can easily identify which circuit breaker needs resetting.