What is the source for circuits in a house?

The Service Entrance Panel (SEP) is the main point where electrical power is brought into a house from the utility company. It acts as the primary interface between the external power supply and the internal wiring of the home, managing the flow of electricity throughout the various circuits. The SEP is equipped with circuit breakers or fuses, which provide protection by interrupting the electrical flow in the event of overloading or fault conditions.

By distributing electrical power throughout the residence, the Service Entrance Panel ensures that each circuit receives the necessary voltage and current based on the household requirements. It is essential for safeguarding the entire electrical system, ensuring that appliances and devices operate safely and efficiently.