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Main power input: The distribution box receives electrical power from the main electrical service entry point, such as the utility meter or main circuit breaker. Circuit breakers or fuses: Distribution boxes typically contain multiple circuit breakers or fuses, each responsible for controlling power to a specific electrical circuit. These circuit breakers or fuses serve as protection devices that interrupt the electrical supply in case of overload, short circuit, or other electrical faults to prevent damage and ensure safety. Branch circuits: Branch circuits refer to the individual circuits that provide power to different areas or devices within a building, such as lighting, appliances, and outlets. Each branch circuit is protected by its own circuit breaker or fuse in the distribution box. Neutral and ground bars: The distribution box has separate bars for neutral and ground connections. The neutral bar connects all the neutral wires from the various branch circuits, while the ground bar connects all the ground wires. Proper grounding is crucial for electrical safety. Bus bars: Bus bars are conductive metal strips or bars within the distribution box that distribute the electrical power from the main input to the individual circuit breakers or fuses. Enclosure: Distribution boxes are usually housed in a metal or plastic enclosure to protect the electrical components and prevent accidental contact