Circuit wiring power leaves the service panel via a hot (energized) wire — one with insulation that is black, red, or a color other than green or white — and returns to the panel through a neutral wire — one with white insulation. Another wire, bare or with green. A power distribution box (also known as a distribution board or panel) is an essential electrical device that receives power from the main source and distributes it to various circuits throughout a facility. It acts like a hub or traffic controller, managing power flow to different areas or devices. From the busbars, individual circuit breakers or fuses are connected.