Residential Panel Board Diagram. The national electrical code nec defines a panelboard as a single panel or group of panel units designed for assembly in the form of a single panel including buses and automatic overcurrent devices and equipped with or without switches for the control of light heat or power circuits. A load center i e breaker box fuse box takes electricity from the utility source and distributes it throughout a facility to support reliable electrical distribution.
A service panel is a steel box with a hinged door or lift up panel on the front. Behind the panel door. Nema 3r if exposed to weather.
The distribution of power to the various circuits is protected from over current by the use of circuit breakers or fuses.
Nec 110 3 electrical equipment equipment listing and labeling all electrical equipment including luminaires devices and appliances used as part of or in connection with an electrical. This is not a diy project for most homeowners. With the door open you can access all the circuit breakers in the panel. Designed to be placed in a cabinet or cutout box.