An electrical distribution panel that houses circuit breakers or fuses to control and protect individual electrical circuits in buildings.

A panelboard is an electrical distribution panel that houses circuit breakers or fuses to control and protect individual electrical circuits throughout a building or facility. These essential components of electrical systems serve as the central distribution point where electrical power from the main service entrance is divided into smaller, manageable circuits that supply power to lights, outlets, equipment, and other electrical loads. Panelboards provide overcurrent protection, circuit isolation capabilities, and a means for electrical maintenance and troubleshooting, making them critical safety devices that prevent electrical fires, equipment damage, and electrical hazards while ensuring reliable power distribution to all areas of a building.

Panelboards are used in various applications including residential installations where they distribute power to lighting circuits, outlet circuits, and major appliances throughout homes, commercial buildings such as offices, retail spaces, and warehouses where they serve multiple floors and tenant spaces, industrial facilities including manufacturing plants and processing facilities that require heavy-duty power distribution, institutional buildings like schools, hospitals, and government facilities with complex electrical requirements, and specialty applications such as data centers, laboratories, and clean rooms that need precise power control and monitoring. Each application requires specific panelboard configurations based on load requirements and safety standards.

The construction and components of panelboards include the enclosure or cabinet that provides physical protection and houses all internal components, bus bars that carry the main electrical current and distribute it to individual circuit breakers, circuit breakers or fuses that provide overcurrent protection for individual circuits, neutral and ground bars that provide safe return paths for electrical current, and mounting hardware that secures the panelboard to walls or structures. Modern panelboards may also include monitoring devices, surge protection, and communication interfaces for building automation systems.

Fun Fact: The first electrical panelboards were developed in the 1880s for Thomas Edison’s direct current electrical systems, using knife switches and fuses, evolving into today’s sophisticated circuit breaker panels that provide much safer and more reliable electrical distribution.