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A distribution board (also known as panelboard, circuit breaker panel, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.
The 2008 code did away with the previous 42 circuit limitation on panelboards. [3] One can now order panelboards with as many as 84 circuit places, and a corresponding ampacity rating. If a panelboard with a sufficient number of breaker positions is installed in the first place, the need for non-CTL breakers should be eliminated.
Wiring diagrams will also include panel schedules for circuit breaker panelboards, and riser diagrams for special services such as fire alarm or closed-circuit television or other special services. See also
A circuit breaker is an electrical safety device ... interrupting capacity to use at a panel board; these circuit breakers are called "supplemental circuit protectors ...
Main electrical distribution room in a large building. The back of an antique electrical room, still operational at a US plant as of 2014. All conducting busbars are open and operators must be careful not to touch them.
Each motor controller in an MCC can be specified with a range of options such as separate control transformers, pilot lamps, control switches, extra control terminal blocks, various types of thermal or solid-state overload protection relays, or various classes of power fuses or types of circuit breakers.