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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.
Its size is usually proportional to the size of the building; large buildings may have a main electrical room and subsidiary electrical rooms. Electrical equipment may be for power distribution equipment, or for communications equipment. [1] Electrical rooms typically house the following equipment: Electric switchboards; Distribution boards
For simple radial distribution systems with only a few elements, hand calculation is feasible, but computer software is generally used for more complex systems. Where rotating machines (generators and motors) are present in the system, the time-varying effect of their contribution to a short circuit may be evaluated.
A low-voltage switchboard A modern electric switchboard. An electric switchboard is a piece of equipment that distributes electric power from one or more sources of supply to several smaller load circuits. It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the ...
Grounding (earthing) of distribution circuits is a notable difference in practice between wiring systems of the United States and those of other regions. Since the early 1960s, wiring in new construction has required a separate grounding conductor used to bond (electrically connect) all normally non-current carrying parts of an electrical ...
Types used in commercial and industrial low-voltage distribution systems are rated to safely interrupt 200,000 amperes. The rating of power circuit breakers varies according to the application voltage; a circuit breaker that interrupts 50,000 amperes at 208 volts might be rated to interrupt only 10,000 amperes at 600 volts, for example.
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The term switchboard, when used by itself, may refer to: Telephone switchboard; Electrical controls: Electric switchboard in industrial applications like electricity generation; Distribution board in residential and commercial applications; Printed circuit board; Mixing console; Switchboard, another term a helpline.