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See Figure 3.įeeder busways deliver the power from the source to a load-consuming device. The two basic types of busways are feeder and plug-in busways. This allows the distribution system to have maximum flexibility with simple and easy connections as work is performed on installations.
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Prefabricated elbows, tees, and crosses make it possible for the electric power to run up, down, and around corners and to be tapped off from the distribution system. The most common length of busways is 10′. The electrical distribution system in a plant must transport the electric power from the source of supply to the loads. Busways enable manufacturing plants to be retooled or re-engineered without major changes in the distribution system.įigure 2. To offer protection from the high voltage, the conductors of a busway are supported with insulating blocks and covered with an enclosure to prevent accidental contact.Ī typical busway distribution system provides for fast connection and disconnection of machinery. This is because the power in a plant distribution system is at a high level. When sections are bolted together, electric power is available at many locations and throughout the system.Ī busway does not have exposed conductors. Prefabricated fittings, tees, elbows, and crosses simplify the connection and reconnection of the distribution system. In many cases where it is common to shift production machinery, the distribution system must be changed from time to time.Ī busway is a metal-enclosed distribution system of busbars available in prefabricated sections. In large buildings, the distribution may be over large areas with many different electrical requirements throughout the building. The electrical distribution system of a building must transport electric power from the source of power to the loads. The distribution panels route power to individual loads such as industrial equipment, motors, lamps, and computers. The high voltage is then stepped down to low voltage levels and delivered to distribution panels. High voltages are used for the distribution of large amounts of electric power using small conductor sizes. One-line diagrams use single lines and symbols to show system components and operation.įor example, a one-line diagram may show a 13.8 kV feed into a building and the transformers used for the distribution of specific voltages. They are also used to determine electric power shut-off points, future expansion capacity, and where emergency backup generators or secondary power systems are connected into the system.Ī one-line diagram is helpful when troubleshooting an electric power system and can show the entire distribution system or specific parts of a system. You May Also Read: Electrical Power: Transmission & Distribution | Distribution Substation Components.
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One-line diagrams are also used when troubleshooting distribution system problems such as loss of electric power, low voltage, blown fuses, tripped circuit breakers, and poor power quality.
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One-line diagrams are also used when designing large commercial and industrial installations to show the path of electric power throughout a building. One-line diagrams use the most basic symbols because the intent of the drawing is to illustrate as clearly as possible the flow of current throughout the building distribution system and where each component or device connects into the system.