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In factory assembly for motor starter; motor control centers are fairly common practice. The MCC's include metering, variable frequency drives and programmable controllers. The MCC's are normally used in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are intended for big motors that vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments to be able to attain power switching and control.
Within factory area and locations that have corrosive or dusty processing, the MCC can be installed in climate controlled separated locations. Normally the MCC would be located on the factory floor near the machines it is controlling.
A MCC has one or more vertical metal cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers could be unplugged from the cabinet to complete testing or maintenance, whereas really large controllers can be bolted in place. Every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers supply wire ways for power cables and field control.
Within a motor control center, every motor controller could be specified with numerous different choices. Some of the alternatives include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and numerous kinds of solid-state and bi-metal overload protection relays. They even comprise various classes of types of circuit breakers and power fuses.
