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MCC's or Motor Control Centersare an assembly of one or more sections that contain a common power bus. These have been used in the auto trade ever since the 1950's, since they were made use of a lot of electric motors. Today, they are utilized in various commercial and industrial applications.
Motor control centers are a modern practice in factory assembly for some motor starters. This machinery can comprise metering, variable frequency drives and programmable controllers. The MCC's are usually utilized in the electrical service entrance for a building. Motor control centers often are utilized for low voltage, 3-phase alternating current motors which range from 230 V to 600V. Medium voltage motor control centers are designed for large motors which range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments to be able to achieve power switching and control.
In places where extremely dusty or corrosive processes are taking place, the motor control center can be established in a separate air-conditioned room. Usually the MCC would be located on the factory floor close to the equipment it is controlling.
A MCC has one or more vertical metallic cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers can be unplugged from the cabinet so as to complete testing or maintenance, while really large controllers can be bolted in place. Each and every motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, fuses or circuit breakers in order to provide short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers provide wire ways for field control and power cables.
Each and every motor controller inside a motor control center could be specified with several choices. These options comprise: extra control terminal blocks, control switches, pilot lamps, separate control transformers, as well as numerous kinds of bi-metal and solid-state overload protection relays. They also have different classes of types of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are several alternatives for the consumer. These can be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they can be supplied prepared for the customer to connect all field wiring.
MCC's usually sit on floors which should have a fire-resistance rating. Fire stops could be needed for cables that penetrate fire-rated walls and floors.
