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MCC's or likewise known as Motor Control Centersare an assembly of one or more sections which include a common power bus. These have been used in the auto trade ever since the 1950's, in view of the fact that they were utilized lots of electric motors. Now, they are utilized in various industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are somewhat common technique. The MCC's 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 frequently are utilized for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are designed for big motors that range from 2300V to 15000 V. These units make use of vacuum contractors for switching with separate compartments in order to achieve power switching and control.
In factory area and locations which have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Normally the MCC would be situated on the factory floor adjacent to the equipment 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 can be unplugged from the cabinet so as to complete testing or maintenance, while really big controllers can be bolted in place. Each motor controller consists of a contractor or a solid state motor controller, overload relays so as to protect the motor, fuses or circuit breakers to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to enter the controller. The motor is wired to terminals located within the controller. Motor control centers provide wire ways for field control and power cables.
Every motor controller in a motor control center could be specified with various alternatives. These choices comprise: separate control transformers, extra control terminal blocks, control switches, pilot lamps, and various types of solid-state and bi-metal overload protection relays. They even comprise different classes of types of circuit breakers and power fuses.
There are lots of choices concerning delivery of MCC's to the client. They could be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller along with internal control. Conversely, they could be supplied prepared for the client to connect all field wiring.
MCC's commonly sit on floors which must have a fire-resistance rating. Fire stops could be required for cables which penetrate fire-rated walls and floors.
