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Motor Control Centers or MCC's, are an assembly of one enclosed section or more, that have a common power bus principally comprising motor control units. They have been used since the 1950's by the automobile business, for the reason that they utilized a large number of electric motors. Now, they are used in other industrial and commercial applications.
In factory assembly for motor starter; motor control centers are fairly common method. The MCC's comprise metering, variable frequency drives and programmable controllers. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers often are used for low voltage, 3-phase alternating current motors which vary from 230 V to 600V. Medium voltage motor control centers are designed for big motors which range from 2300 volts to 15000 volts. These units utilize vacuum contractors for switching with separate compartments so as to achieve power switching and control.
In locations where very corrosive or dusty methods are happening, the motor control center could be installed in a separate air-conditioned room. Typically the MCC would be located on the factory floor close to the machinery it is controlling.
For plug-in mounting of individual motor controls, A motor control center has one or more vertical metal cabinet sections with power bus. In order to complete testing or maintenance, really large controllers can be bolted into place, whereas smaller controllers may be unplugged from the cabinet. Every motor controller consists of a contractor or a solid state motor controller, overload relays to protect the motor, circuit breaker or fuses to supply short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors enable 3-phase power to be able 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 within a motor control center could be specified with various choices. These options consist of: control switches, pilot lamps, separate control transformers, extra control terminal blocks, as well as many kinds of solid-state and bi-metal overload protection relays. They even have different classes of types of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are many options for the customer. These can be delivered as an engineered assembly with a programmable controller together with internal control or with interlocking wiring to a central control terminal panel board. On the other hand, they can be provided prepared for the customer to connect all field wiring.
Motor control centers typically sit on the floor and must have a fire-resistance rating. Fire stops can be required for cables that penetrate fire-rated walls and floors.
