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Motor Control Centers or also called MCC's, are an assembly of one or more enclosed sections, that have a common power bus mostly consisting of motor control units. They have been used since the 1950's by the automobile industry, because they made use of lots of electric motors. Today, they are used in a variety of commercial and industrial applications.
Within factory assembly for motor starter; motor control centers are somewhat common technique. The MCC's comprise variable frequency drives, programmable controllers and metering. The MCC's are normally used in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors which vary from 230 volts to 600 volts. Medium voltage motor control centers are intended for big motors that vary from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments in order to attain power switching and control.
In locations where extremely dusty or corrosive methods are occurring, the motor control center could 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 in order to complete maintenance or testing, while extremely big controllers can be bolted in place. Each motor controller has a solid state motor controller or a contractor, overload relays to be able to protect the motor, fuses or circuit breakers in order to supply 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 inside the controller. Motor control centers offer wire ways for power cables and field control.
Each and every motor controller within a motor control center can be specified with different alternatives. These alternatives consist of: extra control terminal blocks, control switches, pilot lamps, separate control transformers, as well as many types of bi-metal and solid-state overload protection relays. They likewise comprise different classes of types of power fuses and circuit breakers.
There are numerous choices regarding delivery of MCC's to the customer. They can be delivered as an engineered assembly with interlocking wiring to a central control terminal panel board or programmable controller together with internal control. On the other hand, they can be provided set for the customer to connect all field wiring.
MCC's usually sit on floors which should have a fire-resistance rating. Fire stops can be required for cables which penetrate fire-rated walls and floors.
