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MCC's or Motor Control Centersare an assembly of one section or more which have a common power bus. These have been utilized in the automobile industry ever since the 1950's, in view of the fact that they were used a lot of electric motors. These days, they are used in a variety of industrial and commercial applications.
Motor control centers are a modern technique in factory assembly for some motor starters. This machine can include programmable controllers, metering and variable frequency drives. The MCC's are commonly used in the electrical service entrance for a building. Motor control centers commonly are used for low voltage, 3-phase alternating current motors that vary from 230 volts to 600 volts. Medium voltage motor control centers are designed for big motors which vary from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
Inside factory locations and area which have dusty or corrosive processing, the MCC could be installed in climate controlled separated locations. Usually the MCC would be situated on the factory floor next to the equipment 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. To complete testing or maintenance, extremely big controllers could be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Each and every motor controller has a contractor or a solid state motor controller, overload relays to protect the motor, fuses or circuit breakers to supply short-circuit protection and a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power in order to enter the controller. The motor is wired to terminals situated inside the controller. Motor control centers provide wire ways for field control and power cables.
Each and every motor controller within a motor control center could be specified with several alternatives. These alternatives include: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many types of bi-metal and solid-state overload protection relays. They even have various classes of types of power fuses and circuit breakers.
There are many options 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 together with internal control. On the other hand, they can be provided set for the client to connect all field wiring.
MCC's usually sit on floors that are required to have a fire-resistance rating. Fire stops may be necessary for cables which penetrate fire-rated walls and floors.
