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Motor Control Centers or MCC's, are an assembly of one enclosed section or more, which have a common power bus principally containing motor control units. They have been used since the 1950's by the vehicle industry, because they used lots of electric motors. Nowadays, they are used in a variety of industrial and commercial applications.
Motor control centers are a modern method in factory assembly for some motor starters. This particular equipment could comprise metering, variable frequency drives and programmable controllers. The MCC's are usually found in the electrical service entrance for a building. Motor control centers commonly are utilized for low voltage, 3-phase alternating current motors that vary from 230 V to 600V. Medium voltage motor control centers are intended for big motors that range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments to be able to accomplish power switching and control.
In places where really corrosive or dusty processes are taking place, the motor control center can be established in a separate air-conditioned room. Typically the MCC will be situated on the factory floor close to the machines 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 can be bolted into place, whereas smaller controllers can be unplugged from the cabinet. Each 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 as well as a disconnecting switch to be able to isolate the motor circuit. Separate connectors allow 3-phase power so as to enter the controller. The motor is wired to terminals situated within the controller. Motor control centers offer wire ways for power cables and field control.
Every motor controller in a motor control center could be specified with several choices. These options comprise: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and many types of solid-state and bi-metal overload protection relays. They likewise have various classes of kinds of circuit breakers and power fuses.
Concerning the delivery of motor control centers, there are a lot of choices for the client. 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. Conversely, they can be supplied set for the client to connect all field wiring.
MCC's commonly sit on floors which are required to have a fire-resistance rating. Fire stops could be necessary for cables that penetrate fire-rated walls and floors.
