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MCC's or likewise known as Motor Control Centersare an assembly of one or more sections which contain a common power bus. These have been used in the automobile industry ever since the 1950's, as they were used many electric motors. Nowadays, they are utilized in a variety of commercial and industrial applications.
Motor control centers are a modern method in factory assembly for some motor starters. This machine can consist of metering, variable frequency drives and programmable controllers. The MCC's are commonly found in the electrical service entrance for a building. Motor control centers frequently are used for low voltage, 3-phase alternating current motors which range 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 make use of vacuum contractors for switching with separate compartments so as to attain power control and switching.
In factory locations and area which have dusty or corrosive processing, the MCC can be installed in climate controlled separated locations. Normally the MCC will be located on the factory floor next to the machinery 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 so as to complete testing or maintenance, while extremely large controllers could be bolted in place. Each motor controller consists of a solid state motor controller or a contractor, overload relays In order to protect the motor, circuit breaker or fuses in order to provide short-circuit protection as well as a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power in order to enter the controller. The motor is wired to terminals situated in the controller. Motor control centers supply wire ways for power cables and field control.
Within a motor control center, each motor controller can be specified with many different alternatives. Some of the alternatives include: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and various kinds of bi-metal and solid-state overload protection relays. They even have different classes of kinds of power fuses and circuit breakers.
Concerning the delivery of motor control centers, there are a lot of choices for the consumer. These can be delivered as an engineered assembly with a programmable controller along with internal control or with interlocking wiring to a central control terminal panel board. Conversely, they could be provided prepared for the client to connect all field wiring.
Motor control centers usually sit on the floor and must have a fire-resistance rating. Fire stops can be needed for cables that penetrate fire-rated walls and floors.
