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Motor Control Centers or likewise called MCC's, are an assembly of one enclosed section or more, that have a common power bus mainly containing motor control units. They have been utilized ever since the 1950's by the automobile industry, in view of the fact that they utilized a large number of electric motors. These days, they are utilized in other commercial and industrial applications.
Motor control centers are a modern practice in factory assembly for several motor starters. This particular machine could consist of 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 used for low voltage, 3-phase alternating current motors that range from 230 volts to 600 volts. Medium voltage motor control centers are intended for large motors which range from 2300V to 15000 V. These units utilize vacuum contractors for switching with separate compartments in order to attain power switching and control.
In locations where really corrosive or dusty methods are occurring, the motor control center can be installed in a separate air-conditioned room. Normally the MCC would be positioned on the factory floor near the equipment it is controlling.
A MCC has one or more vertical metal cabinet sections with power bus and provisions for plug-in mounting of individual motor controllers. Smaller controllers may be unplugged from the cabinet in order to complete testing or maintenance, while very big controllers could be bolted in place. Every motor controller has a solid state motor controller or a contractor, overload relays to protect the motor, circuit breaker or fuses to provide 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 positioned inside the controller. Motor control centers provide wire ways for power cables and field control.
Inside a motor control center, every motor controller could be specified with lots of different options. Some of the options consist of: pilot lamps, separate control transformers, extra control terminal blocks, control switches, and various 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 a lot of choices 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 could be provided ready for the customer to connect all field wiring.
MCC's generally sit on floors which must have a fire-resistance rating. Fire stops could be necessary for cables which penetrate fire-rated walls and floors.
