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Motor Control Centers or otherwise called MCC's, are an assembly of one enclosed section or more, which have a common power bus mainly comprising motor control units. They have been utilized ever since the 1950's by the auto business, because they used lots of electric motors. These days, they are used in various industrial and commercial applications.
Inside factory assembly for motor starter; motor control centers are quite common practice. The MCC's comprise metering, variable frequency drives and programmable controllers. 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 vary from 230 V to 600V. Medium voltage motor control centers are designed for big motors which vary from 2300V to 15000 V. These units use vacuum contractors for switching with separate compartments so as to achieve power control and switching.
In places where really corrosive or dusty processes are happening, the motor control center could be installed in a separate air-conditioned room. Usually the MCC will be positioned on the factory floor next to the machines 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 to complete maintenance or testing, whereas extremely big controllers could be bolted in place. Each and every motor controller has a contractor or a solid state motor controller, overload relays so as to protect the motor, fuses or circuit breakers to be able to supply short-circuit protection and a disconnecting switch so as to isolate the motor circuit. Separate connectors allow 3-phase power to be able to enter the controller. The motor is wired to terminals positioned in the controller. Motor control centers supply wire ways for power cables and field control.
Each motor controller inside a motor control center could be specified with various options. These alternatives include: 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 also have different classes of kinds of power fuses and circuit breakers.
There are various alternatives 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 along with internal control. Conversely, they could be supplied set for the customer to connect all field wiring.
Motor control centers typically sit on the floor and must have a fire-resistance rating. Fire stops can be necessary for cables which go through fire-rated walls and floors.
