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MCC's or also known as Motor Control Centersare an assembly of one or more sections that have a common power bus. These have been used in the auto industry since the 1950's, since they were used many electric motors. These days, they are utilized in various commercial and industrial applications.
Motor control centers are a modern method in factory assembly for several motor starters. This particular machinery can consist of metering, variable frequency drives and programmable controllers. The MCC's are normally found in the electrical service entrance for a building. Motor control centers frequently 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 large motors that range from 2300 volts to 15000 volts. These units use vacuum contractors for switching with separate compartments so as to accomplish power switching and control.
Inside factory locations and area which have corrosive or dusty processing, the MCC could be installed in climate controlled separated locations. Typically the MCC would be located on the factory floor next to the equipment 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 be able to complete testing or maintenance, while extremely large controllers can be bolted in place. Each and every motor controller consists of a solid state motor controller or a contractor, overload relays so as 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 enable 3-phase power to enter the controller. The motor is wired to terminals located inside the controller. Motor control centers offer wire ways for field control and power cables.
Within a motor control center, each motor controller could be specified with several different alternatives. Some of the alternatives consist of: extra control terminal blocks, control switches, pilot lamps, separate control transformers, and many kinds 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 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 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 may be needed for cables which go through fire-rated floors and walls.
