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Home / Technical Articles / The wiring diagram and physical layout of the equipment inside the motor control centre

Introduction to motor control centre (MCC)

This article will provide a description of most important equipment and working principle of a real case motor control centre (MCC). That is an usual name for a switchboard with purpose of power supply and control of induction or DC motor(s). Besides single line and wiring diagram, practically every piece of mentioned electrical equipment will be presented in switchboard’s interior drawing, i.e. in open cubicle’s door view.

The wiring diagram and physical layout of the equipment inside the motor control centre
The wiring diagram and physical layout of the equipment inside the motor control centre

Front view with closed door will also be given, so in that way a detailed and comprehensive survey of an MCC will be achieved in both, functional and physical aspect.


Example of MCC

Low voltage motor control centre for polyelectrolyte dosing will be used as a real example for analysis. Polyelectrolyte is a chemical substance which is often used in potable and waste water treatment plants for enhancement of coagulation process.

The purpose of this process is creation of larger pollutant particles, which results in easier and more efficient removal of pollutant and other dirt from water. Polyelectrolyte is usually stored in the form of dry powder. Inside closed vessels, a solution of polyelectrolyte and service water is prepared using mixers.

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Miodrag Kokotovic

Graduated from Faculty of Electrical Engineering, within University of Belgrade, in the field of electrical power systems. Expert in electrical part of tender preparation, design, procurement, construction and commissioning of treatment plants and pumping stations, electrical power quality and energy management.

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