Final answer:
An assembly of enclosed sections with a common power bus, primarily containing motor control units, refers to a motor control center (MCC). It is used to centralize motor control in facilities and is analogous to interchangeable parts in an assembly line.
Step-by-step explanation:
The assembly mentioned in the question refers to a motor control center (MCC). An MCC is an assembly of one or more enclosed sections that have a common power bus, primarily containing motor control units. These units are used to centralize control of motors and are equivalent to a series of interchangeable parts and functions akin to an assembly line. Each compartment within an MCC can contain motor starters, feeders for motors, and other equipment to support the motor. The MCC provides protection, monitoring, and control of the motors, serving as a critical part of an industrial or commercial facility's power system. The concept is somewhat similar to how an integrated circuit works by housing various electronic components in a compact and efficient manner to perform complex tasks.
Motor control centers are used in industrial settings to centralize the control and protection of electric motors. They typically consist of multiple enclosed sections, each housing motor starters, circuit breakers, and other control devices.
For example, a conveyor belt in a manufacturing plant may have a motor control center that houses the motor starters for each motor along the assembly line.