Which of the following is NOT a component part of a distribution system?

The correct choice indicates that switchgear is not considered a component part of a distribution system. In a distribution system, the essential components typically include the distribution substation, feeder circuits, and protective equipment.

A distribution substation plays a crucial role by transforming high-voltage electricity from transmission lines to a lower voltage suitable for distribution to consumers. Feeder circuits are responsible for carrying the electric power from the substation to various distribution points. Protective equipment, such as circuit breakers and fuses, ensures the safety and reliability of the system by providing protection against faults and overloads.

Switchgear, while important in electrical systems for controlling and protecting equipment, is more commonly associated with transmission systems or specific installations rather than the distribution network itself. It serves as an interface in a broader electrical system but does not specifically define the core structure of a distribution system. Thus, this is why switchgear is identified as not being a fundamental part of the distribution component set.