What does switchgear control?

Switchgear primarily serves the purpose of controlling, protecting, and isolating electrical equipment in an electrical power system. It includes a combination of electrical disconnect switches, fuses, or circuit breakers that allow operators to manage the distribution of electricity safely and efficiently.

The control function involves regulating the flow of electricity through various components to ensure a reliable power supply. Protection is crucial as it safeguards equipment and systems from overloads, short circuits, and faults, preventing damage and enhancing safety. Isolation is necessary for maintenance and repair work, ensuring that personnel can safely access certain equipment without risk of electrical shock.

This multifaceted role is essential for managing power systems in various contexts, including industrial plants, substations, and commercial buildings, making option C the most comprehensive and accurate description of what switchgear controls. The other options focus on narrower aspects or specific contexts that do not encapsulate the entire function of switchgear.