Which of the following is a component of a central clock system?

A central clock system is designed to synchronize time across various locations within a facility, often involving a network of interconnected components. Among these components, disconnects serve an essential role. They provide the necessary capability to isolate parts of the system for maintenance or troubleshooting, ensuring safety and functionality.

This isolation is crucial for a centralized system that governs timing across many devices, as any maintenance performed on one unit should not disrupt the overall functionality for others. Disconnects help facilitate this by allowing specific sections of the clock system to be powered down without affecting the entire network, thus maintaining the integrity of the synchronization process.

While the other options—generators, lighting, and panelboards—play significant roles in electrical systems, they are not specifically integral to the operation or functionality of a central clock system. Generators provide power, lighting pertains to illumination, and panelboards are used for distributing electrical power but do not directly contribute to the timekeeping or synchronization function of a clock system. Therefore, disconnects are the most relevant and necessary component specifically within the context of a central clock system.