What is a common application of a wiring diagram?

A wiring diagram is primarily used for troubleshooting electrical systems because it provides a clear visual representation of the connections and components within the system. This makes it easier to follow the flow of electricity and identify where problems may arise, such as breaks in the circuit or improper connections. By analyzing a wiring diagram, technicians can efficiently diagnose issues and develop effective solutions, which is crucial for ensuring the safety and functionality of electrical installations.

The other options serve different purposes that are not the primary function of a wiring diagram. For example, while showing the passage of time in project phases may be relevant in project management, it does not pertain to the specifics of electrical wiring. Similarly, indicating materials needed for construction focuses more on the planning phase and listing items rather than the schematic representation of electrical systems. Lastly, displaying color codes for wires is more about wire identification than the comprehensive mapping of electrical connections, which wiring diagrams aim to provide. Hence, these options do not align with the key role that wiring diagrams play in troubleshooting.