What is the role of a fire department connection (FDC) in a standpipe system?

The fire department connection (FDC) plays a crucial role in a standpipe system by allowing firefighters to connect hoses directly to the system to supplement the available water supply during a fire. This is particularly important in multi-story buildings or large structures where the existing water supply may not be sufficient to combat a fire effectively. By connecting to the FDC, firefighters can supply additional water from their engines, ensuring that the standpipe system can deliver the necessary flow and pressure needed to effectively fight the fire and protect occupants and property.

In this context, the other options do not accurately reflect the primary purpose of the FDC. While the FDC is crucial for enhancing the water supply, it does not serve as a source for fire sprinklers, provide emergency lighting, or function as a water pressure regulator.