How do fire department connections (FDC) work in conjunction with sprinkler systems?

Fire department connections (FDC) play a crucial role in the overall effectiveness of sprinkler systems during fire emergencies. These connections are strategically installed to allow firefighters to pump water directly into the sprinkler system. When a fire breaks out, the existing water supply in the sprinkler system may not be sufficient to adequately combat the fire, especially in larger structures or in cases of severe fire incidents.

By providing an additional water supply, FDCs enhance the operational capacity of the sprinkler system. Firefighters can connect their engines to the FDCs, allowing them to boost the water flow and increase the pressure within the sprinkler system. This ensures that more water is available to suppress the fire, ultimately aiding in protecting lives and property.

The other options, such as reducing pressure, acting as a water reservoir, or being used solely for system testing, do not accurately capture the primary function and importance of FDCs in the context of an active fire response.