In which type of operation are large handlines and master streams more often used?

In firefighting, defensive operations are utilized when the fire is too extensive or conditions are too dangerous to conduct an interior attack. This approach focuses on protecting exposures, stopping the fire's spread, and allowing for controlled firefighting efforts from a safe distance.

In defensive operations, the deployment of large handlines and master streams is more common because they provide the necessary water flow and pressure to combat significant fires. These larger streams are designed to deliver high volumes of water quickly, which is essential in scenarios where the fire may threaten nearby structures or when the fire is beyond the capability of smaller lines.

While deluge operations may also utilize large streams, they are typically employed in specific scenarios such as fire protection systems that automatically trigger. Sprinkler-assisted operations rely on the suppression capabilities of sprinkler systems, and interior attacks focus on fighting the fire from within the structure, generally using smaller, more manageable hoses. The emphasis in defensive operations on minimizing risk and maximizing water flow makes the use of large handlines and master streams paramount.