What types of systems are classified as pre-engineered dry chemical systems?

The classification of pre-engineered dry chemical systems includes local application, total flooding, island hose line configurations, and various combinations of these systems.

Local application systems are designed to protect specific hazards by delivering a targeted amount of dry chemical agent to a designated area, making them highly effective for localized fire risks. Total flooding systems, on the other hand, are used to create an atmosphere within a defined space that suppresses fire by filling the entire area with the extinguishing agent.

The inclusion of island hose line systems represents another viable method for delivering dry chemical agents, particularly in scenarios where required coverage is needed for multiple potential fire hazards in an open area. This diversity in application leads to flexible fire safety strategies that can be tailored to specific risks.

Thus, option C is comprehensive in covering the various configurations of pre-engineered dry chemical systems, recognizing the importance of each system type in fire protection planning and application.