For flooding, what type of isolation is set, and for fire, what type?

• A. Flooding: electrical isolation; Fire: mechanical isolation
• B. Flooding: mechanical isolation; Fire: electrical isolation
• C. Flooding: electrical isolation; Fire: electrical isolation
• D. Flooding: mechanical isolation; Fire: mechanical isolation

Answer: (A)

Focus on how isolation paths are used to stop the spread of a casualty. Flooding raises electrical hazards in the affected compartment, so the priority is to de-energize and electrically isolate that space to prevent shocks, arcing, and damage to equipment. Closing the electrical circuits and ensuring power is removed reduces the danger and helps protect personnel and systems in the flooded area.

Fire, on the other hand, is best limited by cutting off the oxygen and air supply paths. This is done by mechanically isolating the space—shutting down ventilation, closing dampers and fire doors, and isolating mechanical airflows. By stopping the air flow, the fire is starved of oxygen and smoke spreads are restrained.

So the pairing is flooding with electrical isolation and fire with mechanical isolation.