If protected hazards are heated, the power/fuel supply to heaters is required to shut down automatically when actuating the extinguishing system.

• A. Shut down automatically
• B. Continue to run
• C. Shut down manually
• D. No requirement

Answer: (A)

When a fixed extinguishing system is actuated, all potential ignition sources in the protected area should be eliminated. Heaters are such sources because they provide ongoing heat or flame risk that could reignite materials even as the agent is being released. Automatically cutting off the power or fuel to those heaters as soon as the system discharges removes this extra heat input, allowing the extinguishing agent to do its job effectively and reducing the chance of re‑ignition. Continuing to run or requiring manual shutoff would either defeat the suppression effort or delay safety action, so automatic shutdown is the correct and safest approach.