What is the purpose of start/stop interlocks with building systems?

• A. To coordinate building lighting schedules.
• B. To coordinate operation and prevent false starts, and ensure alarms and interlocks function safely.
• C. To disable alarms during testing.
• D. To prevent all starts entirely.

Answer: (B)

Start/stop interlocks with building systems are there to make the fire protection equipment operate only when everything is ready and to handle signals from other building controls in a safe, coordinated way. They prevent false starts by filtering out accidental or conflicting commands, and they ensure that alarms and interlocks respond in a predictable, safe manner when the system is activated or deactivated. In practice, a start command won’t energize the fire pump if prerequisite conditions aren’t met—such as power availability, proper valve positions, or pressure conditions—and a stop will occur in a controlled way that doesn’t leave the system in an unsafe state. This coordination helps avoid nuisance or unsafe starts and ensures that all safety-related signals and interlocks work together reliably.

Options about coordinating lighting schedules, disabling alarms during testing, or preventing all starts do not fit the purpose. Lighting schedules aren’t part of fire-pump safety logic, disabling alarms during testing would defeat safety protections, and preventing all starts would defeat the purpose of having a fire pump operation when needed.