What is the role of interlocks within the NFPA 2001 control sequence?

• A. To increase ventilation automatically
• B. To shut down the system permanently
• C. To coordinate release timing and interlocks to prevent unintended release
• D. To monitor humidity

Answer: (C)

Interlocks in an NFPA 2001 control sequence are all about safe, coordinated action. They ensure that the clean agent release can occur only when the system has met all required conditions and inputs, and they prevent an unintended discharge by tying together the sequence of events. In practice, interlocks coordinate signals from detectors, manual release inputs, alarms, power supply status, and any necessary timing or safeguards so that the release command is issued in the correct order and only under legitimate conditions. This means a release won’t happen if a fault is detected, if maintenance is ongoing, or if the required verification steps aren’t satisfied, thereby preventing accidental or premature discharge. Other options describe actions not governed by these interlocks—such as increasing ventilation automatically, shutting the system down permanently, or monitoring humidity—which are not the purpose of the release control interlocks.