What term is used in NFPA 72 to describe temporary loss of system function requiring notification?

• A. Impairments
• B. Faults
• C. Troubles
• D. Disruptions

Answer: (A)

In NFPA 72, impairment is used to describe a temporary loss of a system function that requires notification to the appropriate authorities. This term covers situations where a device or subsystem stops operating for a short period and must be reported and documented so the situation can be managed and restored. It’s distinct from a fault, which implies a more persistent hardware failure; from a trouble, which signals a monitored condition needing service but may not stop system operation; and from terms that aren’t used in this context. When a function is temporarily unavailable, classifying it as an impairment ensures proper notification and tracking until normal operation is restored.