Which time interval is used for notifying entities within the detection of a failure lasting 30 minutes or longer?

• A. 30 minutes
• B. 45 minutes
• C. 90 minutes
• D. 60 minutes

Answer: (D)

When a disturbance is detected that is expected to last 30 minutes or longer, the standard requires notifying the relevant entities within sixty minutes of detection. This one-hour window ensures timely awareness and coordination while avoiding premature alerts for events that may still be verifying their duration. The clock starts at the moment the event is detected and confirmed to meet or exceed 30 minutes; notification should be completed by one hour after that moment. Shorter intervals (like 30 or 45 minutes) would push the threshold too quickly and risk premature or unnecessary notifications, while a longer interval (90 minutes) could delay critical coordination. For example, if detection occurs at 10:10 and the event is expected to last at least 30 minutes, notification should be sent by 11:10.