The emergency generator is required to operate for at least six hours. How long should this requirement apply?

The emergency generator is required to operate for at least six hours. How long should this requirement apply?

• A. 2 hours
• B. 4 hours
• C. 8 hours
• D. 6 hours

Answer: (D)

The main concept is the minimum operating duration for emergency power. When a requirement says the generator must operate for at least six hours, it establishes six hours as the minimum the system must be able to sustain. So the duration the requirement applies to is six hours—the generator must be capable of running for six hours or longer under the expected load. Shorter durations, like two or four hours, don’t meet the minimum. A longer duration, such as eight hours, would also satisfy the requirement because it exceeds the minimum.

The main concept is the minimum operating duration for emergency power. When a requirement says the generator must operate for at least six hours, it establishes six hours as the minimum the system must be able to sustain. So the duration the requirement applies to is six hours—the generator must be capable of running for six hours or longer under the expected load. Shorter durations, like two or four hours, don’t meet the minimum. A longer duration, such as eight hours, would also satisfy the requirement because it exceeds the minimum.