Which statement describes the lamp's battery sufficiency for rated duration?

Which statement describes the lamp's battery sufficiency for rated duration?

• A. Simulation of failure for set periods of time eg 1H. 2h
• B. The lamp's battery is sufficient to run the lamp for the rated duration
• C. Provide a facility for normal power to be restored
• D. Method of checking lamp will strike correctly on power failure

Answer: (B)

The important idea here is verifying that the emergency lamp can run on its battery for the full time it’s required to operate without mains power. That means the battery must have enough stored energy to supply the lamp’s load for the entire rated duration (such as 1 hour, 2 hours, etc.) while maintaining the required light output. To confirm this, you perform a discharge test where the lamp is powered from its battery alone for the rated period and ensure it stays on and meets the output specs throughout. This directly demonstrates that the battery is capable of sustaining operation for the time specified by the rating. The other options describe different checks—simulating faults, restoring normal power, or verifying ignition on power failure—which are related to other aspects of the system but don’t directly prove battery sufficiency for the rated duration.

The important idea here is verifying that the emergency lamp can run on its battery for the full time it’s required to operate without mains power. That means the battery must have enough stored energy to supply the lamp’s load for the entire rated duration (such as 1 hour, 2 hours, etc.) while maintaining the required light output. To confirm this, you perform a discharge test where the lamp is powered from its battery alone for the rated period and ensure it stays on and meets the output specs throughout. This directly demonstrates that the battery is capable of sustaining operation for the time specified by the rating. The other options describe different checks—simulating faults, restoring normal power, or verifying ignition on power failure—which are related to other aspects of the system but don’t directly prove battery sufficiency for the rated duration.