Florida Unlimited Electrical (1-57) Practice Exam

The correct choice specifies that a fire alarm electrical backup system must have the capacity to operate in a quiescent (non-alarm) condition for 24 hours. This requirement is crucial for ensuring that the fire alarm system remains functional during a power outage, enabling it to continuously monitor for any signs of fire even when electrical supply is interrupted.

The rationale for a 24-hour capacity is based on safety standards and regulations, which are designed to provide a reasonable assurance that the system can maintain its operational readiness for an extended period. This duration allows for potential fluctuations in power availability and ensures that the alarm will still be operational in the event of emergencies that may last longer than shorter time frames provided by the other options.

The other options suggest shorter or longer durations, neither of which align with the established requirement for backup battery capacity in fire alarm systems. A backup capacity longer than 24 hours would not be practical or commonly required in most standard applications, while a backup capacity shorter than 24 hours would not meet safety standards.