In a two-stage alarm, what happens when the system reaches the full alarm stage?

• A. The occupants are notified and NACs are activated.
• B. The system shuts down completely.
• C. Only security staff are notified.
• D. The detectors enter a maintenance mode.

Answer: (A)

When a two-stage alarm escalates to full alarm, the building-wide warning is activated for everyone inside. Occupants are notified and the notification appliance circuits (NACs) drive the audible and visual alerts—such as horns, bells, strobes, and any public-address messages—so people can evacuate or take appropriate action. This stage is all about delivering a clear, immediate alert to occupants, not about shutting the system down or limiting who is notified. The other options don’t fit because full alarm is not a shutdown, it’s not limited to security staff, and it isn’t a maintenance mode for detectors.