It was thought that the fire alarm had been set off as a prank.
Fire alarms have been installed in the building.
The fire alarm went off when I was making a coffee.
An electrical fault had set off the fire alarm.
»If the fire alarm sounds, leave the building immediately.
Англо-русский строительный словарь. — М.: Русский Язык.С.Н.Корчемкина, С.К.Кашкина, С.В.Курбатова.1995.
1. пожарная тревога
2. автоматический пожарный сигнал
1) пожежна тривога
2) пожежна сигналізація
пожежна тривога; (автоматична) пожежна сигналізація