Before revision: Fire alarm tests are often done outside normal business hours so as to minimize disruption of building functions; in schools, they are often done when students and staff are not around or during the holidays where specialist fire alarm engineers test alarms in the building for repair if needed , although such tests can be conducted during school hours with students and staff present, with announcements made from the main school office that an alarm test was going to take place .
After revision: Fire alarm tests are often done outside normal business hours so as to minimize disruption of building functions; in schools, they are often done when students and staff are not around or during the holidays where specialist fire alarm engineers test alarms in the building for repair if needed .