Alarm/alert/evacuation systems areactivated immediately by a

Generally only senior staff (managers) are allowed to operate alarms and other forms of alert/evacua- tion systems. This is because of the costs which may be involved if the fire service is called out wrongly and the damage which may occur if staff and/or customers panic.
In the case of a fire the normal alarm is a form of siren or bell. For other emergencies say a serious injury,an audible warning from a speaker announcement system (often called a tannoy) may be used. In a garage these are usually operated from the service department office.