This European Standard specifies the requirements, test methods and performance criteria for fire alarm sounders in a fixed installation intended to signal an audible warning of fire detection and fire alarm systems and the occupants of a building. It is intended to cover only those devices which derive their operating power by means of a physical electrical connection to external source such as a fire alarm system. This standard is also intended to cover voice sounders by the application of specific requirements, tests and performance criteria. This standard specifies fire alarm sounders for two types of application environment, Type A for indoor use and Type B for outdoor use. This standard does not cover: a) loudspeaker type devices primarily intended for emitting emergency voice messages that are generated from an external audio source; b) supervisory sounders, for example, within the control and indicating equipment.