This European Standard specifies requirements, methods of test and performance criteria for voice alarm control and indicating equipment for use in fire detection and fire alarm systems installed in buildings, where the alarm signal is in the form of tone(s) or voice message(s), or both. It also provides for the evaluation of conformity of the equipment to the requirements of this European Standard. NOTE The overall requirements of a voice alarm system, especially concerning audibility and intelligibility, are not covered in this part of EN 54. The manufacturer should consider requirements of an overall system that may affect the equipment design. Such system requirements may be specified in another part of EN 54, in national legislation, codes and standards or in contractual documents.