Descriptors | Fire alarms, Fire detectors, Alarm systems, Fire safety in buildings, Fire safety, Buildings, Speech transmission systems, Safety measures, Design, Installation, Maintenance, Planning, Messages, Information exchange, Circuits, Interfaces, Loudspeakers, Automatic, Defects, Computer programs, Amplifiers, Microphones, Languages, Audibility, Control equipment, Classification systems, Access, Signal devices, Visual signals, Colour, Flashing lights, Life (durability), Position, Electric power systems, Electric cables, Electric wiring systems, Interference suppression, Inspection, Commissioning, Conformity, Noise (environmental), Mathematical calculations |