BS EN 54-4. Fire detection and fire alarm systems. Part 4. Power supply equipment|Fire alarms, Alarm systems, Fire detectors, Fire safety in buildings, Fire safety, Warning devices, Control equipment, Signal devices, Performance, Design, Defects, Acoustic signals, Visual signals, Marking, Electric power systems, Control systems, Technical documents, Type testing, Specimen preparation, Electrical testing, Performance testing, Environmental testing, Voltage, Electrical equipment, Electrostatics, Electric discharges, Transient voltages, Cold tests, Damp-heat tests, Impact testing, Vibration, Vibration testing, Burst tests, Endurance testing, Testing conditions