1. BS EN 54-21:2006. Fire detection and fire alarm systems - Part 21: Alarm transmission and fault warning routing equipment

2. BS EN 54-22:2015. Fire detection and fire alarm systems - Part 22: Resettable line-type heat detectors

3. BS EN 54-23:2010. Fire detection and fire alarm systems - Part 23: Fire alarm devices - Visual alarm devices

4. BS EN 54-24:2008. Fire detection and fire alarm systems - Part 24: Components of voice alarm systems - Loudspeakers

5. BS EN 54-25:2008. Fire detection and fire alarm systems - Part 25: Components using radio links

6. BS EN 54-26:2015. Fire detection and fire alarm systems - Part 26: Carbon monoxide detectors - Point detectors

7. BS EN 54-27:2015. Fire detection and fire alarm systems - Part 27: Duct smoke detectors

8. BS EN 54-28:2016. Fire detection and fire alarm systems - Part 28: Non-resettabl e li ne-type heat detectors

9. BS EN 54-29:2015. Fire detection and fire alarm systems - Part 29: Multi-sensor fire detectors - Point detectors using a combination of smoke and heat sensors

10. BS EN 54-3:2014. Fire detection and fire alarm systems - Part 3: Fire alarm devices - Sounders