1. BS EN ISO 6504-3:2007 BS 3900-D11:2007. Paints and varnishes - Determination of hiding power - Part 3: Determination of contrast ratio of light-coloured paints at a fixed spreading rate

2. BS 5345-4:1987. Code of practice for Selection, installation and maintenance of electrical apparatus for use in potentially explosive atmospheres (other than mining applications or explosive processing and manufacture)-Part 4

3. BS 5345-7:1979. Code of practice for Selection, installation and maintenance of electrical pparatus for use in potentially explosive atmospheres (other than mining applications or explosive processing and manufacture)-Part 7

4. BS 5446-2:2003. Fire detection and fire alarm devices for dwellings-Part 2: Specification for heat alarms

5. BS 5446-3:2015. Detection and alarm devices for dwellings – Part 3: Specification for fire alarm and carbon monoxide alarm systems for deaf and hard of hearing people

6. BS EN 133:2001. Respiratory protective devices - Classification

7. BS EN 136:1998. Respiratory protective devices - Full face masks - Requirements, testing, marking

8. BS EN 137:2006. Respiratory protective devices - Self-contained open-circuit compressed air breathing apparatus with full face mask - requirements, testing, marking

9. BS EN 140:1999. Respiratory protective devices - Half masks and quarter masks - Requirements, testing, marking

10. BS EN 148-1:1999. Respiratory protective devices - Threads for facepieces - Part 1: Standard thread connection