1. BS 5990:2006. Specification for direct gas-fired forced convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial space heating – Safety and performance requirements

2. BS 5991:-2006. Specification for indirect gas fired forced convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial space heating – Safety and performance requirements

3. BS 5992-4:1983 IEC 255-14:1981. Electrical relays - Part 4: Specification for contact loads of preferred values used in endurance tests for electrical relay contacts

4. BS 5992-5:1983 IEC 255-15:1981. Electrical relays - Part 5: Specification for test equipment used in endurance tests for electrical relay contacts

5. BS 5992-6:1984. Electrical relays - Part 6: Specification for the basic modules for the dimensions of general purpose all-or-nothing relays

6. BS 5449:1990. Specification for Forced circulation hot water central heating systems for domestic premises

7. BS 5472:1977 EN 50005. Specification for Low voltage switchgear and controlgear for industrial use - Terminal marking and distinctive number - General rules

8. BS 5481:1977. Specification for Unplasticized PVC pipe and fittings for gravity sewers

9. BS 5482-1:2005. Code of Practice for domestic butane- and propane-gas-burning installations - Part 1: Installations at permanent dwellings, residential park homes and commercial premises, with installation pipework sizes not

10. BS 5486-11:1989. Low-voltage switchgear and controlgear assemblies - Part 11: Specification for particular requirements of fuseboards