BS EN 437 : 2003

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Gases
  4.1 Classification
  4.2 Test gases
5 Test pressures
6 Classification of appliances
  6.1 Appliance categories
      6.1.1 General
      6.1.2 Category I
      6.1.3 Category II
      6.1.4 Category III
  6.2 Operations permitted for a change of gas or
      pressure, adjustment and regulating devices
7 Choice of test gases and test pressures
8 Marking
Annex A (normative) - Conditions for preparation of
         the test gases
Annex B (informative) - National situations
      B.1 General
      B.2 Categories listed in the body of the standard
          marketed in the different countries
      B.3 Appliance supply pressures corresponding to
          the categories given in B.1 and B.2
      B.4 Special categories marketed nationally or
          locally
      B.5 Test gases and test pressures corresponding
          to the special categories given in B.4
      B.6 Special conditions
Annex C (informative) - Guidelines for extension to
        other categories
Annex D (informative) - National situation of countries
        whose national bodies are CEN affiliate members
      D.1 General
      D.2 Categories listed in the body of the standard
          and marketed in the different countries
Bibliography

Describes the test gases, test pressures and categories of appliances relative to the use of gaseous fuels of the first, second and third families.