This European Standard defines the constructional and operational characteristics, the safety requirements, test methods and the marking of regulators and automatic change-over devices having a maximum regulated pressure of 4 bar, with a maximum capacity of 150 kg/h, for use with butane, propane and their mixtures in the vapour phase. This European Standard also applies to the safety devices which are included within regulating devices covered by this standard. The characteristics of these safety devices are given in Annexes A and B. This European Standard also includes the requirements for: adaptors for connecting to self closing valves; auxiliary safety devices. For the purpose of this European Standard: regulators and automatic change-over devices are referred to as "regulating devices"; regulators, automatic change-over devices and adaptors are referred to as "devices". The requirements apply to devices used in locations where the temperature likely to be reached during use is between -20 °C and +50 °C. Additional requirements for devices to be used at temperatures below -20 °C are given in Annex C. Additional requirements for regulating devices intended to be used in caravans, motor caravans and freshwater boats are given in Annex D. Additional requirements for regulating devices intended to be used in seawater boats are given in Annex M. For specific use in caravans motor caravans and boats (freshwater and seawater), the automatic change over device function may also be carried out by an assembly of regulators, forming an "automatic change over device system" as defined in 3. For installation rules of devices and their possible associated safety devices, reference should be made to national regulations in force in the member countries. All connections and the countries in which they are used are given in Annexes G and H. This European Standard defines only specific connections which are not defined in other standards (e. g. EN 15202 for cylinder valve connections).