This European Standard specifies the basic method and requirements for design, construction, testing and marking of non-electrical equipment intended for use in potentially explosive atmospheres in air of gas, vapour, mist and dusts. Such atmospheres can also exist inside the equipment. In addition, the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment's internal operating pressure, and/or temperature. This European Standard is valid for atmospheres having pressures ranging from 0,8 bar to 1,1 bar and temperatures ranging from - 20 °C to + 60 °C., i.e. equipment built to this European Standard will be satisfactory to any service conditions within this range unless otherwise specified. NOTE 1 The requirements of this European Standard can also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above. In this case however, the ignition hazard assessment, ignition protection provided, additional testing (if necessary), manufacturer's technical documentation and instructions to the user, should clearly demonstrate and indicate the equipment's suitability for the conditions it may encounter. It should also be recognized that changes in temperature and pressure can have a significant influence on ignitability. This European Standard does not cover additional marking for equipment intended for use outside the scope of its validity such as an oxygen-enriched atmosphere. This European Standard is also applicable for the design, construction, testing and marking of components, protective systems, devices and assemblies of these products which have possible ignition sources and are intended for use in potentially explosive atmospheres. It specifies the requirements for the design and construction of equipment, intended for use in potentially explosive atmospheres in conformity with all categories of Group I and II. This European Standard can be supplemented by European Standards concerning the specific types of ignition protection. NOTE 2 These are given below: EN 13463-2, Non-electrical equipment for use in potentially explosive atmospheres - Protection by flow restricting enclosure (fr) EN 13463-3, Non-electrical equipment for use in potentially explosive atmospheres - Protection by flameproof enclosure (d) EN 13463-5, Non-electrical equipment for use in potentially explosive atmospheres - Protection by constructional safety (c) EN 13463-6, Non-electrical equipment for use in potentially explosive atmospheres - Protection by control of ignition sources (b) EN 60079-2, Electrical apparatus for explosive gas atmospheres - Pressurised enclosures "p" (Protection by pressurization described in EN 60079-2 can also be used for non-electrical equipment.) EN 13463-8, Non-electrical equipment for use in potentially explosive atmospheres - Protection by liquid immersion (k) EN 50303, Group I, category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust. NOTE 3 Equipment designed and constructed in accordance with this European Standard for a particular category may be used in areas requiring a category with a higher level of safety by the application of additional explosion prevention and/or protection methods. Such applications are not covered in this standard. NOTE 4 Such explosion prevention and/or protection measures include for example inerting, suppression, venting or containment as described in EN 1127-1, for Group II equipment or for example by dilution, drainage, monitoring and shutdown as described in EN 1127-2 for Group I equipment. Such explosion protection methods are outside the scope of this European Standard. NOTE 5 Although the normal atmospheric conditions above give a temperature range for the atmosphere of - 20 °C to + 60 °C the ambient temperature range for the equipment is - 20 °C to + 40 °C unless otherwise specified and marked, see 6.2.2.