"This part of IEC 60079 specifies the general requirements for construction@ testing and marking of electrical equipment and Ex components intended for use in explosive atmospheres. 1DV.1 DR Modification of Clause 1 first paragraph to replace with the following: 1DV.1.1 This standard specifies the general requirements for construction@ testing and marking of electrical equipment and Ex components to use in explosive atmospheres. Explosive atmospheres are identified by the National Electrical Code?@ NFPA 70 as hazardous (classified) locations and include the following specified locations. ? Class I@ Zone 0; ? Class I@ Zone 1; ? Class I@ Zone 2; ? Zone 20; ? Zone 21; and ? Zone 22. Unless modified by one of the parts in the IEC 60079 series@ electrical apparatus complying with this standard is intended for use in hazardous areas in which explosive gas atmospheres@ caused by mixtures of air and gases@ vapours or mists@ exist under normal atmospheric conditions of ? temperature ?C20 ??to +60 ?? ? pressure 80 kPa (0@8 bar) to 110 kPa (1@1 bar); and ? air with normal oxygen content@ typically 21 % v/v. The application of electrical apparatus in atmospheric conditions outside this range may need special consideration. NOTE 1 Although the normal atmospheric conditions above give a temperature range for the atmosphere of -20??to +60?? the normal ambient temperature range for the equipment is -20??to +40?? unless otherwise specified and marked. See 5.1.1. NOTE 2 In designing equipment for operation in explosive atmospheres under conditions other than the atmospheric conditions given above@ this standard may be used for guidance. However@ additional testing related specifically to the intended conditions of use is recommended. This is particularly important when the types of protection ??flameproof enclosure ""d""' (IEC 60079-1) and ??intrinsic safety ""i""' (IEC 60079-11 or IEC 61241-11) are applied. 1DV.2 DR Modification of Clause 1 Note 2 as follows: 1DV.2.1 Delete ""(IEC 60079-1) "" and ""(IEC 60079-11 or IEC 61241-11)"". NOTE 3 Requirements given in this standard result from an ignition hazard assessment made on electrical equipment. The ignition sources taken into account are those found associated with this type of equipment@ such as hot surfaces@ mechanically generated sparks@ thermite reactions@ electrical arcing and static electric discharge in normal industrial environments. NOTE 4 It is acknowledged that@ with developments in technology@ it may be possible to achieve the objectives of the IEC 60079 series of standards in respect of explosion prevention by methods that are not yet fully defined. Where a manufacturer wishes to take advantage of such developments@ this International Standard@ as well as other standards in the IEC 60079 series@ may be applied in part. It is intended that the manufacturer prepare documentation that clearly defines how the IEC 60079 series of standards has been applied@ together with a full explanation of the additional techniques employed. The designation ""Ex s"" has been reserved to indicate a type of protection that is not defined by the IEC 60079 series of standards@ but may be referenced in national requirements. 1DV.3 DR Delete Clause 1 Note 4. 1DV.3.1 This Note does not apply. NOTE 5 Where an explosive gas atmosphere and a combustible dust atmosphere are@ or may be@ present at the same time@ the simultaneous presence of both should be considered and may require additional protective measures. This standard does not specify requirements for safety@ other than those directly related to the explosion risk. Ignition sources like adiabatic compression@ shock waves@ exothermic chemical reaction@ self ignition of dust@ naked flames and hot gases/liquids@ are not addressed by this standard. NOTE 6 Such equipment should be subjected to a hazard analysis that identifies and lists all of the potential sources of ignition by the electrical equipment and the measures to be applied to prevent them becoming effective."