EN ISO/IEC 80079-38:2016

European foreword
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
4 Requirements for equipment (machines)
  and components
5 Additional requirements for specific equipment and
  components
6 Fire protection
7 Information for use
8 Marking
Annex A (informative) - Example of an ignition
        hazard assessment for a conveyor belt
        intended for use in a coal mine
Annex B (informative) - Example of an ignition hazard
        assessment for a shearer loader intended for use
        in a potentially explosive atmosphere of a coal mine
Annex C (normative) - Ignition sources
Annex D (informative) - Guidance on potential risks
        for converter-fed motors
Annex E (normative) - Tests for surface protective
        coating for group I hand tools of EPL Mb
Bibliography
Annex ZA (informative) - Relationship between this
         European Standard and the Essential
         Requirements of EU Directive 2014/34/EU
Annex ZB (informative) - Relationship between this
         European Standard and the Essential
         Requirements of EU Directive 2006/42/EC
Annex ZC (informative) - Significant technical changes
         between this document and the previous
         edition of this European Standard

ISO/IEC 80079-38:2016 is published as a dual logo standard and specifies the explosion protection requirements for the design, construction, assessment and information for use (maintenance, repair, marking) of equipment that may be an individual item or form an assembly. This includes machinery and components for use in mines susceptible to explosive atmospheres of firedamp and/or combustible dust. The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that equipment can be operated are:- temperature -20 °C to 60 °C;- pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar);- and air with normal oxygen content, typically 21 % v/v. This part of ISO/IEC 80079 applies for equipment and components according to EPL Mb to be used in explosive atmospheres containing firedamp and/or combustible dust. For equipment and components according to EPL Ma, the requirements of this standard and of ISO 80079-36 and IEC 60079-0 apply. It is necessary to take account of external conditions to the equipment which may affect the hazard and the resultant protection measures. These measures may include ventilation, gas detection or gas drainage. This part of ISO/IEC 80079 also deals with the prevention of ignitions of explosive atmospheres caused by burning (or smouldering) of combustible material such as fabric fibres, plastic "O"-rings, rubber seals, lubricating oils or greases used in the construction of the equipment if such items could be an ignition source. For example, the mechanical failure of rotating shaft bearings can result in frictional heating that ignites its plastic cage, plastic seal or lubricating grease. Detailed requirements and test procedures for the fire protection of conveyer belts are not part of this part of ISO/IEC 80079. Keywords: explosive atmospheres in underground mines, combustible dust