NEN EN 1127-2 : 2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
4 Hazard identification
5 Elements of risk assessment
  5.1 General
  5.2 Determining the amount and likelihood of an occurrence
      of an explosive atmosphere
      5.2.1 General
      5.2.2 Degree of dispersion of flammable substances
      5.2.3 Concentration of flammable substances
      5.2.4 Amount of explosive atmosphere
  5.3 Determining the presence of effective ignition sources
      5.3.1 General
      5.3.2 Hot surfaces
      5.3.3 Flames and hot gases (including hot particles)
      5.3.4 Mechanically generated sparks
      5.3.5 Electrical apparatus
      5.3.6 Stray electric currents
      5.3.7 Static electricity
      5.3.8 Lightning
      5.3.9 Radio frequency (RF) electromagnetic waves from
             104 Hz to 3 x 1012 Hz (high frequency)
      5.3.10 Electromagnetic waves from 3 x 1011 Hz to 3 x
             1015 Hz
      5.3.11 Ionizing radiation
      5.3.12 Ultrasonics
      5.3.13 Adiabatic compression and shock waves
      5.3.14 Exothermic reactions, including self-ignition of
             dusts
  5.4 Estimating the possible effects-of an explosion
6 Elimination or minimization of risk
  6.1 Fundamental principles
  6.2 Avoidance or reduction of explosive atmosphere
      6.2.1 General
      6.2.2 Process parameters
      6.2.3 Design and construction of equipment, protective
             systems and components containing flammable
             substances
  6.3 Classification of hazardous atmospheric conditions
      6.3.1 General
      6.3.2 Hazardous atmospheric conditions
  6.4 Requirements for design and construction of equipment,
      protective systems and components to avoid effective
      ignition sources
      6.4.1 General
      6.4.2 Hot surfaces
      6.4.3 Flames and hot gases
      6.4.4 Mechanically generated sparks
      6.4.5 Electrical apparatus
      6.4.6 Stray electric currents and cathodic corrosion
             protection
      6.4.7 Static electricity
      6.4.8 Lightning
      6.4.9 Radio frequency (RF) electromagnetic waves from
             104 Hz to 3 x 1012 Hz
      6.4.10 Electromagnetic waves from 3 x 10[11] Hz to 3 x
             10[15] Hz
      6.4.11 Ionizing radiation
      6.4.12 Ultrasonics
      6.4.13 Adiabatic compression and shock waves
      6.4.14 Exothermic reactions, including self-ignition of
             dusts
  6.5 Requirements for design and construction of equipment,
      protective systems and components to reduce the explosion
      effects
      6.5.1 General
      6.5.2 Explosion-resistant design
      6.5.3 Explosion relief
      6.5.4 Explosion suppression
      6.5.5 Avoidance of explosion propagation (explosion
             decoupling)
      6.5.6 Special equipment for underground mining
  6.6 Provisions for emergency measures
  6.7 Principles for measuring and control systems for
      explosion prevention and protection
7 Information for use
  7.1 General
  7.2 Information on equipment, protective systems and
      components
  7.3 Information for commissioning, maintenance and repair
      to prevent explosion
  7.4 Qualifications and training
Annex A (informative) Relation between categories and
         hazardous atmospheric conditions
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other
         provisions of EU Directives
Bibliography

Defines methods for explosion prevention and protection in mining by outlining the basic concepts and methodology for the design and construction of equipment, protective systems and components.