09/30198043 DC : 0

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Risk assessment
  4.1 General
  4.2 Identification of explosion hazards
       4.2.1 General
       4.2.2 Combustion properties
       4.2.3 Explosion behaviour
       4.2.4 Likelihood of occurrence of a hazardous
              explosive atmosphere
  4.3 Identification of ignition hazards
       4.3.1 General
       4.3.2 Ignition properties
       4.3.3 Likelihood of occurrence of potential
              ignition sources
  4.4 Estimation of the possible effects of an explosion
5 Possible ignition sources
  5.1 Hot surfaces
  5.2 Flames and hot gases (including hot particles)
  5.3 Mechanically generated sparks
  5.4 Electrical apparatus
  5.5 Stray electric currents, cathodic corrosion
       protection
  5.6 Static electricity
  5.7 Lightning
  5.8 Radio frequency (RF) electromagnetic waves from
       10[4] Hz to 3 x 10[12] Hz
  5.9 Electromagnetic waves from 3 x 10[11] Hz to 3' x
       10[15] Hz
  5.10 Ionizing radiation
  5.11 Ultrasonics
  5.12 Adiabatic compression and shock waves
  5.13 Exothermic reactions, including self-ignition of
       dusts
6 Risk reduction
  6.1 Fundamental principles
  6.2 Avoidance or reduction of the amount of explosive
       atmosphere
       6.2.1 General
       6.2.2 Process parameters
       6.2.3 Design and construction of equipment, protective
              systems and components
  6.3 Classification of hazardous areas
  6.4 Requirements for the design and construction of
       equipment, protective systems and components by
       avoidance of 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
              10[4] Hz to 3 x 10[12] 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 the 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 Prevention of explosion propagation (explosion
              decoupling)
  6.6 Provisions for emergency measures
  6.7 Principles of 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) - Information for the use of tools
        in potentially explosive atmospheres
Annex B (informative) - Significant technical changes between
        this document and the previous edition of this
        European Standard
Annex ZA (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 94/9/EC
Annex ZB (informative) - Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2006/42/EC
Bibliography

BS EN 1127-1