1 Scope
2 Normative references
3 Terms and definitions
4 Grouping and classification of intrinsically
   safe apparatus and associated apparatus
5 Levels of protection and ignition compliance
   requirements of electrical apparatus
   5.1 General
   5.2 Level of protection 'ia'
   5.3 Level of protection 'ib'
   5.4 Level of protection 'ic'
   5.5 Spark ignition compliance
   5.6 Thermal ignition compliance
   5.7 Simple apparatus
6 Apparatus construction
   6.1 Enclosures
   6.2 Facilities for connection of external circuits
   6.3 Separation distances
   6.4 Protection against polarity reversal
   6.5 Earth conductors, connections and terminals
   6.6 Encapsulation
7 Components on which intrinsic safety depends
   7.1 Rating of components
   7.2 Connectors for internal connections, plug-in cards
        and components
   7.3 Fuses
   7.4 Primary and secondary cells and batteries
   7.5 Semiconductors
   7.6 Failure of components, connections and separations
   7.7 Piezo-electric devices
   7.8 Electrochemical cells for the detection of gases
8 Infallible components, infallible assemblies of
   components and infallible connections on which
   intrinsic safety depends
   8.1 Mains transformers
   8.2 Transformers other than mains transformers
   8.3 Infallible windings
   8.4 Current-limiting resistors
   8.5 Blocking capacitors
   8.6 Shunt safety assemblies
   8.7 Wiring, printed circuit board tracks, and
        connections
   8.8 Galvanically separating components
9 Diode safety barriers
   9.1 General
   9.2 Construction
10 Type verifications and type tests
   10.1 Spark ignition test
   10.2 Temperature tests
   10.3 Dielectric strength tests
   10.4 Determination of parameters of loosely
        specified components
   10.5 Tests for cells and batteries
   10.6 Mechanical tests
   10.7 Tests for apparatus containing piezoelectric
        devices
   10.8 Type tests for diode safety barriers and safety
        shunts
   10.9 Cable pull test
   10.10 Transformer tests
11 Routine verifications and tests
   11.1 Routine tests for diode safety barriers
   11.2 Routine tests for infallible transformers
12 Marking
   12.1 General
   12.2 Marking of connection facilities
   12.3 Warning markings
   12.4 Examples of marking
13 Documentation
Annex A (normative) Assessment of intrinsically
         safe circuits
Annex B (normative) Spark test apparatus for
         intrinsically safe circuits
Annex C (informative) Measurement of creepage
         distances, clearances and separation
         distances through casting compound and
         through solid insulation
Annex D (informative) Encapsulation
Annex E (informative) Transient energy test
Annex F (normative) Alternative separation
         distances for assembled printed circuit
         boards and separation of components
Annex ZA (normative) Normative references to
         international publications with their
         corresponding European publications
Annex ZZ (informative) Coverage of Essential
         Requirements of EC Directives
Bibliography