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