1 Scope
2 References
3 Terms and definitions
4 Grouping and classification of intrinsically safe
apparatus and associated apparatus
5 Levels of protection of electrical apparatus
6 Apparatus construction
6.1 Enclosures
6.2 Temperatures of apparatus
6.2.1 General
6.2.2 Supplementary requirements for apparatus
immersed in dust
6.2.3 Standardized dust immersion temperature test
6.2.6 Unenclosed circuits
6.3 Facilities for connection of external circuits
6.3.1 Terminals
6.3.2 Plugs and sockets
6.3.3 Determination of maximum external inductance
to resistance ratio (Lo/Ro) for resistance
limited power source
6.3.4 Permanently connected cables
6.4 Separation distances
6.5 Protection against polarity reversal
6.6 Earth conductors, connections and terminals
6.7 Encapsulation used for exclusion of explosive dust
atmosphere
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 and connections
7.7 Piezo-electric devices
8 Infallible components, infallible assemblies of components
and infallible connections
9 Diode safety barriers
10 Type verifications, assessments and type tests
10.1 Spark ignition assessment
10.2 Temperature tests
10.3 Voltage tests
10.5 Determination of parameters of loosely specified
components
10.6 Tests for cells and batteries
10.7 Mechanical test
10.7.1 Casting compound
10.7.2 Partitions
10.8 Tests for apparatus containing piezoelectric devices
10.9 Type tests for diode safety barriers and safety shunts
10.10 Cable pull test
11 Routine verifications and tests
12 Marking
12.1 General
12.2 Marking of connection facilities
12.3 Control drawings
13 Documentation
Annex A (normative) Spark test apparatus for intrinsically
safe circuits
Annex B (informative) Measurement of creepage distances,
clearances and separation distances
through casting compound and through
solid insulation
Annex C (normative) Encapsulation
Annex D (informative) US national deviations