ISA 61241-11 : 2006

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

Describes requirements for the construction and testing of intrinsically safe apparatus intended for use in an explosive dust atmosphere and for associated apparatus that is intended for connection to intrinsically safe circuits which enter such atmospheres.