EN 61241-11:2006

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Grouping and classification of intrinsically safe apparatus
   and associated apparatus
5 Categories of electrical apparatus
6 Apparatus construction
   6.1 Enclosures
   6.2 Temperatures of apparatus immersed in dust
         6.2.1 General
         6.2.2 Apparatus and component temperature
         6.2.3 Standardized dust immersion temperature test
         6.2.4 Wiring within apparatus
         6.2.5 Printed circuit wiring
         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 potentially
         explosive 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
   10.4 Small component ignition test
   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
13 Documentation
Annex A (normative) See Annex B of IEC 60079-11
Annex B (informative) See Annex C of IEC 60079-11
Annex C (normative) See Annex D of IEC 60079-11
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications
Annex ZZ (informative) Coverage of Essential Requirements
         of EC Directives

This part of EN 61241 specifies requirements for the construction and testing of intrinsically safe apparatus intended for use in potentially explosive dust cloud or dust layer environments and for associated apparatus that is intended for connection to intrinsically safe circuits which enter such environments.