AS/NZS 61241.11:2006

Electrical apparatus for use in the presence of combustible dust Protection by intrinsic safety iD

Standards Australia

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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
6.3 Facilities for connection of external circuits
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
10.8 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

Abstract

This part of IEC 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.