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  • AS/NZS 60079.11:2000

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Electrical apparatus for explosive gas atmospheres Intrinsic safety 'i'

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  30-06-2017

    Language(s): 

    Published date:  25-07-2000

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS/NZS 60079.11:2000 ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES - INTRINSIC SAFETY `I'
    4 - PREFACE
    5 - CONTENTS
    7 - 1 Scope
    8 - 2 Normative references
    9 - 3 Definitions
    9 - 3.1 intrinsically safe circuit
    9 - 3.2 electrical apparatus
    9 - 3.3 intrinsically safe apparatus
    9 - 3.4 associated apparatus
    10 - 3.5 normal operation
    10 - 3.6 fault
    10 - 3.7 countable fault
    10 - 3.8 non-countable fault
    10 - 3.9 infallible component or infallible assembly of components
    10 - 3.10 infallible separation or insulation
    10 - 3.11 simple apparatus
    10 - 3.12 internal wiring
    10 - 3.13 minimum igniting current (MIC)
    10 - 3.14 minimum igniting voltage
    11 - 3.15 maximum r.m.s. a.c. or d.c. voltage (Um)
    11 - 3.16 maximum input voltage (Ui)
    11 - 3.17 maximum output voltage (Uo)
    11 - 3.18 maximum input current (Ii)
    11 - 3.19 maximum output current (Io)
    11 - 3.20 maximum input power (Pi)
    11 - 3.21 maximum output power (Po)
    11 - 3.22 maximum external capacitance (Co)
    11 - 3.23 maximum internal capacitance (Ci)
    11 - 3.24 maximum external inductance (Lo)
    12 - 3.25 maximum internal inductance (Li)
    12 - 3.26 maximum external inductance to resistance ratio (Lo/Ro)
    12 - 3.27 maximum internal inductance to resistance ratio (Li/Ri)
    12 - 3.28 clearance
    12 - 3.29 distance through casting compound
    12 - 3.30 distance through solid insulation
    12 - 3.31 creepage distance in air
    12 - 3.32 creepage distance under coating
    12 - 3.33 fuse rating (In)
    12 - 3.34 sealed gas tight cell or battery
    12 - 3.35 sealed valve-regulated cell or battery
    13 - 3.36 diode safety barrier
    13 - 4 Grouping and classification of intrinsically safe apparatus and associated apparatus
    13 - 5 Categories of electrical apparatus
    13 - 5.1 General
    13 - 5.2 Category ‘ia’
    14 - 5.3 Category ‘ib’
    14 - 5.4 Simple apparatus
    15 - 6 Apparatus construction
    15 - 6.1 Enclosures
    15 - 6.2 Wiring and small component temperatures
    15 - 6.2.1 Dust layers on Group I equipment
    15 - 6.2.2 Wiring within apparatus
    16 - 6.2.3 Printed circuit wiring
    17 - 6.2.4 Small components
    18 - 6.3 Facilities for connection of external circuits
    18 - 6.3.1 Terminals
    19 - 6.3.2 Plugs and sockets
    20 - 6.3.3 Determination of maximum external inductance to resistance ratio (Lo/Ro) for resistance limited power source
    21 - 6.3.4 Permanently connected cable
    21 - 6.4 Separation distances
    21 - 6.4.1 Separation of conductive parts
    22 - 6.4.2 Voltage between conductive parts
    23 - 6.4.3 Clearance
    23 - 6.4.4 Separation distances through and requirements of casting compound
    24 - 6.4.5 Separation distances through solid insulation
    24 - 6.4.6 Composite separations
    25 - 6.4.7 Creepage distance in air
    25 - 6.4.8 Creepage distance under coating
    29 - 6.4.9 Requirements for assembled printed circuit boards
    29 - 6.4.10 Separation by earth screens
    29 - 6.4.11 Internal wiring
    29 - 6.4.12 Electric strength tests
    30 - 6.4.13 Relays
    30 - 6.5 Protection against polarity reversal
    30 - 6.6 Earth conductors, connections and terminals
    31 - 6.7 Encapsulation used for the exclusion of a potentially explosive atmosphere
    31 - 7 Components on which intrinsic safety depends
    31 - 7.1 Rating of components
    32 - 7.2 Connectors for internal connections, plug-in cards and components
    32 - 7.3 Fuses
    33 - 7.4 Primary and secondary cells and batteries
    33 - 7.4.1 General
    33 - 7.4.2 Electrolyte leakage
    33 - 7.4.3 Cell and battery voltages
    34 - 7.4.4 Internal resistance of battery and cell
    34 - 7.4.5 Current-limiting devices for batteries in associated apparatus
    34 - 7.4.6 Current-limiting devices for batteries to be used and replaced in explosive atmospheres
    34 - 7.4.7 Current-limiting devices for batteries to be used but not replaced in explosive atmospheres
    34 - 7.4.8 External contacts for charging batteries
    35 - 7.4.9 Battery construction
    35 - 7.5 Semiconductors
    35 - 7.5.1 Transient effects
    35 - 7.5.2 Shunt voltage limiters
    36 - 7.5.3 Series current limiters
    36 - 7.6 Failure of components and connections
    37 - 7.7 Piezo-electric devices
    37 - 8 Infallible components, infallible assemblies of components and infallible connections
    37 - 8.1 Mains transformers
    37 - 8.1.1 Winding faults
    37 - 8.1.2 Protective measures
    37 - 8.1.3 Transformer construction
    38 - 8.1.4 Transformer type tests
    39 - 8.1.5 Routine test of mains transformers
    39 - 8.2 Transformers other than mains transformers
    39 - 8.3 Damping windings
    39 - 8.4 Current-limiting resistors
    40 - 8.5 Blocking capacitors
    40 - 8.6 Shunt safety assemblies
    40 - 8.6.1 General
    41 - 8.6.2 Safety shunts
    41 - 8.6.3 Shunt voltage limiters
    42 - 8.7 Wiring and connections
    42 - 8.8 Galvanically separating components
    43 - 9 Diode safety barriers
    43 - 9.1 General
    43 - 9.2 Construction
    43 - 9.2.1 Mounting
    43 - 9.2.2 Facilities for connection to earth
    43 - 9.2.3 Protection of components
    44 - 10 Type verifications and type tests
    44 - 10.1 Spark ignition test
    44 - 10.1.1 General
    44 - 10.1.2 Spark test apparatus
    45 - 10.2 Explosive test mixtures
    45 - 10.3 Calibration of the spark test apparatus
    45 - 10.4 Tests with the spark test apparatus
    45 - 10.4.1 Circuit test
    46 - 10.4.2 Safety factors
    47 - 10.4.3 Testing considerations
    47 - 10.4.4 Results of spark tests
    47 - 10.5 Temperature tests
    48 - 10.6 Voltage tests
    48 - 10.7 Small component ignition test
    49 - 10.8 Determination of parameters of loosely specified components
    49 - 10.9 Tests for cells and batteries
    49 - 10.9.1 General
    49 - 10.9.2 Electrolyte leakage test for cells and batteries
    50 - 10.9.3 Spark ignition and surface temperature of cells and batteries
    50 - 10.10 Mechanical tests
    50 - 10.10.1 Casting compound
    51 - 10.10.2 Partitions
    51 - 10.11 Tests for apparatus containing piezoelectric devices
    51 - 10.12 Type tests for diode safety barriers and safety shunts
    52 - 10.13 Cable pull test
    52 - 11 Routine verifications and tests
    52 - 11.1 Routine tests for diode safety barriers
    52 - 11.1.1 Completed barriers
    52 - 11.1.2 Diodes for 2-diode ‘ia’ barriers
    52 - 11. 2 Routine tests for mains transformers
    53 - 12 Marking
    53 - 12.1 General
    53 - 12.2 Marking of connection facilities
    55 - 13 Documentation
    56 - Annex A - Assessment of intrinsically safe circuits
    56 - A.1 Basic criteria
    56 - A.2 Assessment using reference curves and tables
    57 - A.3 Examples of simple circuits
    77 - Annex B - Spark test apparatus for intrinsically safe circuits
    77 - B.1 Test methods for spark ignition
    86 - Annex C - Measurement of creepage distances, clearances and separation distances through casting compound and through solid
    86 - C.1 Clearances and separation distances through casting compound and through solid insulation
    87 - C.2 Creepage distances
    89 - Annex D - Encapsulation
    89 - D.1 Adherence
    89 - D.2 Temperature

    Abstract - (Show below) - (Hide below)

    Specifies the construction and testing of intrinsically safe apparatus, intended for use in potentially explosive atmospheres and for associated apparatus, which is intended for connection to intrinsically safe circuits which enter such atmospheres. It also contains details of the test apparatus previously published as IEC 60079-3.

    Scope - (Show below) - (Hide below)

    1.1 This part of AS/NZS 60079 specifiesthe construction and testing of intrinsically safeapparatus, intended for use in potentially explosive atmospheres and for associatedapparatus, which is intended for connection to intrinsically safe circuits which entersuchatmospheres. It also contains details of the test apparatus previously published as IEC 60079-3.1.2 This standard supplements IEC 60079-0:1998, the requirements of which applyto intrinsically safe apparatus and to associated apparatus except as indicated in the following list.If associated apparatus is protected by a type of protection listed in IEC 60079-0 then therequirements of that method of protection together with the relevant parts of IEC60079-0 also apply to the associated apparatus. The list of exclusions which follows is directly applicable to associated apparatus intended for use in situations where there is no potentially explosive atmosphere and in other circumstances shouldbe used in combination with the requirements ofthe other methods of protection.1.3 This standard is applicable to electrical apparatus in which the electrical circuitsthemselves are incapable of causing an explosion in the surrounding explosive atmospheres.1.4 This standard is also applicable to electrical apparatus orparts of electrical apparatus located outside the potentially explosive atmosphere orprotected by another type of protection listed in IEC 60079-0, where the intrinsic safety of theelectrical circuits in thepotentially explosive atmosphere may depend upon the design and construction of such electrical apparatus or parts of such electrical apparatus. The electrical circuits exposed to the potentially explosive atmosphere are evaluated for use in such an atmosphere by applying this standard.

    General Product Information - (Show below) - (Hide below)

    Committee EL-014
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    Running concurrently with AS 2380.7-1987 First published as AS/NZS 60079.11:2000.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS 1939-1990 Degrees of protection provided by enclosures for electrical equipment (IP Code)
    AS/NZS 60079.0:2000 Electrical apparatus for explosive gas atmospheres General requirements
    AS/NZS 4695.112:1996 Fire hazard testing of electrotechnical products Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions

    Standards Referencing This Book - (Show below) - (Hide below)

    AS/NZS 60079.7:2002 Electrical apparatus for explosive gas atmospheres Increased safety ‘e’
    AS 60849-2004 Sound systems for emergency purposes (IEC 60849:1998 MOD)
    AS/NZS 3584.1:2005 Diesel engine systems for underground coal mines - Fire protected - Heavy duty
    AS/NZS 60079.25:2004 Electrical apparatus for explosive gas atmospheres Intrinsically safe systems
    AS/NZS 61241.14:2005 Electrical apparatus for use in the presence of combustible dust Selection and installation (IEC 61241-14, Ed.1.0(2004) MOD)
    AS/NZS 4024.1:2006 Series Safety of machinery Safety of machinery series
    AS 3846-2005 The handling and transport of dangerous cargoes in port areas
    AS/NZS 61241.0:2005 Electrical apparatus for use in the presence of combustible dust General requirements
    AS 4024.1202-2006 Safety of machinery General principles - Technical principles
    AS/NZS 2290.1:2005 Electrical equipment for coal mines - Introduction and maintenance - For hazardous areas
    AS/NZS 1680.1:2006 Interior and workplace lighting General principles and recommendations
    AS/NZS 1972:2006 Electric cables - Underground coal mines - Other than reeling and trailing (Reconfirmed 2020)
    AS/NZS 3800:2005 Electrical equipment for explosive atmospheres - Repair and overhaul
    AS/NZS 60079.20:2000 Electrical apparatus for explosive gas atmospheres Data for flammable gases and vapours, relating to the use of electrical apparatus
    AS/NZS 60079.0:2005 Electrical apparatus for explosive gas atmospheres General requirements
    AS/NZS 60079.27(INT):2006 Electrical apparatus for explosive gas atmospheres Fieldbus intrinsically safe concept (FISCO) and fieldbus non-incendive concept (FNICO)
    AS 60204.11-2006 Safety of machinery - Electrical equipment of machines Requirements for HV equipment for voltages above 1000 V a.c. or 1500 V d.c and not exceeding 36 kV (IEC 60204-11, Ed. 1.0 (2000) MOD)
    AS/NZS 2381.1:2005 Electrical equipment for explosive gas atmospheres - Selection, installation and maintenance - General requirements
    AS/NZS 2381.1:2005 Electrical equipment for explosive gas atmospheres - Selection, installation and maintenance - General requirements
    AS 60204.1-2005 Safety of machinery - Electrical equipment of machines General requirements (IEC 60204-1, Ed. 5 (FDIS) MOD)
    AS/NZS 4783.2:2002 Performance of electrical lighting equipment - Ballasts for fluorescent lamps Energy labelling and minimum energy performance standards requirements (Reconfirmed 2013)
    AS/NZS 60079.1:2002 Electrical apparatus for explosive gas atmospheres Flameproof enclosures ‘d’
    AS/NZS 3788:2006 Pressure equipment - In-service inspection
    AS/NZS 62013.1:2001 Caplights for use in mines susceptible to firedamp General requirements - Construction and testing in relation to the risk of explosion
    AS/NZS 61241.11:2006 Electrical apparatus for use in the presence of combustible dust Protection by intrinsic safety iD
    AS/NZS 60079.7:2006 Explosive atmospheres Equipment protection by increased safety 'e'
    AS/NZS 60079.15:2006 Electrical apparatus for explosive gas atmospheres Construction, test and marking of type of protection, n electrical apparatus
    HB 13-2000 Electrical equipment for hazardous areas
    AS/NZS 60079.27(INT):2003 Electrical apparatus for explosive gas atmospheres Fieldbus intrinsically safe concept (FISCO)
    AS/NZS 61241.18:2005 Electrical apparatus for use in the presence of combustible dust Protection by encapsulation 'mD'
    AS/NZS 60079.18:2005 Electrical apparatus for explosive gas atmospheres Construction, test and marking of type of protection encapsulation m electrical apparatus
    AS/NZS 60079.26 (INT):2005 Electrical apparatus for explosive gas atmospheres Construction, test and marking of Group II Zone 0 electrical apparatus
    AS/NZS 4871.1:2002 Electrical equipment for coal mines, for use underground General requirements
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