UL 60079-11
Explosive Atmospheres - Part 11: Equipment Protection by Intrinsic Safety 'i'

DETAILS
Edition Number:6SCC Approved:--
Edition Date:2013-02-15DOD Approved: --
Price Code:HANSI Approved: 2014-03-28
Type:ulisaiec

  • SCOPE

    1 Scope

    This part of IEC 60079 specifies the construction and testing of intrinsically safe apparatus intended for use in an explosive atmosphere and for associated apparatus, which is intended for connection to intrinsically safe circuits which enter such atmospheres.

    1DV.1 Modification of Clause 1, first paragraph as follows:

    1DV.1.1 Replace "part of IEC 60079" with "standard".

    This type of protection is applicable to electrical equipment in which the electrical circuits themselves are incapable of causing an explosion in the surrounding explosive atmospheres.

    This standard is also applicable to electrical equipment or parts of electrical equipment located outside the explosive atmosphere or protected by another Type of Protection listed in IEC 60079-0, where the intrinsic safety of the electrical circuits in the explosive atmosphere may depend upon the design and construction of such electrical equipment or parts of such electrical equipment. The electrical circuits exposed to the explosive atmosphere are evaluated for use in such an atmosphere by applying this standard.

    The requirements for intrinsically safe systems are provided in IEC 60079-25.

    This standard supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard shall take precedence.

    If requirements in this standard are applicable to both intrinsically safe apparatus and associated apparatus the term “apparatus” is used throughout the standard.

    This standard is for electrical equipment only; therefore the term “equipment” used in the standard always means “electrical equipment”.

    If associated apparatus is placed in the explosive atmosphere, it shall be protected by an appropriate Type of Protection listed in IEC 60079-0, and then the requirements of that method of protection together with the relevant parts of IEC 60079-0 also apply to the associated apparatus.

    Table 1 – Applicability of specific clauses of IEC 60079-0

    Clause or subclause of IEC 60079-0

    IEC 60079-0 clause application to IEC 60079-11

    Intrinsically safe apparatus

    Associated apparatus

    Ed. 5.0 (2007)

    Ed. 6.0 (2011)

    Clause / Subclause title

    Group I and Group II

    Group III

    (informative)

    (informative)

    (normative)

    1

    1

    Scope

    Applies

    Applies

    Applies

    2

    2

    Normative references

    Applies

    Applies

    Applies

    3

    3

    Terms and definitions

    Applies

    Applies

    Applies

    4

    4

    Equipment grouping

    Applies

    Applies

    Applies

    4.1

    4.1

    Group I

    Applies

    Excluded

    Applies

    4.2

    4.2

    Group II

    Applies

    Excluded

    Applies

    4.3

    4.3

    Group III

    Excluded

    Applies

    Applies

    4.4

    4.4

    Equipment for a particular explosive atmosphere

    Applies

    Applies

    Applies

    5.1

    5.1

    Environmental influences

    Applies

    Applies

    Applies

    5.1.1

    5.1.1

    Ambient temperature

    Applies

    Applies

    Applies

    5.1.2

    5.1.2

    External source of heating or cooling

    Applies

    Applies

    Applies

    5.2

    5.2

    Service temperature

    Applies

    Applies

    Applies

    5.3.1

    5.3.1

    Determination of maximum surface temperature

    Applies

    Applies

    Excluded

    5.3.2.1

    5.3.2.1

    Group I electrical equipment

    Applies

    Excluded

    Excluded

    5.3.2.2

    5.3.2.2

    Group II electrical equipment

    Applies

    Excluded

    Excluded

    5.3.2.3

    5.3.2.3

    Group III electrical equipment

    Excluded

    Applies

    Excluded

    5.3.3

    5.3.3

    Small component temperature for Group I or Group II electrical equipment

    Applies

    Excluded

    Excluded

    6.1

    6.1

    General

    Applies

    Applies

    Applies

    6.2

    6.2

    Mechanical strength of equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    6.3

    6.3

    Opening times

    Excluded

    Excluded

    Excluded

    6.4

    6.4

    Circulating currents in enclosures (e.g. of large electrical machines)

    Excluded

    Excluded

    Excluded

    6.5

    6.5

    Gasket retention

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    6.6

    6.6

    Electromagnetic and ultrasonic radiating equipment

    Applies

    Applies

    Excluded

    7.1.1

    7.1.1

    Applicability

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.1.2

    7.1.2.1

    Specification of materials

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.1.3

    7.1.2.2

    Plastic materials

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.1.4

    7.1.2.3

    Elastomers

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.2

    7.2

    Thermal endurance

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.3

    7.3

    Resistance to light

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.4

    7.4

    Electrostatic charges on external non-metallic materials

    Applies

    Applies

    Excluded

    NR

    7.5

    Accessible metal parts

    Applies

    Applies

    Excluded

    7.5

    NR

    Threaded holes

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    8.1

    8.1

    Material composition

    Applies

    Applies

    Excluded

    8.1.1

    8.2

    Group I

    Applies

    Excluded

    Excluded

    8.1.2

    8.3

    Group II

    Applies

    Excluded

    Excluded

    8.1.3

    8.4

    Group III

    Excluded

    Applies

    Excluded

    8.2

    NR

    Threaded holes

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    9

    9

    Fasteners

    Excluded

    Excluded

    Excluded

    10

    10

    Interlocking devices

    Excluded

    Excluded

    Excluded

    11

    11

    Bushings

    Excluded

    Excluded

    Excluded

    12

    12

    Materials used for cementing

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    13

    13

    Ex Components

    Applies

    Applies

    Applies

    14

    14

    Connection facilities and termination compartments

    Excluded

    Excluded

    Excluded

    15

    15

    Connection facilities for earthing or bonding conductors

    Excluded

    Excluded

    Excluded

    16

    16

    Entries into enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    17

    17

    Supplementary requirements for rotating machines

    Excluded

    Excluded

    Excluded

    18

    18

    Supplementary requirements for switchgear

    Excluded

    Excluded

    Excluded

    19

    19

    Supplementary requirements for fuses

    Excluded

    Excluded

    Excluded

    20

    20

    Supplementary requirements for plugs, socket outlets and connectors

    Excluded

    Excluded

    Excluded

    21

    21

    Supplementary requirements for luminaires

    Excluded

    Excluded

    Excluded

    22

    22

    Supplementary requirements for caplights and handlights

    Modified

    Modified

    Excluded

    23.1

    23.1

    General

    Applies

    Applies

    Applies

    23.2

    23.2

    Batteries

    Excluded

    Excluded

    Excluded

    23.3

    23.3

    Cell types

    Applies

    Applies

    Applies

    23.4

    23.4

    Cells in a battery

    Applies

    Applies

    Applies

    23.5

    23.5

    Ratings of batteries

    Applies

    Applies

    Applies

    23.6

    23.6

    Interchangeability

    Applies

    Applies

    Applies

    23.7

    23.7

    Charging of primary batteries

    Applies

    Applies

    Applies

    23.8

    23.8

    Leakage

    Applies

    Applies

    Applies

    23.9

    23.9

    Connections

    Applies

    Applies

    Applies

    23.10

    23.10

    Orientation

    Applies

    Applies

    Applies

    23.11

    23.11

    Replacement of cells or batteries

    Applies

    Applies

    Applies

    23.12

    23.12

    Replaceable battery pack

    Applies

    Applies

    Applies

    24

    24

    Documentation

    Applies

    Applies

    Applies

    25

    25

    Compliance of prototype or sample with documents

    Applies

    Applies

    Applies

    26.1

    26.1

    General

    Applies

    Applies

    Applies

    26.2

    26.2

    Test configuration

    Applies

    Applies

    Applies

    26.3

    26.3

    Tests in explosive test mixtures

    Applies

    Applies

    Applies

    26.4.1

    26.4.1

    Order of tests

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.1

    26.4.1.1

    Metallic enclosures, metallic parts of enclosures and glass parts of enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.2

    26.4.1.2

    Non-metallic enclosures or non-metallic parts of enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.2.1

    26.4.1.2.1

    Group I electrical equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.2.2

    26.4.1.2.2

    Group II and Group III electrical equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.2

    26.4.2

    Resistance to impact

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.3

    26.4.3

    Drop test

    Applies

    Applies

    Excluded except when 6.1.2.3 a) is applied

    26.4.4

    26.4.4

    Acceptance criteria

    Applies

    Applies

    Excluded except when 6.1.2.3 a) is applied

    26.4.5

    26.4.5

    Degree of protection (IP) by enclosures

    Applies

    Applies

    Applies

    26.5.1.1

    26.5.1.1

    General

    Applies

    Applies

    Excluded

    26.5.1.2

    26.5.1.2

    Service temperature

    Modified

    Modified

    Modified

    26.5.1.3

    26.5.1.3

    Maximum surface temperature

    Modified

    Modified

    Modified

    26.5.2

    26.5.2

    Thermal shock test

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.5.3

    26.5.3

    Small component ignition test (Group I and Group II)

    Applies

    Excluded

    Excluded

    26.6

    26.6

    Torque test for bushings

    Excluded

    Excluded

    Excluded

    26.7

    26.7

    Non-metallic enclosures or non-metallic parts of enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.8

    26.8

    Thermal endurance to heat

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.9

    26.9

    Thermal endurance to cold

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.10

    26.10

    Resistance to light

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.11

    26.11

    Resistance to chemical agents for Group I electrical equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded

    Excluded

    26.12

    26.12

    Earth continuity

    Excluded

    Excluded

    Excluded

    26.13

    26.13

    Surface resistance test of parts of enclosures of non-metallic materials

    Applies

    Applies

    Excluded

    26.15

    26.14

    Measurement of capacitance

    Applies

    Applies

    Excluded

    NR

    26.15

    Verification of ratings of ventilating fans

    Excluded

    Excluded

    Excluded

    NR

    26.16

    Alternative qualification of elastomeric sealing O-rings

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    27

    27

    Routine tests

    Applies

    Applies

    Applies

    28

    28

    Manufacturer’s responsibility

    Applies

    Applies

    Applies

    29

    29

    Marking

    Applies

    Applies

    Applies

    30

    30

    Instructions

    Applies

    Applies

    Applies

    Annex A (Normative)

    Annex A (Normative)

    Supplementary requirements for cable glands

    Excluded

    Excluded

    Excluded

    Annex B (Normative)

    Annex B (Normative)

    Requirements for Ex Components

    Applies

    Applies

    Applies

    Annex C (Normative)

    Annex C (Normative)

    Example of rig for resistance to impact test

    Applies

    Applies

    Excluded except when 6.1.2.3 a) is applied

    Annex D (Informative)

    NR

    Alternative risk assessment method encompassing “equipment protection levels” for Ex equipment

    Applies

    Applies

    Applies

    Annex E (Informative)

    Annex D (Informative)

    Motors supplied by converters

    Excluded

    Excluded

    Excluded

    NR

    Annex E (Informative)

    Temperature rise testing of electric machines

    Excluded

    Excluded

    Excluded

    NR

    Annex F (Informative)

    Guideline flowchart for tests of non-metallic enclosures or nonmetallic parts of enclosures (26.4 )

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    Applies – This requirement of IEC 60079-0 is applied without change.

    Excluded – This requirement of IEC 60079-0 does not apply.

    Excluded except – This requirement of IEC 60079-0 does not apply except when the conditions stated are met.

    Modified – This requirement of IEC 60079-0 is modified as detailed in this standard.

    NR – No requirements.

    NOTE The clause numbers in the above table are shown for information only. The applicable requirements of IEC 60079-0 are identified by the clause title which is normative. This table was written against the specific requirements of IEC 60079-0, ed. 6.0. The clause numbers for the previous edition are shown for information only. This is to enable the General requirements IEC 60079-0, ed. 5.0, to be used where necessary with this part of IEC 60079. Where there were no requirements, indicated by NR, or there is a conflict between requirements, the later edition requirements take precedence.

    1DV Modification of Table 1DV NOTE to replace with the following:

    Table 1DV – Applicability of specific clauses of IEC 60079-0

    Clause or subclause of IEC 60079-0

    IEC 60079-0 clause application to IEC 60079-11

    Intrinsically safe apparatus

    Associated apparatus

    Ed. 5.0

    Ed. 6.0

    Clause / Subclause title

    Group I and Group II

    Group III

    (informative)

    (informative)

    (normative)

    1

    1

    Scope

    Applies

    Applies

    Applies

    2

    2

    Normative references

    Applies

    Applies

    Applies

    3

    3

    Terms and definitions

    Applies

    Applies

    Applies

    4

    4

    Equipment grouping

    Applies

    Applies

    Applies

    4.1

    4.1

    Group I

    Applies

    Excluded

    Applies

    4.2

    4.2

    Group II

    Applies

    Excluded

    Applies

    4.3

    4.3

    Group III

    Excluded

    Applies

    Applies

    4.4

    4.4

    Equipment for a particular explosive atmosphere

    Applies

    Applies

    Applies

    5.1

    5.1

    Environmental influences

    Applies

    Applies

    Applies

    5.1.1

    5.1.1

    Ambient temperature

    Applies

    Applies

    Applies

    5.1.2

    5.1.2

    External source of heating or cooling

    Applies

    Applies

    Applies

    5.2

    5.2

    Service temperature

    Applies

    Applies

    Applies

    5.3.1

    5.3.1

    Determination of maximum surface temperature

    Applies

    Applies

    Excluded

    5.3.2.1

    5.3.2.1

    Group I electrical equipment

    Applies

    Excluded

    Excluded

    5.3.2.2

    5.3.2.2

    Group II electrical equipment

    Applies

    Excluded

    Excluded

    5.3.2.3

    5.3.2.3

    Group III electrical equipment

    Excluded

    Applies

    Excluded

    5.3.3

    5.3.3

    Small component temperature for Group I or Group II electrical equipment

    Applies

    Excluded

    Excluded

    6.1

    6.1

    General

    Applies

    Applies

    Applies

    6.2

    6.2

    Mechanical strength of equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    6.3

    6.3

    Opening times

    Excluded

    Excluded

    Excluded

    6.4

    6.4

    Circulating currents in enclosures (e.g. of large electrical machines)

    Excluded

    Excluded

    Excluded

    6.5

    6.5

    Gasket retention

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    6.6

    6.6

    Electromagnetic and ultrasonic radiating equipment

    Applies

    Applies

    Excluded

    7.1.1

    7.1.1

    Applicability

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.1.2

    7.1.2.1

    Specification of materials

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.1.3

    7.1.2.2

    Plastic materials

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.1.4

    7.1.2.3

    Elastomers

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.2

    7.2

    Thermal endurance

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.3

    7.3

    Resistance to light

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    7.4

    7.4

    Electrostatic charges on external non-metallic materials

    Applies

    Applies

    Excluded

    NR

    7.5

    Accessible metal parts

    Applies

    Applies

    Excluded

    7.5

    NR

    Threaded holes

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    8.1

    8.1

    Material composition

    Applies

    Applies

    Excluded

    8.1.1

    8.2

    Group I

    Applies

    Excluded

    Excluded

    8.1.2

    8.3

    Group II

    Applies

    Excluded

    Excluded

    8.1.3

    8.4

    Group III

    Excluded

    Applies

    Excluded

    8.2

    NR

    Threaded holes

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    9

    9

    Fasteners

    Excluded

    Excluded

    Excluded

    10

    10

    Interlocking devices

    Excluded

    Excluded

    Excluded

    11

    11

    Bushings

    Excluded

    Excluded

    Excluded

    12

    12

    Materials used for cementing

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    13

    13

    Ex Components

    Applies

    Applies

    Applies

    14

    14

    Connection facilities and termination compartments

    Excluded

    Excluded

    Excluded

    15

    15

    Connection facilities for earthing or bonding conductors

    Excluded

    Excluded

    Excluded

    16

    16

    Entries into enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    17

    17

    Supplementary requirements for rotating machines

    Excluded

    Excluded

    Excluded

    18

    18

    Supplementary requirements for switchgear

    Excluded

    Excluded

    Excluded

    19

    19

    Supplementary requirements for fuses

    Excluded

    Excluded

    Excluded

    20

    20

    Supplementary requirements for plugs, socket outlets and connectors

    Excluded

    Excluded

    Excluded

    21

    21

    Supplementary requirements for luminaires

    Excluded

    Excluded

    Excluded

    22

    22

    Supplementary requirements for caplights and handlights

    Modified

    Modified

    Excluded

    23.1

    23.1

    General

    Applies

    Applies

    Applies

    23.2

    23.2

    Batteries

    Excluded

    Excluded

    Excluded

    23.3

    23.3

    Cell types

    Applies

    Applies

    Applies

    23.4

    23.4

    Cells in a battery

    Applies

    Applies

    Applies

    23.5

    23.5

    Ratings of batteries

    Applies

    Applies

    Applies

    23.6

    23.6

    Interchangeability

    Applies

    Applies

    Applies

    23.7

    23.7

    Charging of primary batteries

    Applies

    Applies

    Applies

    23.8

    23.8

    Leakage

    Applies

    Applies

    Applies

    23.9

    23.9

    Connections

    Applies

    Applies

    Applies

    23.10

    23.10

    Orientation

    Applies

    Applies

    Applies

    23.11

    23.11

    Replacement of cells or batteries

    Applies

    Applies

    Applies

    23.12

    23.12

    Replaceable battery pack

    Applies

    Applies

    Applies

    24

    24

    Documentation

    Applies

    Applies

    Applies

    25

    25

    Compliance of prototype or sample with documents

    Applies

    Applies

    Applies

    26.1

    26.1

    General

    Applies

    Applies

    Applies

    26.2

    26.2

    Test configuration

    Applies

    Applies

    Applies

    26.3

    26.3

    Tests in explosive test mixtures

    Applies

    Applies

    Applies

    26.4.1

    26.4.1

    Order of tests

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.1

    26.4.1.1

    Metallic enclosures, metallic parts of enclosures and glass parts of enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.2

    26.4.1.2

    Non-metallic enclosures or non-metallic parts of enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.2.1

    26.4.1.2.1

    Group I electrical equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded

    Excluded except when 6.1.2.3 a) is applied

    26.4.1.2.2

    26.4.1.2.2

    Group II and Group III electrical equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.2

    26.4.2

    Resistance to impact

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.4.3

    26.4.3

    Drop test

    Applies

    Applies

    Excluded except when 6.1.2.3 a) is applied

    26.4.4

    26.4.4

    Acceptance criteria

    Applies

    Applies

    Excluded except when 6.1.2.3 a) is applied

    26.4.5

    26.4.5

    Degree of protection (IP) by enclosures

    Applies

    Applies

    Applies

    26.5.1.1

    26.5.1.1

    General

    Applies

    Applies

    Excluded

    26.5.1.2

    26.5.1.2

    Service temperature

    Modified

    Modified

    Modified

    26.5.1.3

    26.5.1.3

    Maximum surface temperature

    Modified

    Modified

    Modified

    26.5.2

    26.5.2

    Thermal shock test

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.5.3

    26.5.3

    Small component ignition test (Group I and Group II)

    Applies

    Excluded

    Excluded

    26.6

    26.6

    Torque test for bushings

    Excluded

    Excluded

    Excluded

    26.7

    26.7

    Non-metallic enclosures or non-metallic parts of enclosures

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.8

    26.8

    Thermal endurance to heat

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.9

    26.9

    Thermal endurance to cold

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.10

    26.10

    Resistance to light

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    26.11

    26.11

    Resistance to chemical agents for Group I electrical equipment

    Excluded except when 6.1.2.3 a) is applied

    Excluded

    Excluded

    26.12

    26.12

    Earth continuity

    Excluded

    Excluded

    Excluded

    26.13

    26.13

    Surface resistance test of parts of enclosures of non-metallic materials

    Applies

    Applies

    Excluded

    26.15

    26.14

    Measurement of capacitance

    Applies

    Applies

    Excluded

    NR

    26.15

    Verification of ratings of ventilating fans

    Excluded

    Excluded

    Excluded

    NR

    26.16

    Alternative qualification of elastomeric sealing O-rings

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    27

    27

    Routine tests

    Applies

    Applies

    Applies

    28

    28

    Manufacturer’s responsibility

    Applies

    Applies

    Applies

    29

    29

    Marking

    Applies

    Applies

    Applies

    30

    30

    Instructions

    Applies

    Applies

    Applies

    Annex A (Normative)

    Annex A (Normative)

    Supplementary requirements for cable glands

    Excluded

    Excluded

    Excluded

    Annex B (Normative)

    Annex B (Normative)

    Requirements for Ex Components

    Applies

    Applies

    Applies

    Annex C (Normative)

    Annex C (Normative)

    Example of rig for resistance to impact test

    Applies

    Applies

    Excluded except when 6.1.2.3 a) is applied

    Annex D (Informative)

    NR

    Alternative risk assessment method encompassing “equipment protection levels” for Ex equipment

    Applies

    Applies

    Applies

    Annex E (Informative)

    Annex D (Informative)

    Motors supplied by converters

    Excluded

    Excluded

    Excluded

    NR

    Annex E (Informative)

    Temperature rise testing of electric machines

    Excluded

    Excluded

    Excluded

    NR

    Annex F (Informative)

    Guideline flowchart for tests of non-metallic enclosures or nonmetallic parts of enclosures (26.4 )

    Excluded except when 6.1.2.3 a) is applied

    Excluded except when 6.1.3 a) is applied.

    Excluded except when 6.1.2.3 a) is applied

    Applies – This requirement of IEC 60079-0 is applied without change.

    Excluded – This requirement of IEC 60079-0 does not apply.

    Excluded except – This requirement of IEC 60079-0 does not apply except when the conditions stated are met.

    Modified – This requirement of IEC 60079-0 is modified as detailed in this standard.

    NR – No requirements.

    NOTE 1 The clause numbers in the above table are shown for information only. The applicable requirements of IEC 60079-0 are identified by the clause title which is normative. This table was written against the specific requirements of IEC 60079-0, ed. 6.0. The clause numbers for the previous edition are shown for information only. This is to enable the General requirements IEC 60079-0, ed. 5.0, to be used where necessary with this part of IEC 60079. Where there were no requirements, indicated by NR, or there is a conflict between requirements, the later edition requirements take precedence.

    NOTE 2 In the US, the authority having jurisdiction for underground mines is the Mine Safety and Health Administration (MSHA) of the federal government. Additional regulations beyond those detailed here will also apply.

    1DV.2 Addition of 1DV.2.1

    1DV.2.1 Where references are made to other IEC 60079 standards, the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
    • Foreword
    • Deviations
    • IEC Foreword
      • EXPLOSIVE ATMOSPHERES – Part 11 : Equipment Protection By Intrinsic Safety "i"
        • 1 Scope
        • 2 Normative references
        • 3 Terms and definitions
        • 4 Grouping and classification of intrinsically safe apparatus and associated apparatus
        • 5 Levels of protection and ignition compliance requirements of electrical apparatus
          • 5.1 General
          • 5.2 Level of protection "ia"
          • 5.3 Level of protection "ib"
          • 5.4 Level of protection "ic"
          • 5.5 Spark ignition compliance
          • 5.6 Thermal ignition compliance
          • 5.7 Simple apparatus
        • 6 Apparatus construction
          • 6.1 Enclosures
          • 6.2 Facilities for connection of external circuits
          • 6.3 Separation distances
          • 6.4 Protection against polarity reversal
          • 6.5 Earth conductors, connections and terminals
          • 6.6 Encapsulation
        • 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
          • 7.5.3.1DV.1 Blocking Devices
          • 7.6 Failure of components, connections and separations
          • 7.7 Piezo-electric devices
          • 7.8 Electrochemical cells for the detection of gases
        • 8 Infallible components, infallible assemblies of components and infallible connections on which intrinsic safety depends
          • 8.1 Level of Protection “ic”
          • 8.2 Mains transformers
          • 8.3 Transformers other than mains transformers
          • 8.4 Infallible windings
          • 8.5 Current-limiting resistors
          • 8.6 Capacitors
          • 8.7 Shunt safety assemblies
          • 8.8 Wiring, printed circuit board tracks, and connections
          • 8.9 Galvanically separating components
        • 9 Supplementary requirements for specific apparatus
          • 9.1 Diode safety barriers
          • 9.2 FISCO apparatus
          • 9.3 Handlights and caplights
        • 10 Type verifications and type tests
          • 10.1 Spark ignition test
          • 10.2 Temperature tests
          • 10.3 Dielectric strength tests
          • 10.4 Determination of parameters of loosely specified components
          • 10.5 Tests for cells and batteries
          • 10.6 Mechanical tests
          • 10.7 Tests for intrinsically safe apparatus containing piezoelectric devices
          • 10.8 Type tests for diode safety barriers and safety shunts
          • 10.9 Cable pull test
          • 10.10 Transformer tests
          • 10.11 Optical isolators tests
          • 10.12 Current carrying capacity of infallible printed circuit board connections
        • 11 Routine verifications and tests
          • 11.1 Routine tests for diode safety barriers
          • 11.2 Routine tests for infallible transformers
        • 12 Marking
          • 12.1 General
          • 12.2 Marking of connection facilities
          • 12.3 Warning markings
          • 12.4 Examples of marking
        • 13 Documentation
    • Annex A(normative)Assessment of intrinsically safe circuits
    • Annex B(normative) Spark test apparatus for intrinsically safe circuits
    • Annex C(informative) Measurement of creepage distances, clearances and separation distances through casting compound and through solid insulation
    • Annex D(normative) Encapsulation
    • Annex E(informative) Transient energy test
    • Annex F(normative) Alternative separation distances for assembled printed circuit boards and separation of components
    • Annex G (normative)Fieldbus intrinsically safe concept (FISCO) – Apparatus requirements
    • Annex H(informative)Ignition testing of semiconductor limiting power supply circuits
    • Annex DVI(informative)Explanatory guide for the application of "ic"
    • Bibliography