ДСТУ EN 60079-11:2016 Взрывоопасные газовые среды. Часть 11. Защита электрического оборудования с помощью искробезопасной электрической цепи (і) (EN 60079-11:2012, IDT)

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EN 60079-11:2012

Explosive atmospheres — Part 11: Equipment protection by intrinsic safety "i"

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ДCТУ EN 60079-11:2016
(EN 60079-11:2012, IDT)

Вибухонебезпечні газові середовища.
Частина 11. Захист електричного обладнання за допомогою іскробезпечного електричного кола «і»

З наданням чинності від 2017-01-01

CONTENTS

FOREWORD

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 com pliance

5.6 Thermal ignition com pliance

5.6.1 General

5.6.2 Temperature for small components for Group I and Group II

5.6.3 Wiring within intrinsically safe apparatus for Group I and Group II

5.6.4 Tracks on printed circuit boards for Group I and Group II

5.6.5 Intrinsically safe apparatus and component temperature for Group

5.7 Simple apparatus

6 Apparatus construction

6.1 Enclosures

6.1.1 General

6.1.2 Enclosures for Group I or Group II apparatus

6.1.3 Enclosures for Group III apparatus

6.2 Facilities for connection of external circuits

6.2.1 Terminals

6.2.2 Plugs and sockets

6.2.3 Determination of maximum external inductance to resistance ratio (L₀/R₀) for resistance limited power source

6.2.4 Permanently connected cable

6.2.5 Requirements for connections and accessories for IS apparatus when located in the non-hazardous area

6.3 Separation distances

6.3.1 General

6.3.2 Separation of conductive parts

6.3.3 Voltage between conductive parts

6.3.4 Clearance

6.3.5 Separation distances through casting compound

6.3.6 Separation distances through solid insulation

6.3.7 Composite separations

6.3.8 Creep age distance

6.3.9 Distance under coating

6.3.10 Requirements for assembled printed circuit boards

6.3.11 Separation by earthed screens

6.3.12 Internal wiring

6.3.13 Dielectric strength requirement

6.3.14 Relays

6.4 Protection against polarity reversal

6.5 Earth conductors, connections and terminals

6.6 Encapsulation

6.6.1 General

6.6.2 Encapsulation used for the exclusion of explosive atmospheres

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

7.4.1 General

7.4.2 Battery construction

7.4.3 Electrolyte leakage and ventilation

7.4.4 Cell voltages

7.4.5 Internal resistance of cell or battery

7.4.6 Batteries in equipment protected by other types of protection

7.4.7 Batteries used and replaced in explosive atmospheres

7.4.8 Batteries used but not replaced in explosive atmospheres

7.4.9 External contacts for charging batteries

7.5 Semiconductors

7.5.1 Transient effects

7.5.2 Shunt voltage limiters

7.5.3 Series current limiters

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

8.2.1 General

8.2.2 Protective measures

8.2.3 Transformer construction

8.2.4 Transformer type tests

8.2.5 Routine test of mains transformers

8.3 Transformers other than mains transformers

8.4 Infallible windings

8.4.1 Damping windings

8.4.2 Inductors made by insulated conductors

8.5 Current-limiting resistors

8.6 Capacitors

8.6.1 Blocking capacitors

8.6.2 Filter capacitors

8.7 Shunt safety assemblies

8.7.1 General

8.7.2 Safety shunts

8.7.3 Shunt voltage limiters

8.8 Wiring, printed circuit board tracks, and connections

8.9 Galvanically separating components

8.9.1 General

8.9.2 Isolating components between intrinsically safe and non-intrinsically safe circuits

8.9.3 Isolating components between separate intrinsically safe circuits

9 Supplementary requirements for specific apparatus

9.1 Diode safety barriers

9.1.1 General

9.1.2 C onstruction

9.2 FISCO apparatus

9.3 Handlights and caplights

10 Type verifications and type tests

10.1 Spark ignition test

10.1.1 General

10.1.2 Spark test apparatus

10.1.3 Test gas mixtures and spark test apparatus calibration current

10.1.4 Tests with the spark test apparatus

10.1.5 Testing considerations

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

10.5.1 General

10.5.2 Electrolyte leakage test for cells and batteries

10.5.3 Spark ignition and surface temperature of cells and batteries

10.5.4 Battery container pressure tests

10.6 Mechanical tests

10.6.1 Casting com pound

10.6.2 Determination of the acceptability of fuses requiring encapsulation

10.6.3 Partitions

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

10.11.1 General

10.11.2 Thermal conditioning, dielectric and carbonisation test

10.11.3 Dielectric and short-circuit test

10.12 Current carrying capacity of infallible printed circuit board connections

11 Routine verifications and tests

11.1 Routine tests for diode safety barriers

11.1.1 Completed barriers

11.1.2 Diodes for 2-diode “ia” 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 В (normative) Spark test apparatus for intrinsically safe circuits

Annex С (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) Field bus intrinsically safe concept (FISCO) - Apparatus requirements

Annex FI (informative) Ignition testing of semiconductor limiting power supply circuits

Bibliography

Figure 1 - Separation of intrinsically safe and non-intrinsically safe terminals

Figure 2 - Example of separation of conducting parts

Figure 3 - Determination of creepage distances

Figure 4 - Creepage distances and clearances on printed circuit boards

Figure 5 - Examples of independent and non-independent connecting elements

Figure A. 1 - Resistive circuits

Figure A.2 - Group I capacitive circuits

Figure A.3 - Group II capacitive circuits

Figure A.4 - Inductive circuits of Group II

Figure A.5 - Group I inductive circuits

Figure A.6 - Group IIC inductive circuits

Figure A.7 - Simple inductive circuit

Figure A.8 - Simple capacitive circuit

Figure A.9 - Equivalent capacitance

Figure B.1 - Spark test apparatus for intrinsically safe circuits

Figure B.2 - Cadmium contact disc

Figure B.3 - Wire holder

Figure B.4 - Example of a practical design of spark test apparatus

Figure B.5 - Arrangement for fusing tungsten wires

Figure C.1 - Measurement of clearance

Figure C.2 - Measurement of composite distances

Figure C.3 - Measurement of creepage

Figure C.4 - Measurement of composite creepage

Figure D.1 - Examples of encapsulated assemblies conforming to 6.3.5 and 6.6

Figure D.2 - Applications of encapsulation using casting compound without an enclosure

Figure D.3 - Examples of assemblies using moulding conforming to 6.6

Figure E.1 - Example of test circuit

Figure E.2 - Example of output waveform

Figure G.1 - Typical system

Figure H.1 - Safety factor vs ignition probablity

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

Table 2 - Temperature classification of copper wiring (in a maximum ambient temperature of 40 °С)

Table 3 - Temperature classification of tracks on printed circuit boards (in a maximum ambient temperature of 40 °С )

Table 4 - Maximum permitted power dissipation within a component immersed in dust

Table 5 - Clearances, creepage distances and separations

Table 6 - Minimum foil thickness or minimum wire diameter of the screen in relation to the rated current of the fuse

Table 7 - Compositions of explosive test mixtures adequate for 1,0 safety factor62

Table 8 - Compositions of explosive test mixtures adequate for 1,5 safety factor63

Table 10 - Routine test voltages for infallible transformers

Table 11 - Text of warning markings

Table A.1 - Permitted short-circuit current corresponding to the voltage and the Equipment Group

Table A.2 - Permitted capacitance corresponding to the voltage and the Equipment Group

Table A.3 - Permitted reduction of effective capacitance when protected by a series resistance

Table F.1 - Clearances, creepage distances and separations for Level of Protection ”ia” and “ib” when ingress protected, and special conditions of material and installation are fulfilled

Table F.2 - Clearances, creepage distances and separations for Level of Protection ”ic” when ingress is protected by an enclosure or by special conditions of installation

Table G.1 - Assessment of maximum output current for use with ‘ia’ and ‘ib’ FISCO rectangular supplies

Table G.2 - Assessment of maximum output current for use with ‘ic’ FISCO rectangular  supplies

Table H.1 - Sequence of tests

Table FI.2 - Safety factor provided by several explosive test mixtures that may be used

for the tests in Table H .1

Table H.3 - Example of a Group I circuit with characteristics described by Curve II of

Figure H.1 - This passes the test sequence of Table H.

Table H.4 - Example of a Group I circuit with characteristics described by Curve III of

Figure H.1 - This does not pass the test sequence of Table H.1