1、 S+ IEC 60079-11 Edition 6.0 2011-07 IEC STANDARDS+ Explosive atmospheres Part 11: Equipment protection by intrinsic safety “i“ Atmosphres explosives Partie 11: Protection de lquipement par scurit intrinsque i S+ IEC 60079-11:2011 colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011
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16、 02 11 Fax: +41 22 919 03 00 S+ IEC 60079-11 Edition 6.0 2011-07 IEC STANDARDS+ Explosive atmospheres Part 11: Equipment protection by intrinsic safety “i“ Atmosphres explosives Partie 11: Protection de lquipement par scurit intrinsque i INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTE
17、CHNIQUE INTERNATIONALE RG ICS 29.260.20 PRICE CODE CODE PRIX ISBN 978-2-88912-520-3 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale colour inside IEC 60079-11 Edition 6.0 2011-06 INTERNATIONAL STANDARD NORME INTERNAT
18、IONALE Explosive atmospheres Part 11: Equipment protection by intrinsic safety “i“ Atmosphres explosives Partie 11: Protection de lquipement par scurit intrinsque i IEC 60079-11:2011 colour inside October 2014 ICS 29.260.20 SC 31G/IEC 60079-11 (2011), sixth edition/I-SH 01 EXPLOSIVE ATMOSPHERES Part
19、 11: Equipment protection by intrinsic safety “i“ INTERPRETATION SHEET 1 This interpretation sheet has been prepared by subcommittee 31G: Equipment for explosive atmospheres Equipment protection by intrinsic safety “i“, of IEC technical committee 31. The text of this interpretation sheet is based on
20、 the following documents: ISH Report on voting 31G/235/ISH 31G/238/RVISH Full information on the voting for the approval of this interpretation sheet can be found in the report on voting indicated in the above table. _ Following decision No 16 of the TC 31 meeting in Melbourne in 2011, the issuing o
21、f an Interpretation Sheet for IEC 60079-11:2011 (6 thedition ) was requested, in order to clarify the significance of the changes with respect to the 5 thedition. Question What are the minor editorial, extensions, and major technical changes of the 6 thedition with respect to the 5 thedition? Answer
22、 The following table shows the significance of the changes. The significance of the changes between IEC Standard, IEC 60079-11, Edition 5, 2006-07 and IEC 60079-11, Edition 6, 2011-06 are as listed below October 2014 ICS 29.260.20 Significance of changes with respect to IEC 60079-11:2006 Type Signif
23、icant Changes Clause Minor and editorial changes Extension Major technical changes General: Changes to remove specific clause references to other IEC 60079 standards General x Scope: Expansion to include Group III 1 x Scope: Table 1 updated to include references to both IEC 60079-0 Edition 5 and Edi
24、tion 6 1 x Normative references: Deletion of IEC 60079-27, and addition of IEC 61158-2 and IEC 62013-1 2 x Terms and definitions: Commonly used definitions moved to IEC 60079-0. Energy limitation definitions moved from IEC 60079-0.New definitions added 3 x Spark ignition compliance: Group III igniti
25、on requirements added 5.5 x Temperature for small components for Group I and Group II: Relocated to IEC 60079-0 5.6.2 x Intrinsically safe apparatus and component temperature for Group III 5.6.5 x Enclosures for Group I or Group II apparatus 6.1.2 x Apparatus complying with Annex F 6.1.2.3 c) x Encl
26、osures for Group III apparatus 6.1.3 x Requirements for connections and accessories for IS apparatus when located in the non-hazardous area 6.2.5 C1 Separation of conductive parts 6.3.2 x Encapsulation 6.6.1 x Encapsulation used for the exclusion of explosive atmospheres 6.6.2 C2 Primary and seconda
27、ry cells and batteries 7.4.1 x Battery construction 7.4.2 x Level of Protection “ic” 8.1 x Filter capacitors 8.6.2 x Wiring, printed circuit board tracks, and connections 8.8 c) x FISCO apparatus 9.2 x Handlights and caplights 9.3 x Circuits with both inductance and capacitance 10.1.5.2 x Electrolyt
28、e leakage test for cells and batteries 10.5.2 x Spark ignition and surface temperature of cells and batteries 10.5.3 x Determination of the acceptability of fuses requiring encapsulation 10.6.2 x Optical isolators tests 10.11 x Marking 12.1 x Encapsulation Annex D C2 Fieldbus intrinsically safe conc
29、ept (FISCO) Apparatus requirements Annex G x Ignition testing of semiconductor limiting power supply circuits Annex H x October 2014 ICS 29.260.20 Explanation of the Types of Significant Changes: A) Definitions 1. Minor and editorial changes: Clarification Decrease of technical requirements Minor te
30、chnical change Editorial corrections These are changes which modify requirements in an editorial or a minor technical way. They include changes of the wording to clarify technical requirements without any technical change, or a reduction in level of existing requirement. 2. Extension: Addition of te
31、chnical options These are changes which add new or modify existing technical requirements, in a way that new options are given, but without increasing requirements for equipment that was fully compliant with the previous standard. Therefore, these will not have to be considered for products in confo
32、rmity with the preceding edition. 3. Major technical changes: addition of technical requirements increase of technical requirements These are changes to technical requirements (addition, increase of the level or removal) made in a way that a product in conformity with the preceding edition will not
33、always be able to fulfil the requirements given in the later edition. These changes have to be considered for products in conformity with the preceding edition. For these changes additional information is provided in clause B) below. NOTE These changes represent current technological knowledge. Howe
34、ver, these changes should not normally have an influence on equipment already placed on the market. B) Information about the background of Major technical changes C1 Requirements for external connections, other than battery charging connections, that are designed for use only when an explosive gas o
35、r dust atmosphere is not present, for example when in a non-hazardous area or when a gas-free permit is in force, have been added. C2 The requirements for encapsulation referenced in 6.6.2 and detailed in Annex D have been changed in terms of the thickness to the free surface and are extended relate
36、d to moulding. Annex D is changed from informative to normative. 2 60079-11 IEC:2011 CONTENTS FOREWORD . 7 1 Scope . 9 2 Normative references 14 3 Terms and definitions . 15 4 Grouping and classification of intrinsically safe apparatus and associated apparatus . 20 5 Levels of protection and ignitio
37、n compliance requirements of electrical apparatus 21 5.1 General . 21 5.2 Level of protection “ia“ . 21 5.3 Level of protection “ib“ . 22 5.4 Level of protection “ic“ . 22 5.5 Spark ignition compliance 22 5.6 Thermal ignition compliance 22 5.6.1 General . 22 5.6.2 Temperature for small components fo
38、r Group I and Group II 23 5.6.3 Wiring within intrinsically safe apparatus for Group I and Group II 23 5.6.4 Tracks on printed circuit boards for Group I and Group II . 24 5.6.5 Intrinsically safe apparatus and component temperature for Group III . 25 5.7 Simple apparatus . 26 6 Apparatus constructi
39、on . 27 6.1 Enclosures 27 6.1.1 General . 27 6.1.2 Enclosures for Group I or Group II apparatus . 27 6.1.3 Enclosures for Group III apparatus . 28 6.2 Facilities for connection of external circuits 28 6.2.1 Terminals 28 6.2.2 Plugs and sockets 31 6.2.3 Determination of maximum external inductance to
40、 resistance ratio (L o /R o ) for resistance limited power source 31 6.2.4 Permanently connected cable 32 6.2.5 Requirements for connections and accessories for IS apparatus when located in the non-hazardous area . 32 6.3 Separation distances . 33 6.3.1 General . 33 6.3.2 Separation of conductive pa
41、rts . 33 6.3.3 Voltage between conductive parts 37 6.3.4 Clearance 37 6.3.5 Separation distances through casting compound 37 6.3.6 Separation distances through solid insulation . 38 6.3.7 Composite separations 38 6.3.8 Creepage distance . 38 6.3.9 Distance under coating 40 6.3.10 Requirements for as
42、sembled printed circuit boards 40 6.3.11 Separation by earthed screens . 41 6.3.12 Internal wiring 42 6.3.13 Dielectric strength requirement 42 6.3.14 Relays . 42 6.4 Protection against polarity reversal 43 60079-11 IEC:2011 3 6.5 Earth conductors, connections and terminals . 43 6.6 Encapsulation 44
43、 6.6.1 General . 44 6.6.2 Encapsulation used for the exclusion of explosive atmospheres . 45 7 Components on which intrinsic safety depends 45 7.1 Rating of components 45 7.2 Connectors for internal connections, plug-in cards and components . 46 7.3 Fuses 46 7.4 Primary and secondary cells and batte
44、ries . 47 7.4.1 General . 47 7.4.2 Battery construction . 48 7.4.3 Electrolyte leakage and ventilation . 48 7.4.4 Cell voltages 49 7.4.5 Internal resistance of cell or battery 49 7.4.6 Batteries in equipment protected by other types of protection . 49 7.4.7 Batteries used and replaced in explosive a
45、tmospheres . 49 7.4.8 Batteries used but not replaced in explosive atmospheres 50 7.4.9 External contacts for charging batteries 50 7.5 Semiconductors . 50 7.5.1 Transient effects 50 7.5.2 Shunt voltage limiters. 50 7.5.3 Series current limiters 51 7.6 Failure of components, connections and separati
46、ons 51 7.7 Piezo-electric devices 52 7.8 Electrochemical cells for the detection of gases . 52 8 Infallible components, infallible assemblies of components and infallible connections on which intrinsic safety depends . 53 8.1 Level of Protection “ic” . 53 8.2 Mains transformers 53 8.2.1 General . 53
47、 8.2.2 Protective measures 53 8.2.3 Transformer construction . 53 8.2.4 Transformer type tests . 54 8.2.5 Routine test of mains transformers . 54 8.3 Transformers other than mains transformers 54 8.4 Infallible windings 55 8.4.1 Damping windings 55 8.4.2 Inductors made by insulated conductors . 55 8
48、.5 Current-limiting resistors 56 8.6 Capacitors . 56 8.6.1 Blocking capacitors 56 8.6.2 Filter capacitors . 57 8.7 Shunt safety assemblies 57 8.7.1 General . 57 8.7.2 Safety shunts . 57 8.7.3 Shunt voltage limiters. 58 8.8 Wiring, printed circuit board tracks, and connections 58 8.9 Galvanically sep
49、arating components 59 8.9.1 General . 59 4 60079-11 IEC:2011 8.9.2 Isolating components between intrinsically safe and non-intrinsically safe circuits . 59 8.9.3 Isolating components between separate intrinsically safe circuits . 59 9 Supplementary requirements for specific apparatus. 60 9.1 Diode safety barriers 60 9.1.1 General . 60 9.1.2 Construction 60 9.2 FISCO apparatus . 60 9.3 Handlights and caplights 61 1
