IEC TS 60079-39:2015
(Main)Explosive atmospheres - Part 39: Intrinsically safe systems with electronically controlled spark duration limitation
Explosive atmospheres - Part 39: Intrinsically safe systems with electronically controlled spark duration limitation
IEC TS 60079-39:2015(E) specifies the construction, testing, installation and maintenance of Power-i apparatus and systems which utilise electronically controlled spark duration limitation to maintain an adequate level of intrinsic safety. This Technical Specification contains requirements for intrinsically safe apparatus and wiring intended for use in explosive atmospheres and for associated apparatus intended for connection to intrinsically safe circuits entering such atmospheres. This Technical Specification excludes the level of protection "ia" and the use of software-controlled circuits. This Technical Specification applies to electrical equipment utilising voltages not higher than 40 V d.c. and a safety factor 1,5 for Groups IIB, IIA, I and III. It is also applicable to Group IIC "ic" apparatus with a safety factor 1,0. Group IIC "ib" apparatus with a safety factor 1,5 are restricted to voltages up to 32 V d.c. This type of protection is applicable to electrical equipment in which the electrical circuits themselves are incapable of causing an explosion of the surrounding explosive atmospheres. This Technical Specification is applicable to intrinsically safe apparatus and systems which utilise electronically controlled spark duration limitation with the aim of providing more electrical power while maintaining an adequate level of safety. This Technical Specification is also applicable to electrical equipment or parts of electrical equipment located outside hazardous areas or protected by another type of protection listed in the IEC 60079 series, where the intrinsic safety of the electrical circuits in explosive atmospheres depends on the design and construction of such electrical equipment or parts of such electrical equipment. The electrical circuits located in the hazardous area are evaluated for use in such locations by applying this Technical Specification. This Technical Specification supplements and modifies the requirements of IEC 60079-0, IEC 60079-11, IEC 60079-14, IEC 60079-17 and IEC 60079-25. Keywords: Power-i apparatus, intrinsically safe apparatus and wiring intended for use in explosive atmospheres
The contents of the corrigendum of October 2020 have been included in this copy.
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IEC TS 60079-39 ®
Edition 1.0 2015-06
TECHNICAL
SPECIFICATION
colour
inside
Explosive atmospheres –
Part 39: Intrinsically safe systems with electronically controlled spark duration
limitation
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
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3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
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IEC TS 60079-39 ®
Edition 1.0 2015-06
TECHNICAL
SPECIFICATION
colour
inside
Explosive atmospheres –
Part 39: Intrinsically safe systems with electronically controlled spark duration
limitation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-2734-3
– 2 – IEC TS 60079-39:2015 © IEC 2015
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references. 8
3 Definitions . 9
4 Power-i architecture . 10
5 Requirements for Power-i devices . 11
5.1 General . 11
5.2 Power-i source . 11
5.3 Power-i field device . 13
5.4 Power-i wiring . 14
5.5 Power-i terminator . 15
5.6 Test instruments for Power-i loop check . 15
5.7 Power-i application classes . 15
6 System requirements . 16
6.1 Selection of the permissible Power- i current class of the Power-i source . 16
6.2 Verification of a Power-i system . 17
7 Assessment and testing . 19
7.1 Procedure to define safety-relevant parameters . 19
7.2 Type test . 20
7.3 Routine test . 20
8 Marking of Power-i devices . 20
8.1 General . 20
8.2 Examples of marking . 20
9 Instructions. 21
Annex A (normative) Assessment of Power-i safety parameters . 22
A.1 General . 22
A.2 Power-i specific test equipment . 22
A.2.1 Power-i universal test equipment . 22
A.2.2 Power-i dummy load . 23
A.3 Determination of the safety-relevant parameters for Power-i devices and
Power-i wiring . 24
A.3.1 General . 24
A.3.2 Safety-relevant parameters for the Power-i source . 24
A.3.3 Safety-relevant parameters for the Power-i field devices . 31
A.3.4 Safety-relevant parameters for Power-i wiring . 34
A.3.5 Safety-relevant parameters for the Power-i terminator . 36
Annex B (informative) Explanation and details of the Power-i basic concept . 37
B.1 Physical basics of an ignition . 37
B.2 Output characteristics of a Power-i source . 39
B.3 Measurement and scientific results as basis for Power- i minimum ignition
values . 41
B.3.1 Test setups for the determination of the ignition probability . 41
B.3.2 Result of the spark ignition tests and their implementation in Table 3 . 43
Annex C (informative) Examples of Power-i devices and systems . 46
C.1 Power-i application for a solenoid valve . 46
C.2 Example of a generally designed Power-i source . 47
C.3 Example of a Power-i field device . 47
C.4 Example of a Power-i dummy load . 48
C.5 Example of a Power-i terminator . 48
Annex D (informative) Example of interconnection of Power-i devices including
Power-i wiring to a Power-i system . 50
D.1 Specific aim and given values . 50
D.2 Solution example . 50
Figure 1 – The simplest Power-i architecture . 10
Figure 2 – Example of complex Power-i concept architecture . 11
Figure 3 – Elements of a Power-i source with voltage and current limitation . 12
Figure 4 – Example of a universal Power-i field device (basic structure) . 14
Figure 5 – Basic assessment procedure for a Power-i system . 19
Figure A.1 – Basic principle of the Power-i universal test equipment . 23
Figure A.2 – Pulse output between terminals 3 and 1 of Figure A.1 . 23
Figure A.3 – Basic principle of a Power-i dummy load . 24
Figure A.4 – Basic principle of the equipment for the determination of the response
time t . 25
resp-source
Figure A.5 – Example of an oscillogram to determine the response time t . 26
resp-source
Figure A.6 – Test equipment for the determination of the assessment factor AF
source
(basic principle) . 27
Figure A.7 – Test equipment for the assessment factor test for Power-i source . 28
Figure A.8 – Example of an oscillogram from a test of a Power-i source with an
assessment factor AF = 8,29 for a break spark . 29
Figure A.9 – Test equipment for transition pulse test of a Power-i source . 30
Figure A.10 – Test equipment for the determination of the assessment factor
AF for Power-i field devices (basic principle) . 32
field device
Figure A.11 – Test equipment for the transition pulse test of Power-i field devices . 33
Figure A.12 – Evaluation parameter of test pulse U for transition pulse test . 34
pulse
Figure A.13 – Test equipment for the determination of the response time of the Power-
i trunk t (basic principle) . 35
resp-trunk
Figure B.1 – Example of a typical trace of a break spark supplied with a linearly limited
source . 38
Figure B.2 – Example of a typical trace of a break spark limited by a Power-i source . 38
Figure B.3 – Example of output set of characteristic curves of a Power-i source during
load connection . 40
Figure B.4 – Basic principle of a Power-i power source for the voltage threshold return
mode . 41
Figure B.5 – Example of output set of characteristic curves of a Power-i source in the
case of a failure . 41
Figure B.6 – Test setup with STA for break sparks . 42
Figure B.7 – Test setup with STA for make sparks . 42
Figure B.8 – Power-i ignition values for voltage class 24V (24 VDC) . 43
Figure B.9 – Power-i ignition values for voltage class 32V (32 VDC) . 44
– 4 – IEC TS 60079-39:2015 © IEC 2015
Figure B.10 – Power-i ignition values for voltage class 40V (40 VDC) . 44
Figure B.11 – Ignition energy in relation to the used hydrogen percentage in the gas
mixtures . 45
Figure C.1 – Simple solenoid valve Power-i application (example) . 46
Figure C.2 – Example of a generally styled Power-i field device . 47
Figure C.3 – Example of a V-limitation unit (level of protection “ib”) . 48
Figure C.4 – Example of a Power-i dummy load . 48
Figure C.5 – Example of a Power-i terminator .
...
IEC TS 60079-39 ®
Edition 1.0 2015-06
TECHNICAL
SPECIFICATION
colour
inside
Explosive atmospheres –
Part 39: Intrinsically safe systems with electronically controlled spark duration
limitation
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC TS 60079-39 ®
Edition 1.0 2015-06
TECHNICAL
SPECIFICATION
colour
inside
Explosive atmospheres –
Part 39: Intrinsically safe systems with electronically controlled spark duration
limitation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-2734-3
– 2 – IEC TS 60079-39:2015 © IEC 2015
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Definitions . 9
4 Power-i architecture . 10
5 Requirements for Power-i devices . 11
5.1 General . 11
5.2 Power-i source . 11
5.3 Power-i field device . 13
5.4 Power-i wiring . 14
5.5 Power-i terminator . 15
5.6 Test instruments for Power-i loop check . 15
5.7 Power-i application classes . 15
6 System requirements . 16
6.1 Selection of the permissible Power- i current class of the Power-i source . 16
6.2 Verification of a Power-i system . 17
7 Assessment and testing . 19
7.1 Procedure to define safety-relevant parameters . 19
7.2 Type test . 20
7.3 Routine test . 20
8 Marking of Power-i devices . 20
8.1 General . 20
8.2 Examples of marking . 20
9 Instructions . 21
Annex A (normative) Assessment of Power-i safety parameters . 22
A.1 General . 22
A.2 Power-i specific test equipment . 22
A.2.1 Power-i universal test equipment . 22
A.2.2 Power-i dummy load . 23
A.3 Determination of the safety-relevant parameters for Power-i devices and
Power-i wiring . 24
A.3.1 General . 24
A.3.2 Safety-relevant parameters for the Power-i source . 24
A.3.3 Safety-relevant parameters for the Power-i field devices. 31
A.3.4 Safety-relevant parameters for Power-i wiring . 34
A.3.5 Safety-relevant parameters for the Power-i terminator . 36
Annex B (informative) Explanation and details of the Power-i basic concept . 37
B.1 Physical basics of an ignition . 37
B.2 Output characteristics of a Power-i source . 39
B.3 Measurement and scientific results as basis for Power- i minimum ignition
values . 41
B.3.1 Test setups for the determination of the ignition probability . 41
B.3.2 Result of the spark ignition tests and their implementation in Table 3 . 43
Annex C (informative) Examples of Power-i devices and systems . 46
C.1 Power-i application for a solenoid valve . 46
C.2 Example of a generally designed Power-i source . 47
C.3 Example of a Power-i field device . 47
C.4 Example of a Power-i dummy load . 48
C.5 Example of a Power-i terminator . 48
Annex D (informative) Example of interconnection of Power-i devices including
Power-i wiring to a Power-i system . 50
D.1 Specific aim and given values . 50
D.2 Solution example . 50
Figure 1 – The simplest Power-i architecture . 10
Figure 2 – Example of complex Power-i concept architecture . 11
Figure 3 – Elements of a Power-i source with voltage and current limitation . 12
Figure 4 – Example of a universal Power-i field device (basic structure) . 14
Figure 5 – Basic assessment procedure for a Power-i system . 19
Figure A.1 – Basic principle of the Power-i universal test equipment . 23
Figure A.2 – Pulse output between terminals 3 and 1 of Figure A.1 . 23
Figure A.3 – Basic principle of a Power-i dummy load . 24
Figure A.4 – Basic principle of the equipment for the determination of the response
time t . 25
resp-source
Figure A.5 – Example of an oscillogram to determine the response time t . 26
resp-source
Figure A.6 – Test equipment for the determination of the assessment factor AF
source
(basic principle) . 27
Figure A.7 – Test equipment for the assessment factor test for Power-i source . 28
Figure A.8 – Example of an oscillogram from a test of a Power-i source with an
assessment factor AF = 8,29 for a break spark . 29
Figure A.9 – Test equipment for transition pulse test of a Power-i source . 30
Figure A.10 – Test equipment for the determination of the assessment factor
AF for Power-i field devices (basic principle) . 32
field device
Figure A.11 – Test equipment for the transition pulse test of Power-i field devices . 33
Figure A.12 – Evaluation parameter of test pulse U for transition pulse test . 34
pulse
Figure A.13 – Test equipment for the determination of the response time of the Power-
i trunk t (basic principle) . 35
resp-trunk
Figure B.1 – Example of a typical trace of a break spark supplied with a linearly limited
source . 38
Figure B.2 – Example of a typical trace of a break spark limited by a Power-i source . 38
Figure B.3 – Example of output set of characteristic curves of a Power-i source during
load connection . 40
Figure B.4 – Basic principle of a Power-i power source for the voltage threshold return
mode . 41
Figure B.5 – Example of output set of characteristic curves of a Power-i source in the
case of a failure . 41
Figure B.6 – Test setup with STA for break sparks . 42
Figure B.7 – Test setup with STA for make sparks . 42
Figure B.8 – Power-i ignition values for voltage class 24V (24 VDC) . 43
Figure B.9 – Power-i ignition values for voltage class 32V (32 VDC) . 44
– 4 – IEC TS 60079-39:2015 © IEC 2015
Figure B.10 – Power-i ignition values for voltage class 40V (40 VDC) . 44
Figure B.11 – Ignition energy in relation to the used hydrogen percentage in the gas
mixtures . 45
Figure C.1 – Simple solenoid valve Power-i application (example) . 46
Figure C.2 – Example of a generally styled Power-i field device . 47
Figure C.3 – Example of a V-limitation unit (level of protection “ib”) . 48
Figure C.4 – Example of a Power-i dummy load .
...
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