CLC IEC/TS 60079-39:2019

SLOVENSKI STANDARD
01-januar-2020
Eksplozivne atmosfere - 39. del: Lastnovarni sistemi za elektronsko krmiljeno
trajanje isker (IEC/TS 60079-39:2015)
Explosive atmospheres - Part 39: Intrinsically safe systems with electronically controlled
spark duration limitation (IEC/TS 60079-39:2015)
Explosionsgefährdete Bereiche - Teil 39: Eigensichere Systeme mit elektronisch
gesteuerter Begrenzung der Funkendauer (IEC/TS 60079-39:2015)
Atmosphères explosives - Partie 39 : Systèmes de sécurité intrinsèque à limite de la
durée d'étincelle contrôlée électroniquement (IEC/TS 60079-39:2015)
Ta slovenski standard je istoveten z: CLC IEC/TS 60079-39:2019
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC IEC/TS 60079-39

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
June 2019
ICS 29.260.20
English Version
Explosive atmospheres - Part 39: Intrinsically safe systems with
electronically controlled spark duration limitation
(IEC/TS 60079-39:2015)
Atmosphères explosives - Partie 39 : Systèmes de sécurité Explosionsgefährdete Bereiche - Teil 39: Eigensichere
intrinsèque à limite de la durée d'étincelle contrôlée Systeme mit elektronisch gesteuerter Begrenzung der
électroniquement Funkendauer
(IEC/TS 60079-39:2015) (IEC/TS 60079-39:2015)
This Technical Specification was approved by CENELEC on 2017-12-25.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC IEC/TS 60079-39:2019 E

European foreword
This document (CLC IEC/TS 60079-39:2019) consists of the text of the IEC/TS 60079-
39:2015 prepared by IEC/TC 31 "Equipment for explosive atmospheres".
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CENELEC shall not be held responsible for identifying any or all
such patent rights.
Endorsement notice
The text of the International Standard IEC/TS 60079-39:2019 was approved by CENELEC
as a European Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60079-0 -  Explosive atmospheres -- Part 0: Equipment EN 60079-0 -
- General requirements
IEC 60079-11 -  Explosive atmospheres - Part 11: Equipment EN 60079-11 -
protection by intrinsic safety "i"
IEC 60079-14 -  Explosive atmospheres - Part 14: Electrical EN 60079-14 -
installations design, selection and erection
IEC 60079-25 -  Explosive atmospheres - Part 25: EN 60079-25 -
Intrinsically safe electrical systems

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

IEC TS 60079-39:2015 © IEC 2015 – 3 –
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-
...