Explosive atmospheres - Part 39: Intrinsically safe systems with electronically controlled spark duration limitation

This Technical Specification 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 his 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.

Explosionsgefährdete Bereiche - Teil 39: Eigensichere Systeme mit elektronisch gesteuerter Begrenzung der Funkendauer

Atmosphères explosives - Partie 39 : Systèmes de sécurité intrinsèque à limite de la durée d'étincelle contrôlée électroniquement

Eksplozivne atmosfere - 39. del: Lastnovarni sistemi za elektronsko krmiljeno trajanje isker (IEC/TS 60079-39:2015)

Ta tehnična specifikacija določa konstrukcijo, preskušanje, namestitev ter vzdrževanje električnih naprav in sistemov i, ki uporabljajo elektronsko krmiljeno trajanje isker z namenom zagotavljanja ustrezne ravni lastne varnosti. Ta tehnična specifikacija vsebuje zahteve za lastnovarne naprave in napeljave, namenjene uporabi v eksplozivnih atmosferah, ter za povezane naprave, namenjene za povezavo z lastnovarnimi tokokrogi, ki vstopajo v take atmosfere. Ta tehnična specifikacija izključuje raven zaščite »ia« in uporabo tokokrogov, krmiljenih s programsko opremo. Ta tehnična specifikacija se uporablja za električno opremo, ki uporablja napetosti, ki niso višje od 40 V enosmerne napetosti, in varnostni faktor 1,5 za skupine IIB, IIA, I ter III. Uporablja se tudi za naprave skupine IIC »ic« z varnostnim faktorjem 1,0. Naprave skupine IIC »ib« z varnostnim faktorjem 1,5 so omejene na napetosti do 32 V enosmerne napetosti. Ta vrsta zaščite se uporablja za električno opremo, v kateri električni tokokrogi sami ne morejo povzročiti eksplozije v okoliških eksplozivnih atmosferah. Ta tehnična specifikacija se uporablja za lastnovarne naprave in sisteme, ki uporabljajo elektronsko krmiljeno trajanje isker s ciljem zagotoviti več električne moči ob hkratnem ohranjanju ustrezne ravni varnosti. Ta tehnična specifikacija se uporablja tudi za električno opremo ali dele električne opreme, ki so zunaj nevarnih območjih ali jih varuje še ena vrsta zaščite, navedena v skupini standardov IEC 60079, pri čemer je lahko lastna varnost električnih tokokrogov v eksplozivnih atmosferah odvisna od zasnove in konstrukcije take električne opreme ali delov take električne opreme. Električni tokokrogi v nevarnih območjih se za uporabo na takih mestih ocenjujejo na podlagi te tehnične specifikacije. Ta tehnična specifikacija dopolnjuje in spreminja zahteve standardov IEC 60079-0, IEC 60079-11, IEC 60079-14, IEC 60079-17 in IEC 60079-25.

General Information

Status
Published
Publication Date
13-Jun-2019
Current Stage
6060 - Document made available - Publishing
Start Date
14-Jun-2019
Due Date
04-Mar-2018
Completion Date
14-Jun-2019

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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-
...

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