Explosive atmospheres - Part 39: Intrinsically safe systems with electronically controlled spark duration limitation (IEC/TS 60079-39:2015)

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 (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)

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
03-Dec-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2019
Due Date
05-Sep-2019
Completion Date
04-Dec-2019

RELATIONS

Buy Standard

Technical specification
SIST-TS CLC IEC/TS 60079-39:2020 - BARVE
English language
54 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST-TS CLC IEC/TS 60079-39:2020
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
SIST-TS CLC IEC/TS 60079-39:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
---------------------- Page: 2 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
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
---------------------- Page: 3 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
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.
---------------------- Page: 4 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
CLC IEC/TS 60079-39:2019 (E)
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
---------------------- Page: 5 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
---------------------- Page: 6 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
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

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
– 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

---------------------- Page: 8 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
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-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

---------------------- Page: 9 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
– 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 ...................................................................... 49

Table 1 – Definition of Power-i voltage classes .................................................................... 16

Table 2 – Definition of Power-i current classes .................................................................... 16

Table 3 – Permitted combinations of Power-i application classes for Power-i sources

as a function of the system response time for all Groups (n.a. = not allowed) ....................... 17

Table 4 – Power-i current classes of Power-i field devices or Power-i terminators

matching the current class of the Power-i source ................................................................. 18

Table 5 – Relevance for Power-i test procedures ................................................................. 20

---------------------- Page: 10 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
IEC TS 60079-39:2015 © IEC 2015 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 39: Intrinsically safe systems with electronically
controlled spark duration limitation
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. In

exceptional circumstances, a technical committee may propose the publication of a technical

specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 60079-39, which is a technical specification, has been prepared by subcommittee

31G: Intrinsically safe apparatus, of IEC technical committee 31: Equipment for explosive

atmospheres.
---------------------- Page: 11 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
– 6 – IEC TS 60079-39:2015 © IEC 2015
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
31G/236A/DTS 31G/242/RVC

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60079 series, published under the general title Explosive

atmospheres, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 12 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
IEC TS 60079-39:2015 © IEC 2015 – 7 –
INTRODUCTION

This part of IEC 60079, which is a Technical Specification, is being issued as a “prospective

standard for provisional application” in the field of Explosive Atmospheres – Intrinsically safe

systems with electronically controlled spark duration limitation because there is an urgent

need for guidance on how standards in this field should be used to meet an identified need.

Intrinsically safe systems with electronically controlled spark duration can provide more power

available in intrinsically safe circuits while maintaining the level of protection “ib” or “ic”. In

addition to limiting the voltage and current (similar to conventional intrinsically safe circuits),

the duration of the spark is limited, which also restricts the amount of energy available for

ignition.

The general requirements for the installation of IS equipment are applicable to Power-i

circuits.

This new technology allows an expansion in the field of industrial applications using the type

of protection Intrinsic Safety ‘i.

This technology, however, requires a new and more extensive approach of the type of

protection Intrinsic Safety “i”.
---------------------- Page: 13 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
– 8 – IEC TS 60079-39:2015 © IEC 2015
EXPLOSIVE ATMOSPHERES –
Part 39: Intrinsically safe systems with electronically
controlled spark duration limitation
1 Scope

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 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.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements

IEC 60079-11, Explosive atmospheres – Part 11: Equipment protection by intrinsic safety "i"

IEC 60079-14, Explosive atmospheres – Part 14: Electrical installations design, selection and

erection
---------------------- Page: 14 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
IEC TS 60079-39:2015 © IEC 2015 – 9 –

IEC 60079-25, Explosive atmospheres – Part 25: Intrinsically safe electrical systems

3 Definitions

For the purpose of this document, the terms and definitions given in IEC 60079-0 and

IEC 60079-11, as well as the following apply.
3.1
Power-i

intrinsically safe concept where the level of protection is provided by voltage and current

limitation and additional electronically controlled spark duration limitation
Note 1 to entry: Power-i contains Power-i devices and Power-i wiring.

Note 2 to entry: Power-i encompasses electric circuits which in the Power-i mode operate with voltage and

current values which can exceed the values defined in IEC 60079-11.
3.2
Power-i device
Power-i source, Power-i field device(s) and (if applicable) Power-i terminator
3.3
Power-i terminator

unit to prevent reflections of voltage and current waves at the end of the Power-i wiring

Note 1 to entry: The Power-i terminator is only relevant where data transmission uses the Power-i wiring.

3.4
Power-i source
power supply for Power-i devices providing shutdown of power in case of faults
Note 1 to entry: Operating in two modes: Power-i mode and shutdown mode.
3.5
Power-i field device
device that is connected to one Power-i source via Power-i wiring

Note 1 to entry: Power-i field devices can have additional connections to other devices (e.g. loads).

3.6
Power-i mode
operating mode of the Power-i source delivering the rated Power-i output power

Note 1 to entry: In this mode the values of permitted voltage and current can exceed the values of curves and

tables stated in IEC 60079-11.
3.7
shutdown mode
operating mode of the Power-i source after a spark event has been detected
3.8
spark pulse
information resulting from a spark event in the Power-i system

Note 1 to entry: A distinction is made between the make spark pulse and the break spark pulse.

---------------------- Page: 15 ----------------------
SIST-TS CLC IEC/TS 60079-39:2020
– 10 – IEC TS 60079-39:2015 © IEC 2015
3.9
Power-i response time
3.9
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.