oSIST prEN IEC 60079-28:2024
(Main)Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation
Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation
Explosionsgefährdete Bereiche - Teil 28: Schutz von Geräten und Übertragungssystemen, die mit optischer Strahlung arbeiten
Atmosphères explosives - Partie 28: Protection du matériel et des systèmes de transmission utilisant le rayonnement optique
Eksplozivne atmosfere - 28. del: Zaščita opreme, ki uporablja optično sevanje, in sistemov za prenos optičnega sevanja
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2024
Eksplozivne atmosfere - 28. del: Zaščita opreme, ki uporablja optično sevanje, in
sistemov za prenos optičnega sevanja
Explosive atmospheres - Part 28: Protection of equipment and transmission systems
using optical radiation
Explosionsgefährdete Bereiche - Teil 28: Schutz von Geräten und
Übertragungssystemen, die mit optischer Strahlung arbeiten
Atmosphères explosives - Partie 28: Protection du matériel et des systèmes de
transmission utilisant le rayonnement optique
Ta slovenski standard je istoveten z: prEN IEC 60079-28:2024
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.
31/1793/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-28 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-09-06 2024-11-29
SUPERSEDES DOCUMENTS:
31/1726/CD, 31/1761A/CC
IEC TC 31 : EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
SECRETARIAT: SECRETARY:
United Kingdom Mr Tom Stack
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
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TITLE:
Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical
radiation
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
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31/1793/CDV -2- IEC 60079-28 ED3 © IEC 2024
1 CONTENTS
3 FOREWORD . 4
4 INTRODUCTION . 7
5 1 Scope . 8
6 2 Normative references . 9
7 3 Terms and definitions . 9
8 4 Types of Protection . 12
9 4.1 General . 12
10 4.2 Requirements for inherently safe optical radiation “op is” . 13
11 4.2.1 Continuous wave radiation . 13
12 4.2.2 Pulsed radiation . 14
13 4.2.3 Over-power/energy fault protection . 16
14 4.3 Requirements for protected optical radiation “op pr” . 16
15 4.3.1 General . 16
16 4.3.2 Radiation inside optical fibre or cable . 17
17 4.3.3 Radiation inside enclosures . 17
18 4.4 Optical system with interlock “op sh” . 17
19 5 Type verifications and tests . 18
20 5.1 Optical detector . 18
21 5.2 Optical power . 19
22 5.3 Optical irradiance . 20
23 6 Marking . 20
24 Annex A (informative) Ignition mechanisms . 22
25 Annex B (informative) Typical optical fibre cable design . 27
26 Annex C (informative) Overview for the assessment of pulsed radiation . 28
27 Bibliography . 29
29 Figure 1 – Optical ignition delay times and safe boundary curve with safety factor of 2 . 18
30 Figure A.1 – Minimum radiant igniting power with inert absorber target (
31 =83 %, =93 %) and continuous wave-radiation of 1064 nm . 25
nm 805 nm
32 Figure A.2 – Minimum radiant igniting power with inert absorber target
33 ( nm=83 %, nm=93 %) and continuous wave-radiation (PTB: 1064 nm,
1 064 805
34 HSL: 805 nm, [8]: 803 nm) for some n-alkanes . 26
35 Figure B.1 – Example Multi-Fibre Optical Cable Design For Heavy Duty Applications . 27
36 Figure B.2 – Typical Single Optical Fibre Cable Design . 27
37 Figure C.1 – Flow diagram for the assessment of pulses according to 4.2.2 . 28
39 Table 1 – EPLs achieved by application of Types of Protection for optical systems . 12
40 Table 2 – Safe optical power and irradiance for Group I and II equipment, categorized
41 by Equipment Group and temperature class . 13
42 Table 3 –Safe optical power for Group II equipment for temperature classes T1 to T4 . 14
43 Table 4 – Safe optical power and irradiance for Group III equipment. 14
IEC 60079-28 ED3 © IEC 2024 -3- 31/1793/CDV
44 Table A.1 – AIT (auto ignition temperature), MESG (maximum experimental safe gap)
45 and measured ignition powers of the chosen combustibles for inert absorbers as the
46 target material ( =83 %, =93) . 24
1 064 nm 805 nm
47 Table A.2 – Comparison of measured minimum igniting optical pulse energy
i,min
48 (Q ) at 90 m beam diameter with auto ignition temperatures (AIT) and
e,p
49 minimum ignition energies (MIE) from literature [9] at concentrations in percent by
50 volume () . 26
31/1793/CDV -4- IEC 60079-28 ED3 © IEC 2024
54 INTERNATIONAL ELECTROTECHNICAL COMMISSION
55 ____________
57 EXPLOSIVE ATMOSPHERES –
59 Part 28: Protection of equipment and transmission
60 systems using optical radiation
64 FOREWORD
65 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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94 indispensable for the correct application of this publication.
95 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
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97 International Standard IEC 60079-28 has been prepared by MT 60079-28, of IEC technical
98 committee 31 Equipment for explosive atmospheres.
99 This third edition cancels and replaces the second edition published in 2015. This edition
100 constitutes a technical revision.
101 Users of this document are advised that interpretation sheets clarifying the interpretation of this
102 document can be published. Interpretation sheets are available from the IEC webstore and can
103 be found in the “history” tab of the page for each document.
104 The significance of the changes between IEC 60079-28, Edition 3 and IEC 60079-28, Edition 2
105 is as listed below:
IEC 60079-28 ED3 © IEC 2024 -5- 31/1793/CDV
106 Significance of changes with respect to IEC 60079-28:2015
Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
Ignition test is removed 5.4 to 5.7;
Annex A
C1
(of Ed.2)
Clarification of the applicability of IEC 60079-28 for laser
equipment, optical fibre equipment and any optical system
1 X
that converts light into convergent beams with focal points
within the hazardous area only.
The structure of this document was modified; new clause
5 X
“Type verifications and tests” added
New subclause “Optical detector” 5.1 X
The possibility to do calculations for the assessment of
5.2 X
optical power is clarified
Additional examples for the marking are added. 6 X
107 NOTE 1 The technical changes referred to include the significance of technical changes in the revised IEC
108 Standard, but they do not form an exhaustive list of all modifications from the previous version. More guidance may
109 be found by referring to the Redline Version of the standard.
Explanation of the Types of Significant Changes:
A) Definitions
1) Minor and editorial clarification
changes:
decrease of technical requirements
minor technical 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 technical 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 conformity with the preceding edition.
3) Major technical changes: addition of technical requirements
increase of technical requirements
These are changes to technical requirements (addition, i
...
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