kSIST FprEN 60079-11:2022
(Main)Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
This part of IEC 60079 specifies the construction and testing of intrinsically safe apparatus intended for use in an explosive atmosphere, and for associated apparatus which is intended for connection to intrinsically safe circuits which enter such atmospheres.
This Type of Protection is applicable to electrical equipment in which the electrical circuits themselves are incapable of causing ignition of a surrounding explosive atmosphere. This includes electrical equipment which contains circuits that are intrinsically safe only under certain conditions, for example under battery supply with mains supply removed.
This standard is also applicable to electrical equipment or parts of electrical equipment located outside the explosive atmosphere or protected by another Type of Protection listed in IEC 60079-0, where the intrinsic safety of the electrical circuits in the explosive atmosphere may depend upon the design and construction of such electrical equipment or parts of such electrical equipment. The electrical circuits exposed to the explosive atmosphere are assessed for use in such an atmosphere by applying this standard.
This standard applies to sensors connected to intrinsically safe circuits but does not apply to the protection of catalytic elements for Group IIC or Group IIB + H2.
The requirements for intrinsically safe systems are provided in IEC 60079-25.
This standard supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.
Unless otherwise stated, the requirements in this standard are applicable to both intrinsically safe apparatus and associated apparatus, and the generic term "apparatus" is used throughout the standard.
As this standard applies only to electrical equipment, the term "equipment" used in the standard always means “electrical equipment”.
This standard applies to apparatus for use under the atmospheric conditions of IEC 60079-0 with additional requirements for for use at lower atmospheric pressures in the range from 60 kPa (0,6 bar), up to 110 kPa (1,1 bar).
[...]
Explosionsgefährdete Bereiche - Teil 11: Geräteschutz durch Eigensicherheit "i"
Atmosphères explosives - Partie 11: Protection de l'équipement par sécurité intrinsèque "i"
IEC 60079-11:2023 spécifie la construction et les essais pour le matériel électrique de sécurité intrinsèque destiné à être utilisé dans les atmosphères explosives et pour le matériel électrique associé destiné à être relié à des circuits de sécurité intrinsèque qui entrent dans de telles atmosphères.
Ce mode de protection s’applique à l’appareil électrique dont les circuits électriques sont eux mêmes incapables de provoquer une inflammation dans l’atmosphère explosive environnante. Il inclut l’appareil électrique qui contient des circuits qui sont de sécurité intrinsèque uniquement dans certaines conditions, par exemple alimentés par batterie et alimentation réseau coupée.
Le présent document s’applique également à l’appareil électrique ou aux parties d’appareil électrique situés hors de l’atmosphère explosive ou protégés par un autre mode de protection cité dans l’IEC 60079 0, si la sécurité intrinsèque des circuits électriques situés dans l’atmosphère explosive peut dépendre de la conception et de la construction de cet appareil électrique ou de ces parties d’appareil électrique. Les circuits électriques exposés à une atmosphère explosive sont évalués en vue de leur emploi dans de telles atmosphères en appliquant le présent document.
Le présent document s’applique aux capteurs reliés à des circuits de sécurité intrinsèque, mais elle ne s’applique pas à la protection d’éléments catalytiques pour le Groupe IIC ou le Groupe IIB + H2.
Le présent document ne s’applique pas aux entrées de câbles d’appareils Ex.
Les exigences pour les circuits de sécurité intrinsèque sont fournies dans l’IEC 60079-25.
Le présent document complète et modifie les exigences générales de l’IEC 60079-0. Si une exigence du présent document entre en conflit avec une exigence de l’IEC 60079-0, l’exigence du présent document prévaut.
Sauf indication contraire, les exigences du présent document s’appliquent au matériel de sécurité intrinsèque et au matériel associé, et le terme générique "matériel" est utilisé dans toute la norme.
Comme le présent document s’applique uniquement à l’appareil électrique, le terme "appareil" utilisé dans la norme signifie toujours "appareil électrique".
Le présent document s’applique au matériel à utiliser dans les conditions atmosphériques de l’IEC 60079-0 avec les exigences supplémentaires pour son utilisation à des pressions atmosphériques supérieures comprises entre 60 kPa (0,6 bar) et 110 kPa (1,1 bar).
Cette septième édition annule et remplace la sixième édition parue en 2011. Cette édition constitue une révision technique
L'identification et la signification des changements entre la CEI 60079-11, Édition 7 (2022) et la CEI 60079-11, Édition 6 (2011 + Corrigendum 1 (2012)) peuvent être trouvées dans le tableau des modifications dans l'avant-propos de la publication
Eksplozivne atmosfere - 11. del: Zaščita opreme z lastno varnostjo "i"
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 60079-11:2021
01-januar-2021
Eksplozivne atmosfere - 11. del: Zaščita opreme z lastno varnostjo "i"
Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
Explosionsgefährdete Bereiche - Teil 11: Geräteschutz durch Eigensicherheit "i"
Atmosphères explosives - Partie 11: Protection de l'équipement par sécurité intrinsèque
"i"
Ta slovenski standard je istoveten z: prEN 60079-11:2020
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
oSIST prEN 60079-11:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 60079-11:2021
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oSIST prEN 60079-11:2021
31G/327/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-11 ED7
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2020-11-06 2021-01-29
SUPERSEDES DOCUMENTS:
31G/291/CD, 31G/297A/CC
IEC SC 31G : INTRINSICALLY-SAFE APPARATUS
SECRETARIAT: SECRETARY:
United Kingdom Mr Nicholas Ludlam
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 18,SC 31J
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
TITLE:
Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
The attached CDV includes significant changes from Edition 6 including a restructure and new technical
elements. It is requested that NCs hold any new items until completion of Edition 7.
Copyright © 2020 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this 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 permission in writing from IEC.
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The list of 'significance of differences' in the Foreword will be circulated as a separate INF document.
Due to the nature of changes between this CDV and IEC 60079-11 Ed 6 a redline comparison is not
being circulated.
1
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31G/327/CDV – 2 – IEC CDV 60079-11 IEC:2020
2 CONTENTS
3 FOREWORD . 10
4 1 Scope . 13
5 2 Normative references . 24
6 3 Terms, definitions and abbreviated terms . 25
7 3.1 Terms and definitions. 25
8 3.2 Abbreviated terms . 29
9 4 Grouping, classification and Levels of Protection of apparatus . 30
10 5 Levels of Protection and ignition compliance requirements . 30
11 5.1 General . 30
12 5.2 Conditions for assessment . 31
13 5.2.1 General . 31
14 5.2.2 Level of Protection "ia" . 31
15 5.2.3 Level of Protection "ib" . 32
16 5.2.4 Level of Protection “ic” . 32
17 5.2.5 Non-shock hazard equipment or systems . 32
18 5.3 Spark ignition compliance . 33
19 5.3.1 General . 33
20 5.3.2 Levels of Protection “ia” and “ib” . 34
21 5.3.3 Level of Protection “ic” . 34
22 5.3.4 Application of safety factors . 34
23 5.3.5 Circuits without controlled semiconductor limitation . 35
24 5.3.6 Circuits with controlled semiconductor limitation . 35
25 5.4 Thermal ignition compliance. 36
26 5.4.1 General . 36
27 5.4.2 Temperature of small components for Group I and Group II . 37
28 5.4.3 Wiring within intrinsically safe apparatus for Group I and Group II . 37
29 5.4.4 PCB tracks for Group I and Group II . 38
30 5.4.5 Intrinsically safe apparatus and component temperature for dusts . 40
31 5.5 Simple apparatus . 40
32 6 Apparatus construction . 41
33 6.1 General . 41
34 6.2 Enclosures . 41
35 6.2.1 General . 41
36 6.2.2 Apparatus complying with Table 7 . 42
37 6.2.3 Apparatus complying with Table 8 or Table 9 . 42
38 6.2.4 Enclosures for Group IIIC intrinsically safe apparatus . 42
39 6.3 Connection facilities for external circuits . 43
40 6.3.1 Terminals . 43
41 6.3.2 Plugs and sockets . 45
42 6.3.3 Permanently connected cable . 45
43 6.3.4 Connections and accessories for intrinsically safe apparatus when
44 located in the non-hazardous area . 46
45 6.4 Internal connections and connectors . 47
46 6.4.1 General . 47
47 6.4.2 Infallible connections . 47
48 6.4.3 Connectors for internal connections, plug-in cards and components . 49
49 6.4.4 Earth conductors and connections . 49
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50 6.5 Separation of conductive parts . 49
51 6.5.1 Separations on which intrinsic safety depends . 49
52 6.5.2 Separation distances according to Table 7 . 50
53 6.5.3 Reduced separation distances . 50
54 6.5.4 Failure of separations . 51
55 6.5.5 Voltage between conductive parts . 57
56 6.5.6 Types of separation . 57
57 6.5.7 Composite separations . 64
58 6.5.8 Printed circuit board assemblies . 65
59 6.5.9 Separation by metal parts . 66
60 6.5.10 Separation by non-metallic insulating partitions . 67
61 6.5.11 Insulation of internal wiring . 67
62 6.6 Encapsulation . 67
63 6.6.1 General . 67
64 6.6.2 Encapsulation used for the exclusion of explosive atmospheres . 69
65 6.6.3 Mechanical protection to avoid access to parts . 71
66 6.6.4 Encapsulation used for protection of a fuse. . 71
67 6.6.5 Encapsulation used to provide separation . 71
68 6.6.6 Encapsulation used to enhance the rating of protective components . 72
69 6.6.7 Free space within the encapsulation . 72
70 6.7 Specification of coating, encapsulation and moulding materials . 73
71 6.7.1 General . 73
72 6.7.2 Coating materials . 73
73 6.7.3 Materials used for encapsulation . 74
74 6.7.4 Plastic materials used for moulding . 74
75 6.8 Protection against polarity reversal . 74
76 6.9 Dielectric strength requirement . 74
77 7 Characteristics and failure of components and assemblies . 75
78 7.1 Rating of components on which intrinsic safety depends . 75
79 7.2 Failure of components . 75
80 7.3 Manufacturing variation . 75
81 7.4 Resistors . 76
82 7.4.1 General . 76
83 7.4.2 Resistors on which intrinsic safety depends . 76
84 7.5 Capacitors . 77
85 7.5.1 General . 77
86 7.5.2 Capacitors on which intrinsic safety depends . 77
87 7.5.3 Blocking capacitors . 78
88 7.5.4 Infallible filter capacitors . 78
89 7.6 Inductors and windings . 78
90 7.6.1 General . 78
91 7.6.2 Inductors on which intrinsic safety depends . 79
92 7.6.3 Infallibly insulated inductors . 79
93 7.6.4 Damping windings . 80
94 7.6.5 Common mode choke coils (EMI suppression filters) . 80
95 7.7 Semiconductors . 80
96 7.7.1 General . 80
97 7.7.2 Semiconductors on which intrinsic safety depends. 81
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98 7.7.3 Transient effects on semiconductors on which intrinsic safety depends . 81
99 7.7.4 Semiconductors in shunt voltage limiters . 82
100 7.7.5 Shunt assembly on which intrinsic safety depends . 82
101 7.7.6 Infallible assemblies on which intrinsic safety depends . 82
102 7.7.7 Semiconductor current limiters . 83
103 7.8 Transformers . 83
104 7.8.1 General . 83
105 7.8.2 Transformers on which intrinsic safety depends . 83
106 7.8.3 Construction of transformers on which intrinsic safety depends . 83
107 7.8.4 Protective measures for transformers on which intrinsic safety depends
108 for Levels of Protection “ia” and “ib” . 84
109 7.8.5 Requirements for transformers for Level of Protection “ic” . 85
110 7.9 Relays . 85
111 7.9.1 General . 85
112 7.9.2 Relays on which intrinsic safety depends . 85
113 7.10 Signal isolators . 86
114 7.10.1 General . 86
115 7.10.2 Signal isolators on which intrinsic safety depends. 86
116 7.10.3 Signal isolators between intrinsically safe and non-intrinsically safe
117 circuits . 87
118 7.10.4 Signal isolators between separate intrinsically safe circuits . 87
119 7.11 Fuses . 87
120 7.12 Primary and secondary cells and batteries . 88
121 7.12.1 General . 88
122 7.12.2 Construction of cells and batteries used in intrinsically safe apparatus . 89
123 7.12.3 Electrolyte leakage . 89
124 7.12.4 Ventilation . 89
125 7.12.5 Cell voltages . 90
126 7.12.6 Batteries in equipment protected by other Types of Protection . 90
127 7.12.7 Batteries used and replaced in explosive atmospheres . 90
128 7.12.8 Replaceable batteries used but not replaced in explosive atmospheres . 90
129 7.12.9 External contacts for charging batteries . 91
130 7.13 Piezo-electric devices . 91
131 7.14 Cells for the detection of gases . 91
132 7.14.1 Electrochemical . 91
133 7.14.2 Catalytic . 91
134 7.15 Supercapacitors . 91
135 7.16 Thermal devices . 92
136 7.16.1 General . 92
137 7.16.2 Thermal devices used to limit temperature . 92
138 7.16.3 Thermal devices used to limit current . 93
139 8 Supplementary requirements for specific apparatus . 94
140 8.1 Diode safety barriers . 94
141 8.1.1 General . 94
142 8.1.2 Construction . 94
143 8.2 FISCO apparatus . 94
144 9 Type verifications and type tests . 94
145 9.1 Spark ignition test . 94
146 9.1.1 General . 94
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147 9.1.2 Spark test apparatus and its use. 95
148 9.1.3 Test gas mixtures and spark test apparatus calibration current . 95
149 9.2 Spark ignition assessment using reference curves and tables . 96
150 9.2.1 General . 96
151 9.2.2 Assessment of simple resistive circuit . 97
152 9.2.3 Assessment of simple capacitive circuits . 97
153 9.2.4 Assessment of Simple Inductive Circuits . 100
154 9.2.5 Determination of maximum external inductance to resistance ratio
155 (L /R ) for resistance limited power source . 100
o o
156 9.2.6 Circuits with both inductance and capacitance . 101
157 9.3 Temperature tests . 102
158 9.4 Dielectric strength tests . 102
159 9.5 Determination of parameters of loosely specified components . 102
160 9.6 Tests for cells, batteries and supercapacitors . 103
161 9.6.1 General . 103
162 9.6.2 Electrolyte leakage test for cells, batteries and supercapacitors . 103
163 9.6.3 Spark ignition and surface temperature of cells, batteries or
164 supercapacitors . 104
165 9.6.4 Battery container pressure tests . 105
166 9.7 Qualification of reduced distances for solid insulation and distance through
167 casting compound . 106
168 9.7.1 General . 106
169 9.7.2 Preconditioning . 106
170 9.7.3 AC power frequency voltage test . 107
171 9.7.4 Partial discharge test . 107
172 9.8 Mechanical tests . 108
173 9.8.1 Casting compound . 108
174 9.8.2 Determination of the acceptability of fuses requiring encapsulation . 108
175 9.8.3 Partitions . 109
176 9.8.4 Cable pull test . 109
177 9.9 Tests for intrinsically safe apparatus containing piezoelectric devices . 109
178 9.10 Type tests for components protected by time dependent current limitation . 109
179 9.11 Current carrying capacity of infallible printed circuit board connections . 110
180 9.12 Transformer tests . 111
181 9.12.1 General . 111
182 9.12.2 Mains transformers for Level of Protection “ia” and “ib” . 111
183 9.12.3 Transformers galvanically isolated from the mains supply for Levels of
184 Protection “ia” and “ib” . 112
185 9.12.4 Transformers for Level of Protection “ic” . 112
186 9.13 Isolator tests . 112
187 9.13.1 General . 112
188 9.13.2 Thermal conditioning and dielectric test . 112
189 9.13.3 Dielectric and short-circuit test . 113
190 9.14 Differential Leakage current tests for signal isolators . 114
191 9.15 Determination of storable energy in common mode chokes . 115
192 9.16 Tests for PTCs . 116
193 10 Routine verifications and tests . 116
194 10.1 Routine tests for diode safety barriers . 116
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195 10.1.1 Completed barriers . 116
196 10.1.2 Diodes for 2-diode “ia” barriers . 116
197 10.2 Routine tests for transformers . 116
198 10.2.1 Levels of Protection “ia” and “ib” . 116
199 10.2.2 Level of Protection “ic” . 117
200 10.3 Routine verification . 117
201 11 Marking . 118
202 11.1 Intrinsically safe apparatus and associated apparatus. 118
203 11.1.1 General . 118
204 11.1.2 Electrical parameters . 118
205 11.1.3 FISCO . 118
206 11.1.4 Marking of connection facilities . 118
207 11.1.5 Non-hazardous area accessory . 118
208 11.2 Warning markings . 119
209 12 Instructions . 119
210 12.1 General . 119
211 12.2 Specific Conditions of Use . 119
212 Annex A (normative) Spark ignition reference curves . 121
213 Annex B (normative) Spark test apparatus for intrinsically safe circuits . 149
214 B.1 Principle . 149
215 B.2 Spark test apparatus . 149
216 B.3 Spark test apparatus sensitivity . 150
217 B.4 Preparation and cleaning of tungsten wires . 150
218 B.5 Conditioning a new cadmium disc . 150
219 B.6 Limitations of the spark test apparatus . 151
220 B.7 Modification of spark test apparatus for use at higher currents . 151
221 Annex C (informative) Measurement of creepage distances, clearances and
222 separation distances through casting compound and through solid insulation . 156
223 C.1 Clearances and separation distances through casting compound and
224 through solid insulation . 156
225 C.2 Creepage distances . 157
226 C.3 Examples for the application of an ambient pressure correction factor . 158
227 Annex D (normative) Excess transient energy test . 160
228 D.1 Int
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