GB/T 3836.4-2021 English PDF (GBT3836.4-2021)

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GB/T 3836.4-2021: Explosive atmospheres -- Part 4: Equipment protection by intrinsic safety "i"
GB/T 3836.4-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.4-2010, GB 3836.19-2010, GB 12476.4-2010
Explosive Atmospheres – Part 4:
Equipment Protection by Intrinsic Safety “i”
(IEC 60079-11:2011, Explosive Atmospheres
– Part 11: Equipment Protection by Intrinsic Safety “i”, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 5
Introduction ... 11
1 Scope ... 14
2 Normative References ... 21
3 Terms and Definitions ... 22
4 Grouping and Classification of Intrinsically Safe Apparatus and Associated
Apparatus ... 28
5 Levels of Protection and Ignition Compliance Requirements of Electrical
Apparatus ... 28
5.1 General ... 28
5.2 Level of protection "ia" ... 29
5.3 Level of protection "ib" ... 30
5.4 Level of protection "ic" ... 30
5.5 Spark ignition compliance ... 30
5.6 Thermal ignition compliance ... 31
5.7 Simple apparatus ... 35
6 Apparatus Construction ... 36
6.1 Enclosures ... 36
6.2 Facilities for connection of external circuits ... 38
6.3 Separation distances ... 44
6.4 Protection against polarity reversal ... 55
6.5 Earth conductors, connections and terminals ... 55
6.6 Encapsulation ... 56
7 Components on which Intrinsic Safety Depends ... 58
7.1 Rating of components ... 58
7.2 Connectors for internal connections, plug-in cards and components ... 59
7.3 Fuses ... 59
7.4 Primary and secondary cells and batteries ... 61
7.5 Semiconductors ... 65
7.6 Failure of components, connections and separations ... 66
7.7 Piezo-electric devices ... 68
7.8 Electrochemical cells for the detection of gases ... 68
8 Infallible Components, Infallible Assemblies of Components and Infallible
Connections on which Intrinsic Safety Depends ... 68
8.1 Level of Protection “ic” ... 68
8.2 Mains transformers ... 68
8.3 Transformers other than mains transformers ... 71
8.4 Infallible windings ... 71
8.5 Current-limiting resistors ... 72
8.6 Capacitors ... 73
8.7 Shunt safety assemblies ... 74
8.8 Wiring, printed circuit board tracks, and connections ... 76
8.9 Galvanically separating components... 77
9 Supplementary Requirements for Specific Apparatus ... 78
9.1 Diode safety barriers ... 78
9.2 FISCO apparatus ... 79
9.3 Handlights and caplights ... 79
10 Type Verifications and Type Tests ... 80
10.1 Spark ignition test ... 80
10.2 Temperature tests ... 86
10.3 Dielectric strength tests ... 86
10.4 Determination of parameters of loosely specified components ... 87
10.5 Tests for cells and batteries ... 87
10.6 Mechanical tests ... 90
10.7 Tests for intrinsically safe apparatus containing piezoelectric devices ... 91
10.8 Type tests for diode safety barriers and safety shunts ... 91
10.9 Cable pull test ... 92
10.10 Transformer tests ... 92
10.11 Optical isolators tests ... 93
10.12 Current carrying capacity of infallible printed circuit board connections .. 96
11 Routine Verifications and Tests ... 96
11.1 Routine tests for diode safety barriers ... 96
11.2 Routine tests for infallible transformers ... 96
12 Marking ... 97
12.1 General ... 97
12.2 Marking of connection facilities ... 98
12.3 Warning markings ... 99
12.4 Examples of marking ... 99
13 Documentation ... 100
Annex A (Normative) Assessment of Intrinsically Safe Circuits ... 102
Annex B (Normative) Spark Test Apparatus for Intrinsically Safe Circuits ... 134
Annex C (Informative) Measurement of Creepage Distances, Clearances and
Separation Distances through Casting Compound and through Solid Insulation
... 143
Annex D (Normative) Encapsulation ... 147
Annex E (Informative) Transient Energy Test ... 154
Annex F (Normative) Alternative Separation Distances for Assembled Printed
Circuit Boards and separation of Components ... 157
Annex G (Normative) Fieldbus Intrinsically Safe Concept (FISCO) – Apparatus
Requirements ... 162
Annex H (Informative) Ignition Testing of Semiconductor Limiting Power Supply
Circuits ... 169
Bibliography ... 181
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1: Rules for the Structure and Drafting of Standardizing
Documents.
This Document is Part 4 of GB/T 3836 Explosive Atmospheres. GB/T 3836 has
published the following parts:
--- Part 1: Equipment – General Requirements;
--- Part 2: Equipment Protection by Flameproof Enclosure “d”;
--- Part 3: Equipment Protection by Increased Safety “e”;
--- Part 4: Equipment Protection by Intrinsic Safety “i”;
--- Part 5: Equipment Protection by pressurized Enclosure “p”;
--- Part 6: Equipment Protection by Liquid Immersion “o”;
--- Part 7: Equipment Protection by Powder Filling “q”;
--- Part 8: Equipment Protection by Type of Protection “n”;
--- Part 9: Equipment Protection by Encapsulation “m”;
--- Part 11: Material Characteristics for Gas and Vapour Classification - Test
Methods and Data;
--- Part 12: Material Characteristics for Combustible Dusts - Test Methods;
--- Part 13: Equipment Repair, Overhaul, Reclamation and Modification;
--- Part 14: Classification of Areas - Explosive Gas Atmosphere;
--- Part 15: Electrical Installations Design, Selection and Erection;
--- Part 16: Electrical Installations Inspection and Maintenance;
--- Part 17: Equipment Protection by Pressurized Room “p” and Artificially Ventilated
Room “v”;
--- Part 18: Intrinsically Safe Electrical Systems;
--- Part 20: Equipment with Equipment Protection Level (EPL) Ga;
--- Part 21: Application of Quality Systems for Equipment Manufacture;
--- Part 22: Protection of Equipment and Transmission System Using Optical
Radiation;
--- Part 23: Group I, Category EPL Ma Equipment Intended to Remain Functional in
Atmospheres Endangered by Firedamp and/or Coal Dust;
--- Part 24: Equipment Protection by Special Protection “s”;
--- Part 25: Requirements for Process Sealing between Flammable Process Fluids
and Electrical Systems;
--- Part 26: Electrostatic Hazards – Guidance;
--- Part 27: Electrostatic Hazards – Test;
--- Part 28: Non-Electrical Equipment for Explosive Atmospheres - Basic Method
and Requirements;
--- Part 29: Non-Electrical Equipment for Explosive Atmospheres - Constructional
Safety “c”, Control of Ignition Source “b”, Liquid Immersion “k”;
--- Part 30: Equipment and Components in Explosive Atmospheres in Underground
Mines;
--- Part 31: Equipment Dust Ignition Protection by Enclosure “t”;
--- Part 32: Intrinsically Safe Systems with Electronically Controlled Spark Duration
Limitation;
--- Part 33: Equipment in Adverse Service Conditions;
--- Part 34: Equipment Assemblies;
--- Part 35: Classification of Areas for Explosive Dust Atmospheres.
This Document replaced GB 3836.4-2010 Explosive Atmospheres - Part 4: Equipment
Protection by Intrinsic Safety “i”, GB 3836.19-2010 Explosive Atmospheres - Part 19:
Fieldbus Intrinsically Safe Concept (FISCO), and GB 12476.4-2010 Electrical
Apparatus for Use in the Presence of Combustible Dust - Part 4: Protection by Intrinsic
Safety “iD”. Mainly based on GB 3836.4-2010, this Document integrated the major
contents of GB 3836.19-2010 and GB 12476.4-2010. Compared with GB 3836.4-2010,
this Documents had the major technical changes as fo...