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

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 follows besides the structural adjustments and editorial modifications:
--- Integrate the requirements of equipment for combustible dust environment in GB 12476.4-2010;
--- Integrate the requirements of FISCO equipment in GB 3836.19-2010 (see Annex by Intrinsic Safety "i";
--- Delete the NOTE about standard version information in Table 1;
--- Add a NOTE about the terminology of the early version of 3.1.2 "Associated Device";
--- Added a NOTE about the terminology of the early version of 3.1.5 "Simple Device";
--- Add NOTE 2 on the arrangement of intrinsically safe conductors and non- intrinsically safe conductors in 6.3.12;
--- Add a NOTE about the intrinsically safe circuit ground wire of Group I electrical equipment as a loop in 6.5;
---Adjust the numbers of Table 10~Table 11 in IEC 60079-11:2011 into Table 9~Table 10;
--- Add formula number;
--- Adjust the NOTEs in Table F.1 into the form of footnotes;
--- Include the technical corrigendum content of IEC 60079-11:2011/COR1:2012, and the outer margins of the clauses involved are marked with a vertical double line (‖);
--- Modify the Bibliography.
Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by China Electrical Equipment Industry Association. This Document shall be under the jurisdiction of National Technical Committee on Explosion Protected Electrical Apparatus of Standardization of China (SAC/TC 9). Drafting organizations of this Document: Nanyang Flameproof Electrical Research Institute Co., Ltd.; Shanghai Inspection and Testing Institute of Instruments and Automation Systems Co., Ltd.; CCTEG Shenyang Research Institute; CCTEG
Chongqing Research Institute; Hanwei Electronics Group Corporation; Tianjin Sure Instrument Co., Ltd.; Shenzhen Maxonic Automation Control Co., Ltd.; Beijing Sanki United Petroleum Technology Co., Ltd.; Gulf Security Technology Co., Ltd.; Nanjing New Power Electric Co., Ltd.; Shanghai Institute of Quality Inspection and Technical Research; SUNLEEM Technology Incorporated Company; Warom Technology
Incorporated Company; and Jinan Changqing Computer Application Co., Ltd. Chief drafting staffs of this Document: Zhang Gang, Xu Jianping, Wang Xitong, Li Explosive Atmospheres – Part 4:
Equipment Protection by Intrinsic Safety “i”
1 Scope
This document 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 an explosion in the surrounding explosive atmospheres.
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 GB/T 3836.1-2021, 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 evaluated for use in such an atmosphere by applying this standard.
The requirements for intrinsically safe systems are provided in GB/T 3836.18. This Standard supplements and modifies the general requirements of GB/T 3836.1- 2021, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of GB/T 3836.1-2021, the requirements of this standard shall take precedence.
If requirements in this standard are applicable to both intrinsically safe apparatus and associated apparatus the term “apparatus” is used throughout the standard. This standard is for electrical equipment only; therefore the term “equipment” used in the standard always means “electrical equipment”.
If associated apparatus is placed in the explosive atmosphere, it shall be protected by an appropriate Type of Protection listed in GB/T 3836.1-2021, and then the requirements of that method of protection together with the relevant parts of GB/T 3836.1-2021 also apply to the associated apparatus.

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