GB/T 3836.4-2021 PDF English
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| GB/T 3836.4-2021 | English | 1605 |
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Explosive atmospheres - Part 4: Equipment protection by intrinsic safety 'i'
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| GB 3836.4-2010 | English | 140 |
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[Replaced by GB/T 3836.4-2021] Explosive atmospheres -- Part 4: Equipment protection by intrinsic safety i
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| GB 3836.4-2000 | English | RFQ |
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Electrical apparatus for explosive gas atmospheres. Part 4: Intrinsic safety“i”
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| GB 3836.4-1983 | English | RFQ |
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Electrical apparatus for explosive atmospheres--Intrinsically safe circuits and electrical apparatusi
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GB/T 3836.4-2021: Explosive atmospheres - Part 4: Equipment protection by intrinsic safety 'i'---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3836.4-2021
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
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
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.
2 Normative References
The provisions in following documents become the provisions of this Document
through reference in this Document. For the dated documents, only the versions with
the dates indicated are applicable to this Document; for the undated documents, only
the latest version (including all the amendments) is applicable to this Document.
GB/T 3836.1-2021 Explosive atmospheres - Part 1.Equipment - General
requirements (IEC 60079-0.2017, MOD)
GB/T 3836.3 Explosive Atmospheres - Part 3.Equipment Protection by Increased
Safety “e” (GB/T 3836.3-2021, IEC 60079-7.2015, MOD)
GB/T 3836.18 Explosive atmospheres - Part 18.Intrinsically safe electrical
systems (GB/T 3836.18-2017, IEC 60079-25.2010, MOD)
GB/T 4207 Method for the determination of the proof and the comparative tracking
indices of solid insulating materials (GB/T 4207-2012, IEC 60112.2009, IDT)
GB/T 4208 Degrees of Protection Provided by Enclosure (IP Code) (GB/T 4208-
2017, IEC 60529.2013, IDT)
GB/T 6109.2 Enamelled round winding wire - Part 2.Polyester enamelled round
copper wire class 155 (GB/T 6109.2-2008, IEC 60317-3.2004, IDT)
GB/T 6109.5 Enamelled round winding wire - Part 5.Polyesterimide enamelled
round copper wire class 180 (GB/T 6109.5-2008, IEC 60317-8.1997, IDT)
GB/T 6109.6 Enamelled round winding wire - Part 6.Polyimide enamelled round
copper wire class 220 (GB/T 6109.6-2008, IEC 60317-7.1997, IDT)
GB/T 6109.20 Enamelled round winding wire - Part 20.Polyester on
polyesterimide overcoated with polyamide-imide enamelled round copper wire
class 200 (GB/T 6109.20-2008, IEC 60317-13.1997, IDT)
GB/T 7957 General Requirements for Construction, Performance and Explosion
Protected Testing of Caplights for Use in Mines Susceptible to Firedamp (GB/T
7957-2017, IEC 60079-35-1.2011, IEC 60079-35-2.2011, NEQ)
GB/T 9364 (all parts) Miniature fuses [IEC 60127 (all parts)]
GB/T 11021 Electrical insulation -Thermal evaluation and designation (GB/T
11021-2014, IEC 60085.2007, IDT)
GB/T 16657.2 Industrial communication networks - Fieldbus specifications - Part
2.Physical layer specification and service definition (GB/T 16657.2-2008, IEC
61158-2.2007, IDT)
GB/T 16935.1 Insulation Coordination for Equipment within Low-Voltage Systems
- Part 1.Principles Requirements and Tests (GB/T 16935.1-2008, IEC 60664-
1.2007, IDT)
GB/T 16935.3 Insulation coordination for equipment within low-voltage systems -
Part 3.Use of coating, potting or moulding for protection against pollution (GB/T
16935.3-2016, IEC 60664-3.2010, IDT)
ANSI/UL 248-1 Low-voltage fuses – Part 1.General requirements
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 3836.1-
2021 and the following apply.
3.1 General
3.1.1 Intrinsic safety “i”
Type of protection based on the restriction of electrical energy within equipment and of
interconnecting wiring exposed to the explosive atmosphere to a level below that which
can cause ignition by either sparking or heating effects.
3.1.2 Associated apparatus
Electrical equipment which contains both intrinsically safe circuits and non-intrinsically
safe circuits and is constructed so that the non-intrinsically safe circuits cannot
adversely affect the intrinsically safe circuits.
NOTE 1.Associated apparatus may be either.
a) electrical equipment which has another type of protection listed in GB/T 3836.1-2021 for
use in the appropriate explosive atmosphere, or
b) electrical equipment not so protected and which, therefore, is not normally used within an
explosive atmosphere, for example a recorder which is not itself in an explosive
atmosphere, but is connected to a thermocouple situated within an explosive atmosphere
where only the recorder input circuit is intrinsically safe.
Electrical equipment in which all the circuits are intrinsically safe circuits.
3.1.4 Intrinsically safety circuit
Circuit in which any spark or any thermal effect produced in the conditions specified in
this standard, which include normal operation and specified fault conditions, is not
capable of causing ignition of a given explosive atmosphere.
3.1.5 Simple apparatus
Electrical component or combination of components of simple construction with well-
defined electrical parameters and which is compatible with the intrinsic safety of the
circuit in which it is used.
NOTE. In the earlier versions of this Document, this term was “simple equipment”.
3.2 Coating
Insulating material such as varnish or dry film laid on the surface of the assembly.
NOTE. Coating and base material of a printed board form an insulating system that may have
properties similar to solid insulation.
3.3 Conformal coating
Electrical insulating material applied as a coating to loaded printed circuit boards to
produce a thin layer conforming to the surface in order to provide a protective barrier
against deleterious effects from environmental conditions.
3.4 Control drawing
Drawing or other document that is prepared by the manufacturer for the intrinsically
safe or associated apparatus, detailing the electrical parameters to allow for
interconnections to other circuits or apparatus.
3.5 Diode safety barrier
Assemblies incorporating shunt diodes or diode chains (including Zener diodes)
protected by fuses or resistors or a combination of these, manufactured as an
individual apparatus rather than as part of a larger apparatus.
3.6 Entity concept
Method used to determine acceptable combinations of intrinsically safe apparatus and
associated apparatus through the use of intrinsically safe parameters assigned to
connection facilities.
3.7 Faults
4 Grouping and Classification of Intrinsically Safe
Apparatus and Associated Apparatus
Intrinsically safe and associated apparatus which has a type of protection listed in GB/T
3836.1-2021 for use in the appropriate explosive atmosphere, shall be grouped in
accordance with equipment grouping requirements of GB/T 3836.1-2021 and shall
have a maximum surface temperature or temperature class assigned in accordance
with the temperature requirements of GB/T 3836.1-2021
Associated apparatus which has no such type of protection listed in GB/T 3836.1-2021
shall only be grouped in accordance with the equipment grouping requirements of
GB/T 3836.1-2021.
5 Levels of Protection and Ignition Compliance
Requirements of Electrical Apparatus
5.1 General
Intrinsically safe apparatus and intrinsically safe parts of associated apparatus shall be
placed in Levels of Protection "ia", "ib" or “ic”.
The requirements of this standard shall apply to all levels of protection unless
otherwise stated. In the determination of level of protection “ia", "ib" or “ic”, failure of
components and connections shall be considered in accordance with 7.6.Failure of
separations between conductive parts shall be considered in accordance with 6.3.The
determination shall include opening, shorting and earthing of the external intrinsically
safe connection facilities in accordance with 6.2.
6 Apparatus Construction
NOTE. The requirements given in this clause apply, unless otherwise stated in the relevant
subclauses, only to those features of intrinsically safe apparatus and associated apparatus
which contribute to this type of protection.
For example, the requirements for encapsulation with casting compound apply only if
encapsulating is required to satisfy 6.3.5 or 6.6.
6.1 Enclosures
6.1.1 General
Where intrinsic safety can be impaired by ingress of moisture or dust or by access to
conducting parts, for example if the circuits contain infallible creepage distances, an
enclosure is necessary.
7 Components on which Intrinsic Safety Depends
7.1 Rating of components
For Level of Protection “ia” and “ib” in both normal operation and after application of
the fault conditions given in Clause 5, any remaining components on which the type of
protection depends, shall not operate at more than two-thirds of their maximum current,
voltage and power related to the rating of the device, the mounting conditions and the
temperature range specified. For Level of Protection “ic”, in normal operation,
components on which the type of protection depends shall not operate at more than
their maximum current and voltage and no more than two-thirds of their power. These
maximum rated values shall be the normal commercial ratings specified by the
manufacturer of the component.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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