GB/T 3836.9-2021 PDF English
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| GB/T 3836.9-2021 | English | 530 |
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Explosive atmospheres - Part 9: Equipment protection by encapsulation 'm'
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| GB 3836.9-2014 | English | 300 |
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Electrical apparatus for explosive gas atmospheres -- Part 9: Encapsulation m
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| GB 3836.9-2006 | English | 879 |
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Electrical apparatus for explosive gas atmospheres -- Part 9: Encapsulation m
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| GB 3836.9-1990 | English | 399 |
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Electrical apparatus for explosive atomspheres--Encapsulated electrical apparatus m
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GB/T 3836.9-2021: Explosive atmospheres - Part 9: Equipment protection by encapsulation 'm'---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/GBT3836.9-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.9-2014, GB 12476.6-2010
Explosive Atmospheres - Part 9.Equipment Protection
by Encapsulation “m”
(IEC 60079-18.2014, Explosive Atmospheres - Part 18.Equipment
Protection by Encapsulation “m”, MOD)
Issued on. OCTOBER 11, 2021
Implemented on. MAY 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
Introduction... 9
1 Scope... 12
2 Normative References... 12
3 Terms and Definitions... 14
4 General... 15
5 Requirements for Compounds... 15
6 Temperatures... 17
7 Constructional Requirements... 18
8 Type Tests... 35
9 Routine Verifications and Tests... 41
10 Marking... 42
Appendix A (informative) Basic Requirements for Compounds for “m”
Equipment... 43
Appendix B (informative) Allocation of Test Samples... 45
Appendix C (normative) Dielectric Strength Test between Circuits and
Environment... 46
Bibliography... 48
Foreword
This document was drafted in accordance with the rules in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing
Documents.
This document is Part 9 of GB/T 3836 Explosive Atmospheres. GB/T 3836 has
released the following parts.
---Part 1.Equipment - General Requirements;
---Part 2.Equipment Protection by Flameproof Enclosures “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 Vapor 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 serves as a replacement of GB 3836.9-2014 Explosive Atmospheres -
Part 9.Equipment Protection by Type of Protection “m” and GB 12476.6-2010
Electrical Apparatus for Use in the Presence of Combustible Dust - Part 6.Protection
by Encapsulation “mD”. This document focuses on GB 3836.9-2014 and integrates the
main content of GB 12476.6-2010.In comparison with GB 3836.9-2014, apart from
structural adjustments and editorial modifications, the main technical changes are as
follows.
---Additional requirements for protection level “mb” are added (see 4.2);
---The requirements for thermal conductivity are added to the specification (see
5.2);
---The option of determining reliable components and isolation compounds in a
fault is added (see 7.2);
---The dimensional drawing of compound thickness is modified (see 7.4.1; 7.4.1
of Version 2014);
---Standard options for multi-layer printed circuit boards with rigid through-
connections are added (see 7.4.3.1);
---Additional requirements for batteries are modified and added (see 7.8.3; 7.8.3
of Version 2014);
---The requirements for 2 protective devices with protection level “ma” are added
(see 7.9.2);
---The requirements for 2 thermal protective devices with protection level “mb” are
added (see 7.9.3);
---The restriction of two-thirds of the rated voltage of the resettable thermal
protective device with switching contacts is deleted (see 7.9.3 of Version 2014);
---The requirements for the determination of the maximum surface temperature of
protection level “Da” are added (see 8.2.2);
---The reference service temperature of the thermal endurance test is modified
(see 8.2.3.1; 8.2.3.1 of Version 2014);
---The option of type test of dielectric strength is added (see 8.2.4.1);
---An alternative method for the pressure test of equipment with protection level
“mb” is added (see 8.2.6);
---The requirement for the number of samples for sealing test with built-in
protective devices and the method of reducing samples are added (see 8.2.8);
---Different situations of routine dielectric strength test are added (see 9.2);
---The requirements for the dielectric strength test between the circuit and the
environment are added (see Appendix C).
This document adopts the re-drafting method in the modification and adoption of IEC
60079-18.2014 Explosive Atmospheres - Part 18.Equipment Protection by
Encapsulation “m”.
The technical differences between this document and IEC 60079-18.2014, and the
causes for the differences are as follows.
---In terms of Normative References, this document makes certain adjustments
with technical differences, so as to adapt to the technical conditions of China.
The adjustments are intensively reflected in Chapter 2 “Normative References”.
See the specific adjustments below.
GB/T 1408.1, which equivalently adopts international standard, is used to
replace IEC 60243-1 (see 5.2);
GB/T 3836.1, which modifies and adopts international standard, is used to
replace IEC 60079-0 (see Chapter 1);
GB/T 3836.3, which modifies and adopts international standard, is used to
replace IEC 60079-7 (see 7.2.2);
GB/T 3836.4, which modifies and adopts international standard, is used to
replace IEC 60079-11 (see 7.2.2);
GB/T 3836.8, which modifies and adopts international standard, is used to
replace IEC 60079-15 (see 7.5.2);
GB 3836.20, which modifies and adopts international standard, is used to
replace IEC 60079-26 (see 7.6.2);
GB/T 3836.31, which modifies and adopts international standard, is used
to replace IEC 60079-31 (see 7.6.2);
GB/T 7153, which equivalently adopts international standard, is used to
replace IEC 60738-1 (see 7.9.3);
GB/T 9816.1, which modifies and adopts international standard, is used to
replace IEC 60691 (see 7.8.5);
GB/T 14536.10, which equivalently adopts international standard, is used
to replace IEC 60730-2-9 (see 7.9.3);
GB/T 17045, which equivalently adopts international standard, is used to
replace IEC 61140 (see 7.2.3);
GB/T 19212.1, which modifies and adopts international standard, is used
to replace IEC 61558-1 (see 7.2.3);
GB/T 19212.7, which equivalently adopts international standard, is used to
replace IEC 61558-2-6 (see 7.2.3);
GB/T 9364 (all parts) is used to replace IEC 60127 (all parts) (see 7.8.5).
The degree of consistency between the various parts of the two standards
is as follows.
GB/T 9364.1-2015 Miniature Fuses - Part 1.Definitions for Miniature
Fuses and General Requirement for Miniature Fuse-links (IEC 60127-
1.2006, MOD);
GB/T 9364.2-2018 Miniature Fuses - Part 2.Cartridge Fuse-links (IEC
60127-2.2014, MOD);
GB/T 9364.3-2018 Miniature Fuses - Part 3.Sub-miniature Fuse-links
(IEC 60127-3.2015, MOD);
GB/T 9364.4-2016 Small Fuses - Part 4.Universal Module Fuse-links
(UMF) - Perforated and Surface Mount (IEC 60127-4.2012, MOD);
GB/T 9364.5-2011 Miniature Fuses - Part 5.Guidelines for Quality
Assessment of Miniature Fuse-links (IEC 60127-5.1988, IDT);
GB/T 9364.6-2001 Miniature Fuses - Part 6.Fuse-holders for
Miniature Cartridge Fuse-links (IEC 60127-6.1994, IDT);
GB/T 9364.7-2016 Small Fuses - Part 7.Small-sized Fuse-links for
Special Applications (IEC 60127-7.2013, MOD);
GB/T 9364.10-2013 Miniature Fuses - Part 10.User Guide for
Miniature Fuses (IEC 60127-10.2001, MOD).
---e) is deleted from Chapter 10 Marking, because this requirement is already
included in GB/T 3836.1-2021.
This document makes the following editorial modifications.
---In order to be consistent with the existing standard series, the title of this
document is modified into Explosive Atmospheres - Part 9.Equipment
Protection by Encapsulation "m";
---The FOOTNOTE and NOTE in Table 1 are incorporated;
---The Amendment of IEC 60079-18.2014/AMD1.2017 and the Corrigendum of
IEC 60079-18.2014/COR1.2018 are incorporated; the outer margin of the
involved clauses is marked with a vertical double line ();
---The Bibliography is modified.
Please be noted that certain content of this document may involve patents. The
institution issuing this document does not undertake the responsibility of identifying
these patents.
This document was proposed by China Electrical Equipment Industry Association.
This document shall be under the jurisdiction of National Technical Committee 9 on
Explosion Protected Electrical Apparatus of Standardization Administration of China
(SAC/TC 9).
The drafting organizations of this document. Nanyang Explosion-proof Electrical
Research Institute Co., Ltd.; CCTEG Shenyang Institute; Shanghai Inspection and
Testing Institute of Instruments and Automation Systems Co., Ltd.; CCTEG Chongqing
Engineering Co., Ltd.; Wolong Electric Nanyang Explosion Protection Group Co., Ltd.;
Sunleem Technology Incorporated Company; WAROM Technology Incorporated
Company; FEICE Explosion-proof Electric Co., Ltd.; CZ Explosion-proof Electric
Appliances Co., Ltd.; Nanyang Zhongtian Explosion-proof Electric Co., Ltd.
The main drafters of this document. Wang Jun, Li Yue, Zhang Gang, Ju Zhe, Bai
Zhaohao, Jin Zhaohui, Liu Yulei, Zheng Zhenxiao, Zhou Jing, Xu Yuedi, Jiang Weixin,
Sun Jingfu.
The issuing of the previous versions.
---Issued for the first time as GB 3836.9 in 1990; revised for the first time in 2006;
revised for the second time in 2014;
---Issued for the first time as GB 12476.6 in 2010.
1 Scope
This document gives the specific requirements for the construction, testing and
marking of electrical equipment, parts of electrical equipment and Ex components with
the type of protection encapsulation “m” intended for use in explosive gas atmospheres
or explosive dust atmospheres.
2 Normative References
The contents of the following documents constitute indispensable clauses of this
document through normative references in the text. In terms of references with a
specified date, only versions with a specified date are applicable to this document. In
terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 1408.1 Electrical Strength of Insulating Materials - Test Methods - Part 1.Tests
at Power Frequencies (GB/T 1408.1-2016, IEC 60243-1.2013, IDT)
GB/T 3836.1 Explosive Atmospheres - Part 1.Equipment - General Requirements
(GB/T 3836.1-2021, IEC 60079-0.2017, MOD)
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 3836.1 and
the following definitions apply.
moisture, gas and dust tight permanent bonding of a compound to a surface.
insulation material, which is extruded or molded, but not poured.
4 General
The working voltage at any point in the circuit shall not exceed 1 kV.
5 Requirements for Compounds
Either the compound shall be tested in accordance with 8.1.1 or, if this test is not
performed, the certificate number for the equipment shall include the “X” suffix in
accordance with the marking requirements of GB/T 3836.1 and the specific conditions
of use listed on the certificate shall detail the precautions necessary.
Where the dielectric strength according to GB/T 1408.1 at the maximum service
temperature according to 8.2.2 a), of the compound is not available from the material
manufacturer, a test shall be performed in accordance with 8.1.2.
6 Temperatures
Where the equipment may be subject to fault in accordance with 7.2.1, or where there
is the possibility of an increased temperature, for example by an unfavorable input
voltage in accordance with 7.2.1 or an unfavorable load, this shall be considered in
determining the limiting temperatures.
7 Constructional Requirements
For levels of protection “ma” and “mb” the following components shall be considered
as not to fail if they are encapsulated according to the requirements of this standard, if
they are suitable for the service temperature and if they are not operated at more than
2/3 of their rated voltage, rated current and rated power related to the rating of the
device, the mounting conditions and the temperature range specified.
8 Type Tests
After testing, the sample shall be subjected to a visual inspection. Visible displacement
of the cable, which affects the type of protection, shall not be evident. No damage to
the compound or cable that could impair the type of protection shall be evident, for
example, cracks in the compound, exposure of the encapsulated components or failure
of adhesion.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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