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GB/T 3836.9-2021 English PDF (GBT3836.9-2021)

GB/T 3836.9-2021 English PDF (GBT3836.9-2021)

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GB/T 3836.9-2021: Explosive atmospheres -- Part 9: Equipment protection by encapsulation 'm'

GB/T 3836.9-2021
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. Explosive Atmospheres - Part 9: Equipment Protection
by Encapsulation “m”
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.
This document applies only for encapsulated electrical equipment, encapsulated parts of electrical equipment and encapsulated Ex components (hereinafter always referred to as “m” equipment) where the rated voltage does not exceed 11 kV.
The application of electrical equipment in atmospheres, which may contain explosive gas as well as combustible dust simultaneously, may require additional protective measures.
This document does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances.
This document does not take account of any risk due to an emission of flammable or toxic gas from the dust.
This document supplements and modifies the general requirements of GB/T 3836.1. Where a requirement of this standard conflicts with a requirement of GB/T 3836.1, the requirement of this document takes precedence.
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)
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 3836.4 Explosive Atmospheres - Part 4: Equipment Protection by Intrinsic Safety “i” (GB/T 3836.4-2021, IEC 60079-11:2011, MOD)
GB/T 3836.8 Explosive Atmospheres - Part 8: Equipment Protection by Type of Protection “n” (GB/T 3836.8-2021, IEC 60079-15:2017, MOD)
GB 3836.20 Explosive Atmospheres - Part 20: Equipment with Equipment Protection Level (EPL) Ga (GB 3836.20-2010, IEC 60079-26:2006, MOD)
GB/T 3836.31 Explosive Atmospheres - Part 31: Equipment Dust Ignition Protection by Enclosure “t” (GB/T 3836.31-2021, IEC 60079-31:2013, MOD)
GB/T 7153 Directly Heated Positive Step-function Temperature Coefficient Thermistors - Part 1: Generic Specification (GB/T 7153-2002, IEC 60738-1:1998, IDT) GB/T 9364 Miniature Fuses (all parts) [IEC 60127 (all parts)]
GB/T 9816.1 Thermal-links - Part 1: Requirements and Application Guide (GB/T 9816.1-2013, IEC 60691:2002, MOD)
GB/T 14536.10 Automatic Electrical Controls for Household and Similar Use - Particular Requirements for Temperature Sensing Controls (GB/T 14536.10-2008, IEC 60730-2-9-2004, IDT)
GB/T 17045 Protection against Electric Shock - Common Aspects for Installations and Equipment (GB/T 17045-2020, IEC 61140:2016, IDT)
GB/T 19212.1 Safety of Power Transformers, Power Supplies, Reactors and Similar Products - Part 1: General Requirements and Tests (GB/T 19212.1-2016, IEC 61558- 1:2009, MOD)
GB/T 19212.7 Safety of Transformers, Reactors, Power Supply Units and Similar Products for Supply Voltages up to 1,100 V - Part 7: Particular Requirements and Test for Safety Isolating Transformers and Power Supply Units Incorporating Safety Isolating Transformers (GB/T 19212.7-2012, IEC 61558-2-6:2009, IDT)
IEC 62326-4-1 Printed Boards - Part 4: Rigid Multilayer Printed Boards with Interlayer Connections - Sectional Specification - Section 1: Capability Detail Specification - Performance Levels A, B and C
ANSI/UL 248 (all parts) Standard for Low-voltage Fuses
ANSI/UL 746B Standard for Polymetric Materials - Long Term Property Evaluations ANSI/UL 796 Printed-wiring Boards

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