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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...
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