GB/T 3836.3-2021 PDF English
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Explosive atmospheres - Part 3: Equipment protection by increased safety 'e'
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| GB 3836.3-2010 | English | 640 |
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[Replaced by GB/T 3836.3-2021] Explosive atmospheres -- Part 3: Equipment protection by increased safety “e”
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| GB 3836.3-2000 | English | RFQ |
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Electrical apparatus for explosive gas atmospheres-Part 3: Increased safety e
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| GB 3836.3-1983 | English | RFQ |
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Electrical apparatus for explosive atmosphere--Increased safety electrical apparatuse
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GB/T 3836.3-2021: Explosive atmospheres - Part 3: Equipment protection by increased safety 'e'---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/GBT3836.3-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.3-2010
Explosive atmospheres - Part 3.Equipment protection by
increased safety "e"
(IEC 60079-7.2015, Explosive atmospheres - Part 7.Equipment protection by
increased safety "e", MOD)
Issued on. OCTOBER 11, 2021
Implemented on. MAY 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
Introduction... 12
1 Scope... 15
2 Normative references... 16
3 Terms and definitions... 20
4 Constructional requirements... 24
4.1 Level of Protection... 24
4.2 Electrical connections... 24
4.3 Clearances... 31
4.4 Creepage distances... 32
4.5 Printed wiring boards with conformal coating, Level of Protection “ec”... 40
4.6 Solid electrical insulating materials... 40
4.7 Windings... 42
4.8 Temperature limitations... 43
4.9 Wiring internal to equipment... 45
4.10 Degrees of protection provided by enclosures... 45
4.11 Fasteners... 47
5 Supplementary requirements for specific electrical equipment... 47
5.1 General... 47
5.2 Electrical machines... 48
5.3 Luminaires, hand lights, or cap lights... 60
5.4 Analog measuring instruments and instrument transformers... 72
5.5 Transformers other than instrument transformers... 73
5.6 Supplementary requirements for equipment incorporating cells and batteries... 73
5.7 General purpose connection and junction boxes... 84
5.8 Resistance heating equipment (other than trace heating systems)... 84
5.9 Supplementary requirements for fuses... 89
5.10 Other electrical equipment... 90
6 Type verifications and type tests... 90
6.1 Dielectric strength... 90
6.2 Rotating electrical machines... 91
6.3 Luminaires... 94
6.4 Measuring instruments and instrument transformers... 101
6.5 Transformers other than instrument transformers... 102
6.6 Verification and tests for cells and batteries of Level of Protection “eb”... 102
6.7 Verification and tests for cells and batteries of Level of Protection “ec”... 105
6.8 General purpose connection and junction boxes... 105
6.9 Resistance heating equipment... 106
6.10 Terminal insulating material tests... 108
7 Routine verifications and routine tests... 109
7.1 Dielectric tests... 109
7.2 Dielectric tests for batteries... 109
7.3 Inter-turn overvoltage tests... 109
8 Ex Component certificates... 110
8.1 General... 110
8.2 Terminals... 110
9 Marking and instructions... 110
9.1 General marking... 110
9.2 Ex Component enclosures... 112
9.3 Instructions for use... 112
9.4 Warning markings... 114
10 Documentation... 114
Annex A (normative) Temperature determination of electrical machines - Methods of
test and of calculation... 116
Annex B (normative) Type tests for specific forms of resistance heating devices or
resistance heating units (other than trace heater)... 121
Annex C (informative) Cage motors - Thermal protection in service... 123
Annex D (informative) Resistance heating devices and units - Additional electrical
protection... 124
Annex E (informative) Combinations of terminals and conductors for general purpose
connection and junction boxes... 125
Annex F (normative) Dimensions of copper conductors... 128
Annex G (normative) Test procedure for T5 (only 8 W), T8, T10 and T12 lamps... 129
Annex H (normative) Alternative separation distances for Level of Protection “ec”
equipment under controlled environments... 135
Annex I (informative) Application, installation, and testing considerations for Level of
Protection “ec” asynchronous machines... 138
Annex J (informative) Luminaires incorporating LEDs... 140
Bibliography... 141
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document is Part 3 of GB/T 3836 "Explosive atmospheres". The following parts
of GB/T 3836 have been issued.
- 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 Level of Protection (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 replaces GB 3836.3-2010 Explosive atmospheres - Part 3.Equipment
protection by increased safety "e". Compared with GB 3836.3-2010, in addition to the
structural and editorial changes, the main technical changes in this document are as
follows.
- Added the requirements for the classification of increased safety "e" electrical
equipment and Ex components according to Level of Protection "eb" and Level of
Protection "ec" (from "nA" in GB 3836.8-2014) (see Chapter 1 of this Edition);
- Added the requirements for different Level of Protections of "eb" and "ec" for
electrical connections (see 4.2 of this Edition);
- Added the requirements for Level of Protection "ec" printed circuit boards (see 4.5
of this Edition);
- Changed the requirements for solid electrical insulating materials (see 4.6 of this
Edition, 4.5 of Edition 2010);
- Changed the general content of limit temperature and added the determination
condition for maximum surface temperature (see 4.8.1 of this Edition. 4.7.1 of
Edition 2010);
- Changed the requirements for enclosure Level of Protection (see 4.10 of this
Edition, 4.9 of Edition 2010);
- Added different requirements for motors according to Level of Protection "eb" and
Level of Protection "ec" (see 5.2.1, 5.2.3, 5.2.4, 5.2.8.3, 5.2.8.4, 5.2.9, 5.2.10, Table
6, 5.2.13 of this Edition);
- Deleted the limit temperature requirements for the motor stator winding terminals
in the starting state (see 5.2.6 of Edition 2010);
- Added the requirements for light-emitting diodes (LEDs) according to Level of
Protection "ec" (see 5.3.2.5, 5.3.4.3 of this Edition);
- Added the requirements for the electrical spacing of lamps according to Level of
Protection "eb" and Level of Protection "ec" (see 5.3.4 of this Edition);
- Added the requirements for the lamp holder of the double foot lamp according to
for Level of Protection "eb" and Level of Protection "ec" (see 5.3.5.3 of this
Edition);
- Added the requirements for bayonet sockets for lamps (see 5.3.5.4.2 of this Edition);
- Added the requirements for the internal auxiliary equipment of lamps according to
Level of Protection "ec" (see 5.3.6 of this Edition);
- Added the requirements for tubular double-pin fluorescent lamps according to
Level of Protection "eb" and Level of Protection "ec" (see 5.3.9 of this Edition);
- Added the requirements for equipment containing single cells or battery packs
according to Level of Protection "eb" and Level of Protection "ec" (see 5.6 of this
Edition);
- Added the documentation requirements (see Chapter 10 of this Edition);
- Added the selection of separation distances for equipment of Level of Protection
"ec" in a controlled environment (see Annex H of this Edition).
The following editorial changes have been made to this document.
- To be consistent with the existing standard series, the name of this document is
changed to Explosive atmospheres - Part 3.Equipment protection by increased
safety "e";
- Deleted the note on battery type in 3.1.1~3.1.2;
- Revised the note on 3.21 Safety devices;
- Merged the notes to Table 2 into footnote a;
- In 5.2.1 added the note about Annex I;
- In 5.2.12.1, added the title "General";
- In 5.8.1, added the note about Annex D;
- Incorporated the amendments from IEC 60079-7.2015/AMD1.2017.The outer
margins of the articles in question are marked with vertical double lines (II);
- Modified the Bibliography.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China Electrical Equipment Industry Association.
This document shall be under the jurisdiction of National Technical Committee on
Explosion-proof Electrical Equipment of Standardization Administration of China
(SAC/TC 9).
The drafting organizations of this document. Nanyang Explosion-proof Electric
Research Institute Co., Ltd., Jiamusi Explosion-proof Electric Motor Research Institute
Co., Ltd., Shanghai Institute of Quality Supervision and Inspection Technology,
Shanghai Instrumentation Automatic Control System Inspection and Testing Institute
Co., Ltd., Wolong Electric Nanyang Explosion-proof Group Co., Ltd., Shenyang
Research of Coal Science Group Institute Co., Ltd., Helong Explosion-proof Electric
Co., Ltd., Huarong Technology Co., Ltd., Chuangzheng Electric Co., Ltd., New Dawn
Technology Co., Ltd., Feice Explosion-proof Electric Co., Ltd., Liaoyuan Holding
Group Co., Ltd.
Main drafters of this document. Wang Jun, Yang Li, Zhang Gang, Wang Weiyue, Gong
Fanchang, Ge Qing, Wang Jianqiao, Li Bing, Gu Baohu, Zhang Naiyue, Li Jiang, Zhang
Wei, Zheng Zhenxiao, Zhao Tuo, Xu Yuedi, Li Linsong.
Versions of standard substituted by this document are.
- GB 3836.3-1983 that was issued in 1983 for the first time. The first revision was
in 2000.The second revision was in 2010;
- This is the third revision.
1 Scope
This document specifies the requirements for the design, construction, testing and
marking of electrical equipment and Ex Components with type of protection increased
safety “e” intended for use in explosive gas atmospheres.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 755, Rotating electrical machines - Rating and performance (GB/T 755-2019,
IEC 60034-1.2017, IDT)
GB/T 1040.2, Plastics - Determination of tensile properties - Part 2.Test conditions
for moulding and extrusion plastics (GB/T 1040.2-2006, ISO 527-2.1993, IDT)
GB/T 1312, Lamp holders for tubular fluorescent lamps and starter holders (GB/T
1312-2007, IEC 60400.2004, IDT)
GB/T 1406.1, Types and dimensions of lamp caps - Part 1.Screw caps (GB/T
1406.1-2008, IEC 60061-1.2005, MOD)
GB/T 1406.2, Types and dimensions of lamp caps - Part 2.Pin lamp caps (GB/T
1406.2-2008, IEC 60061-1.2005, MOD)
GB/T 1406.5, Types and dimensions of lamp caps - Part 5.Bayonet caps
(GB/T1406.5-2008, IEC 60061-1.2005, MOD)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 3836.1 as
well as the followings apply.
3.1 cell and battery types
3.1.1 sealed cell
cell which remains closed and does not release either gas or liquid when operated within
the limits specified by the manufacturer
NOTE. Such batteries are usually equipped with safety devices to prevent dangerously high internal
pressures. And they are designed to operate in pristine sealed condition for the life of the product.
3.1.2 valve-regulated cell or battery
secondary cell or battery which is closed under normal conditions, but which has an
arrangement which allows the escape of gas if the internal pressure exceeds a
predetermined value
4 Constructional requirements
Electrical connections intended to be terminated internal to the equipment enclosures
are subdivided into those for field-wiring, 4.2.2, and for factory wiring, 4.2.3, and into
permanent types and reconnectable/rewireable types for convenience in detailing the
appropriate requirements.
5 Supplementary requirements for specific electrical equipment
These requirements supplement those of Clause 4 of this document which are applicable
also, unless otherwise stated, to the specific electrical equipment considered in 5.2 to
5.9 and also to the other electrical equipment considered in 5.10.
The requirements in this clause apply to rotating electrical machines within the scope of GB/T 755.
The supplemental requirements given in 5.3 apply to all luminaires (fixed, portable, or
transportable), hand lights, and cap lights (other than for Group I); intended to be
supplied by mains (with or without galvanic isolation) or powered by batteries.
6 Type verifications and type tests
Where machines with cage rotors are to be subjected to tests with their rotors locked in
order to determine the starting current ratio IA/ IN and the time tE, the methods of test or
of calculation shall be in accordance with Annex A.
7 Routine verifications and routine tests
A dielectric strength test shall be carried out in accordance with 6.1.Alternatively, a test
shall be carried out at 1.2 times the test voltage, but maintained for at least 100 ms.
For Level of Protection “ec”, where there is a routine dielectric strength test in the
relevant industrial standard for the individual items of electrical equipment, this test is
acceptable.
8 Ex Component certificates
As the application of increased safety “e” Ex Components can often affect temperature
rise and creepage/clearance, Ex Component certificates shall include the necessary
technical information to allow the appropriate evaluation of the application of the Ex
Component in equipment.
9 Marking and instructions
These requirements supplement and modify the marking and instruction requirements
of GB/T 3836.1 which are applicable also to Type of Protection increased safety “e”.
The Level of Protection “eb” or “ec”, shall be shown as the Level of Protection.
Electrical equipment shall be additionally marked with the following.
10 Documentation
Documentation in accordance with GB/T 3836.1 shall be prepared, including any
additional items specified in this document.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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