GB/T 3836.3-2021Explosive atmospheres - Part 3: Equipment protection by increased safety 'e' (English PDF)

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.

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

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.

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