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GB/T 3836.1-2021 English PDF (GBT3836.1-2021)

GB/T 3836.1-2021 English PDF (GBT3836.1-2021)

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GB/T 3836.1-2021: Explosive atmospheres -- Part 1: Equipment -- General requirements

GB/T 3836.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.1-2010, GB 12476.1-2013
Explosive Atmospheres – Part 1: Equipment – General
Requirements
(IEC 60079-0:2017, Explosive Atmospheres
– Part 0: Equipment – General Requirements, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
Introduction ... 13
1 Scope ... 16
2 Normative References ... 19
3 Terms and Definitions ... 22
4 Equipment Grouping ... 40
5 Temperatures ... 41
6 Requirements for All Equipment ... 47
7 Non-Metallic Enclosures and Non-Metallic Parts of Enclosures ... 51
8 Metallic Enclosures and Metallic Parts of Enclosures ... 61
9 Fasteners ... 63
10 Interlocking Devices ... 66
11 Bushings ... 66
12 (Reserved for Future Use) ... 66
13 Ex Components ... 66
14 Connection Facilities ... 67
15 Connection Facilities for Earthing or Bonding Conductors ... 68
16 Entries into Enclosures ... 70
17 Supplementary Requirements for Electric Machines ... 73
18 Supplementary Requirements for Switchgear ... 77
19 Supplementary Requirements for Fuse ... 79
20 Supplementary Requirements for External Plugs, Socket Outlets and
Connectors for Field Wiring Connection ... 79
21 Supplementary Requirements for Luminaires ... 80
22 Supplementary Requirements for Caplights and Handlights ... 82
23 Equipment Incorporating Cells and Batteries ... 82
24 Documentation ... 86
25 Compliance of Prototype or Sample with Documents ... 86
26 Type Tests ... 86
27 Routine Tests ... 110
28 Manufacturer's Responsibility ... 110
29 Marking ... 111
30 Instructions... 126
Annex A (Normative) Supplementary Requirements for Cable Glands ... 131 Annex B (Normative) Requirements for Ex Components ... 144
Annex C (Informative) Example of Rig for Resistance to Impact Test ... 147 Annex D (Informative) Electric Machines Connected to Converters ... 148 Annex E (Informative) Temperature Evaluation of Electric Machines ... 150 Annex F (informative) Guidance Flowchart for Tests of Non-Metallic Enclosures or Non-Metallic Parts of Enclosures (26.4) ... 155
Annex G (Informative) Guidance Flowchart for Tests of Cable Glands ... 156 Annex H (Informative) Shaft Voltages Resulting in Motor Bearing or Shaft Brush Sparking Discharge Energy Calculation ... 158
Annex I (Normative) Special Requirements for Group I Electrical Equipment ... 165
Annex J (Normative) Verification Procedure of Obtaining Certificate ... 166 Bibliography ... 168
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This Document is Part 1 of GB/T 3836 Explosive Atmospheres. GB/T 3836 has published the following parts:
--- 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 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 replaced GB 3836.1-2010 Explosive Atmospheres - Part 1: Equipment - General Requirement and GB 12476.1-2013 Electrical Apparatus for Use in the Presence of Combustible Dust - Part 1: General Requirements. Mainly based on GB 3836.1-2010, this Document integrates the major contents of GB 12476.1-2013; the major technical changes of this Document, except the structural adjustments and editorial modifications, are as follows:
--- Integrate the requirements of equipment for combustible dust environment; --- Change the maximum surface temperature requirements of Group III electrical equipment (see 5.3.2.3 of this Edition; 5.3.2.3 of 2010 Edition);
--- Increase the requirements for liner retention and the use of cement (see 6.5 of this Edition);
--- Change the requirements of the ultrasonic source (see 6.6.3 of this Edition; 6.6.3 of 2010 Edition);
--- Change the requirements for lasers, lamps or other non-divergent continuous wave light sources (see 6.6.4 of this Edition; 6.6.2 of 2010 Edition);
--- Increase the replacement requirements of O-shaped elastic sealing ring (see 7.2.3 of this Edition);
--- Change the electrostatic charge requirements on external non-metallic materials (see 7.4 of this Edition; 7.4 of 2010 Edition);
---Add the requirements for ancillary external metal parts (see 7.5 of this Edition); --- Increase the requirements for the use of copper alloys for the enclosure (see 8.5 of this Edition);
---Add the requirements of Ex component explosion-proof certificate (see 13.5 of this Edition);
---Add the requirements for cable entry devices, blanking elements, and threaded pipe joints (see 16.3~16.5 of this Edition);
--- Change the supplementary requirements for rotating electrical machines (see Clause 17 of this Edition; Clause 17 of 2010 Edition);
--- Change the supplementary requirements for plugs, sockets and connectors (see Clause 20 of this Edition; Clause 20 of 2010 Edition);
--- Increase the types of single cells that can be used (see 23.3 of this Edition); --- Change the temperature measurement test (see 26.5.1 of this Edition; 26.5.1 of 2010 Edition);
--- Change the heat resistance test (see 26.8 of this Edition; 26.8 of 2010 Edition); --- Change the ultraviolet (UV) resistance test (see 26.10 of this Edition; 26.10 of 2010 Edition);
--- Delete the electrification test (see 26.14 of 2010 Edition);
--- Change the capacitance measurement test (see 26.14 of this Edition; 26.15 of 2010 Edition);
--- Increase fan rating verification (see 26.15 of this Edition);
---Add replacement assessment of the O-shaped elastic sealing ring (see 26.16 of this Edition);
--- Increase the transfer charge test (see 26.17 of this Edition);
--- Add the marking requirements for Ex-related equipment (see 29.4~29.5 of this Edition);
--- Change the maximum surface temperature marking requirements for Group III Ex equipment (see 29.5 of this Edition; 29.4 of 2010 Edition);
--- Increase the marking requirements for equipment installed in the boundary wall (see 29.9 of this Edition);
--- Delete another marking of equipment protection level (see 29.12 of 2010 Edition); ---Add the additional marking requirements for motors controlled by converters (see 29.15 of this Edition);
--- Change the marking example (see 29.16 of this Edition; 29.14 of 2010 Edition); ---Add the information included in the instruction manual (see 30.1 of this Edition); ---Add additional requirements for the motor manual (see 30.3 of this Edition); ---Add the Additional requirements for ventilation fan manuals (see 30.4 of this Edition);
--- Increase the marking requirements for cable entry devices (see 30.5 and A.5 of this Edition);
--- Change the applicability of the clauses to Ex components (see Annex B of this Edition; Annex B of 2010 Edition).
This Document uses the redrafting method to modify and adopt IEC 60079-0:2017 Explosive Atmospheres – Part 0: Equipment – General Requirements.
This Document made the following structural adjustments:
--- Delete the following terms in the original IEC standard, such as 3.13.11 "casting", 3.14 "conformal coating", 3.18 "factory connector", 3.19 "field wiring connector", 3.21.1 "soft start converter", 3.25 "dust-tight enclosure", 3.42 "counting failure", 3.43 "non-counting failure", 3.45 "clear space", 3.47 "electrical isolation", 3.51 "reliable isolation", 3.55 "lower limit of combustion ", 3.61 "mist", 3.68 "spontaneous combustible substances", 3.71 "rated insulation voltage", 3.73 "reproduction peak voltage", 3.74 "related drawings", 3.77 "isolation parts", 3.78 "usable state", 3.81.3 "distance through pouring compound", 3.81.4 "distance through solid insulation", 3.81.5 “distance under coating”, 3.90 “upper limit of Explosive Atmospheres – Part 1: Equipment – General
Requirements
1 Scope
This Document specifies the general requirements for construction, testing and marking of Ex Equipment and Ex Components intended for use in explosive atmospheres.
This Document applies to equipment intended to be used in an explosive gas atmospheres or an explosive dust atmospheres, including the equipment specified by the supplementary documents listed in this Document, as a general requirement when these equipment are used in an explosive atmospheres.
The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that Ex Equipment can be operated are: --- temperature -20 °C to +60 °C;
--- pressure 80 kPa to 110 kPa; and
--- air with normal oxygen content, typically 21 % v/v.
This Document and other standards supplementing this Document specify additional test requirements for Ex Equipment operating outside the standard temperature range, but further additional consideration and additional testing may be required for Ex Equipment operating outside the standard atmospheric pressure range and standard oxygen content. Such additional testing may be particularly relevant with respect to Types of Protection that depend on quenching of a flame such as ‘flameproof enclosures “d”’ (GB/T 3836.2) or limitation of energy, ‘intrinsic safety “i”’ (GB/T 3836.4). NOTE 1: Although the standard atmospheric conditions above give a temperature range for the atmosphere of -20 °C to +60 °C, the normal ambient temperature range for the Ex Equipment is -20 °C to +40 °C, unless otherwise specified and marked. See 5.1.1. It is considered that - 20 °C to +40 °C is appropriate for many items of Ex Equipment and that to manufacture all Ex Equipment to be suitable for a standard atmosphere upper ambient temperature of +60 °C would place unnecessary design constraints.
NOTE 2: Requirements given in this standard result from an ignition hazard assessment made on equipment. The ignition sources taken into account are those found associated with this type of equipment, such as hot surfaces, electromagnetic radiation, mechanically generated sparks, mechanical impacts resulting in thermite reactions, electrical arcing and static electric discharge in normal industrial environments.
NOTE 3: Where an explosive gas atmosphere and a combustible dust atmosphere are, or can be, present at the same time, the simultaneous presence of both often warrants additional protective measures. Additional guidance on the use of Ex Equipment in hybrid mixtures (mixture of a flammable gas or vapor with a combustible dust or combustible flyings) is given in GB/T 3836.15.
GB/T 3836 does not specify requirements for safety, other than those directly related to the explosion risk.
Ignition sources like adiabatic compression, shock waves, exothermic chemical reaction, self-ignition of dust, naked flames and hot gases/liquids, are not addressed by this standard.
NOTE 4: Although outside the scope of this standard, such equipment would typically be subjected to a hazard analysis that identifies and lists all of the potential sources of ignition by the equipment and the measures to be applied to prevent them becoming effective. See GB/T 3836.28.
This document is supplemented or modified by the following parts and technical specifications:
– GB/T 3836.2: Explosive Atmospheres – Part 2: Equipment Protection by
Flameproof Enclosure “d”;
– GB/T 3836.3: Explosive Atmospheres – Part 3: Equipment Protection by
Increased Safety “e”;
– GB/T 3836.4: Explosive Atmospheres – Part 4: Equipment Protection by Intrinsic Safety “i”;
– GB/T 3836.5: Explosive Atmospheres – Part 5: Equipment Protection by
pressurized Enclosure “p”;
– GB/T 3836.6: Explosive Atmospheres – Part 6: Equipment Protection by Liquid Immersion “o”;
– GB/T 3836.7: Explosive Atmospheres – Part 7: Equipment Protection by Powder Filling “q”;
– GB/T 3836.8: Explosive Atmospheres – Part 8: Equipment Protection by Type of Protection “n”;
– GB/T 3836.9: Explosive Atmospheres – Part 9: Equipment Protection by
Encapsulation “m”;

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