GB/T 29304-2012 English PDF (GBT29304-2012)
GB/T 29304-2012 English PDF (GBT29304-2012)
GB/T 29304-2012: Safety guide for explosion protection in explosive hazardous areas
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
Safety guide for explosion protection
in explosive hazardous areas
ISSUED ON. DECEMBER 31, 2012
IMPLEMENTED ON. JUNE 01, 2013
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
Introduction .. 4
1 Scope .. 5
2 Normative references ... 6
3 Terms and definitions ... 6
4 General principles ... 9
5 Requirements for safety and health protection of workers in hazardous areas ... 9
6 Provisions on hazardous area division and equipment & protective system type selection .. 12
7 General safety technical requirements for equipment and protective system ... 13
8 Criteria for determining equipment category and its protection level .. 16 9 Explosion proof safety basic requirements for equipment, protective system design and structure ... 19
10 Inspection and assessment .. 33
Appendix A (Normative) Main conformity basic standard ... 36
Appendix B (Normative) Principles for division of other explosive hazardous areas other than coal mine gas and/or inflammable coal dust atmosphere ... 41 Appendix C (Normative) Type selection principles for category II and III equipment and protective system ... 43
Appendix D (Informative) Grading concept of underground mine hazardous
atmosphere AND selection of equipment and protective system ... 44
Appendix E (Normative) Special requirements for improving the safety and health protection of staff in potentially explosive atmospheres .. 47
Appendix F (Normative) Warning signs for areas where explosive atmospheres may occur .. 50
This standard was drafted in accordance with the rules given GB/T 1.1-2009. This standard refers to GB 19517-2009 ?€?National safety technical code for electric equipment?€? for the compilation format, AND refers to the relevant contents of the European explosion-proof directives for the technical contents. Please note that some of this document may be patentable. The issuing
agencies of this document do not bear the responsibility of identifying these patents.
This standard was proposed by the China Electrical Equipment Industry
This standard shall be under the jurisdiction of the National Standardization Technical Committee on Explosion-proof Electrical Equipment (SAC/TC 9). The responsible drafting organizations of this standard. Nanyang Institute of Explosion-proof Electric, National Explosion-proof Electrical Products Quality Supervision and Inspection Center, Coal Research Institute Shanghai Branch, Shanghai Institute of Industrial Automation Instrumentation, Zhengzhou Coal Industry (Group) Co., Ltd., Beijing North Yongbang Technology Co., Ltd., Coal Research Institute Fushun Branch.
The participating drafting organizations of this standard. Henan Jiyuan Mine Electric Co., Ltd., Shenzhen Jinming Technology Co., Ltd., Xinliming Explosion- proof Electric Co., Ltd., Zhenjiang Dongfang Electric Co., Ltd.
The main drafters of this standard. Wang Jun, Zhang Gang, Xu Jianping, Liu Hengyun, Fu Shuling, Li Bin, Wang Yunsheng, Li Shuchao.
The participating drafters of this standard. Zhang Ruhong, Xin Changyu, Huang Shuanghu, Zheng Zhenxiao, Wu Xudong.
Safety guide for explosion protection
in explosive hazardous areas
1.1 This standard specifies the safety guide for explosion protection in explosive hazardous areas. It includes the requirements for the safety protection of the owner to the workers in various types of explosive hazardous areas, as well as the common explosion proof safety technical requirements in the design, manufacture, inspection, sale, installation, use, overhauling, and maintenance of the equipment and protection system.
1.2 This standard applies to the safety protection of the owner of the explosive hazardous area for the workers in the explosive hazardous area, as well as the equipment and protection system as used in the explosive hazardous area. It can be used as the minimum requirements of the owner of the explosive
hazardous area for the safety protection of the workers, as well as the structural foundations for the explosion proof safety contents of the equipment and protection system in various explosive hazardous areas AND the technical foundations for the design, manufacture, inspection, sale, installation and use of the equipment and protection system in the explosive hazardous area. 1.3 Those safety devices, control devices and adjusting devices intended to be used outside the explosive hazardous area BUT which are associated with the safety functions of equipment and protective systems in explosive hazardous area or which has safety functions are also included in the scope of this standard.
1.4 The owner of an explosion hazardous area within the territory of the People's Republic of China shall comply with the requirements of this standard; the equipment and protective systems for explosive hazardous areas designed, manufactured, sold and used within the territory of the People's Republic of China shall comply with the requirements of this standard. Export products can be implemented in accordance with the contract.
1.5 If other laws and regulations have safety requirements for other aspects of the equipment and protection system in explosive hazardous area AND the owner has other safety protection requirements for the workers in the explosive hazardous area, then the equipment and protection system in the explosive hazardous area as well as the safety protection of the owner for the explosive hazardous area worker shall also comply with the corresponding requirements. The equipment and protection systems for explosive hazardous area and the special requirements of the owner for safety protection for workers in explosive hazardous areas shall be detailed in the corresponding specific standard, AND be specified through corresponding demonstration, verification, and technical data supplementation.
1.6 This standard is tentatively not applicable to the following equipment and protection systems, as well as the safety protection of workers in this environment. the explosion hazard of equipment and protection system is entirely caused by explosive materials or unstable chemicals; medical
equipment for medical environment; equipment, protection systems and
components in places where an explosion is caused by the reaction of a
substance with other oxidants in the atmosphere than oxygen, or where an explosion is caused by other hazardous reactions or non-atmospheric
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 2900.35 Electrotechnical terminology - Equipment for explosive
atmospheres (GB/T 2900.35-2008, IEC 60050-426.2008, IDT)
GB 3836.1 Electrical apparatus for explosive atmosphere - General
requirements (GB 3836.1-2010, IEC 60079-0.2007, MOD)
Coal mine safety regulations (Decree No.37 of the State Administration of Work Safety issued on January 25, 2011, ?€?Decision on amending some
clauses of Part 2, Chapter 6 water control of the Coal Mine Safety
Regulations?€?, implemented from March 1, 2011)
3 Terms and definitions
The terms and definitions as defined in GB/T 2900.35 and GB 3836.1 as well as the following terms and definitions apply to this document.
Equipment for explosive atmospheres is classified as category I, category II and category III in accordance with the applicable explosive atmosphere. Category I equipment. Equipment for coal mine gas and/or combustible coal environment;
Category II equipment. Equipment used in other explosive gas atmospheres than coal mine gas;
Category III equipment. Equipment used in combustible dust atmospheres
other than coal mines.
Note 1. Category II and III equipment can be further subdivided in
accordance with the type or characteristics of the explosive atmospheres they are intended to use.
Note 2. Equipment and protective systems can be designed for use in a
particular explosive atmosphere. In this case, it shall be marked accordingly. 3.6.2 Equipment protection level; EPL
The level of protection provided for the equipment in accordance with the possibility of the equipment becoming a source of ignition and the different characteristics possessed by the explosive atmosphere, the explosive dust environment and the explosive atmosphere of the coal mine methane.
Note. The determination of the equipment protection level (EPL) as required is as shown in Chapter 8.
Depending on the category and grade of equipment, all equipment, the
protective system and the equipment specified in 1.3 required for the safe operation of the equipment, protective system, and component provided by the manufacturer.
Any instrument, equipment, tool, or device used in the work.
Use of working equipment
7.1.5 The equipment is able to withstand the expected dangerous physical and chemical effects such as static or dynamic loads, liquids or gases, heat or unusual weather, without causing any danger.
7.1.6 When manufacturing equipment, it is only allowed to use the materials which can withstand the physical and chemical impacts such as aging,
corrosion, and radiation occurred in the course of intended use.
7.1.7 The design of the equipment used in explosive hazardous areas shall be ergonomically constructed to reduce labor intensity and ease of use, and to be able to prevent hazards.
7.2 Electrical hazard protection
7.2.1 It may use the insulation protection technology, direct contact protection technology, indirect contact protection technology, etc., to provide adequate protection against the danger caused by the direct effect of electrical energy when the electrical equipment is for intended use. In order to ensure normal operation and to prevent the danger caused by the direct effect of current, the electrical equipment shall have enough insulation resistance, dielectric strength, heat resistance, moisture resistance, antifouling, flame retardancy, tracking resistance and other electrical insulation performance.
7.2.2 When basic insulation is damaged and there is a risk of fault contact voltage, additional insulation or reinforced insulation shall be evaluated separately.
7.2.3 Electrical equipment shall ensure that when the basic insulation fails or an arc occurs, the fault contact voltage does not cause harm.
Electrical equipment shall have ground protection (if necessary, equipotential bonding), or double insulation structure, or strengthen insulation, and other protective measures, unless otherwise there is special safety requirement. All parts that may be hazardous due to operating voltage, fault current, leakage current or the like shall comply with the relevant standards and provide adequate clearances and creepage distances.
7.2.4 It shall take appropriate measures to prevent the danger caused by the electrical or non-electrical indirect effects of high temperature, arc, radiation, gas, noise, vibration and so ...