GB 12476.1-2013 PDF EnglishUS$430.00 · In stock · Download in 9 seconds
GB 12476.1-2013: Electrical apparatus for use in the presence of combustible dust -- Part 1: General requirements Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Obsolete GB 12476.1: Historical versions
Similar standardsGB 12476.1-2013: Electrical apparatus for use in the presence of combustible dust -- Part 1: General requirements---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/GB12476.1-2013 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.260.20 K 35 Replacing GB 12476.1-2000 Electrical Apparatus for Use in the Presence of Combustible Dust – Part 1.General Requirements (IEC 61241-0.2004.MOD) Issued on. DECEMBER 17, 2013 Implemented on. NOVEMBER 14, 2014 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword... 4 Introduction... 6 1 Scope... 8 2 Normative References... 9 3 Terms and Definitions... 11 4 Construction... 16 5 Temperatures... 18 6 Enclosure Materials... 19 7 Fasteners... 21 8 Interlocking Devices... 21 9 Bushings... 21 10 Materials Used for Cementing... 22 11 Ex Components... 22 12 Connection Facilities and Terminal Compartments... 23 13 Connection Facilities for Earthing or Bonding Conductors... 24 14 Cable and Conduit Entries... 25 15 Radiating Equipment... 27 16 Supplementary Requirements for Specific Electrical Apparatus – Rotating Electrical Machines... 28 17 Switchgear... 29 18 Fuses... 30 19 Plugs and Sockets... 30 20 Luminaires... 33 21 Caplights, Caplamps and Handlamps... 34 22 Apparatus Incorporating Cells and Batteries... 34 23 Type Verification and Tests... 36 24 Routine Verifications and Tests... 44 25 Manufacturer’s Responsibility... 45 26 Verifications and Tests on Modified or Repaired Electrical Apparatus... 45 27 Clamping Tests of Cable Entries for Non-Armored and Braided Cables... 45 28 Clamping Tests of Cable Entries for Armored Cables... 48 29 Marking... 49 30 Examples of Marking... 51 Appendix A (Normative) Inspection Procedures for Obtaining the Explosion- Proof Certificate... 54ForewordAll the technical contents in this Part are mandatory. GB 12476 consists of the following parts under the general title Electrical Apparatus for Use in the Presence of Combustible Dust. --- Part 1.General Requirements; --- Part 2.Selection and Installation; --- Part 3.Classification of Areas where Combustible Dusts are or May be Present; --- Part 4.Protection by Intrinsic Safety “iD”; --- Part 5.Protection by Enclosures “tD”; --- Part 6.Protection by Encapsulation “mD”; --- Part 7.Type of Protection “pD”; --- Part 8.Test Methods – Methods for Determining the Minimum Ignition Temperature of Dust; --- Part 9.Test Methods – Methods for Determining the Electrical Resistivity of Dust in Layers; --- Part 10.Test Methods – Methods for Determining Minimum Ignition Energy of Dust/Air Mixtures. This Part is Part 1 of GB 12476. This Part was drafted as per the rules specified in GB/T 1.1-2009. This Part uses re-drafting method to modify and adopt IEC 61241-0.2004 Electrical Apparatus for Use in the Presence of Combustible Dust – Part 0.General Requirements (English Edition I). However, this Part is not the modification in a full meaning of GB 12476.1-2000.The major technical contents of GB 12476.1-2000 are replaced by GB 12476.5-2013 Electrical Apparatus for Use in the Presence of Combustible Dust – Part 5.Protection by Enclosures “tD”. Technically, this Part has the following technical differences and causes with IEC 61241-0.2004. --- Taking into account the difference BETWEEN the type approval of the inspection and certification of explosion-proof electrical equipment in China AND the IEC international standard (there is no provision on the approval procedure), the type approval procedure for explosion-proof electrical equipment in China is the explosion-proof certification system. Therefore, the inspection procedure for obtaining the explosion-proof certificate has been added to any Clause on manufacturer’s responsibility, see Appendix A. This Part was proposed by China Electrical Equipment Industrial Association. This Part shall be under the jurisdiction of National Technical Committee for Standardization of Explosion Protected Electrical Apparatus (SAC/TC 9). Drafting organizations of this Part. Nanyang Explosion Protected Electrical Apparatus Research Institute; and China National Quality Supervision and Test Center for Explosion Protected Electrical Products. Chief drafting organizations of this Part. CZ Explosion-Proof Electrical Appliances Co., Ltd.; Dianguang Explosion-Proof Technology Co., Ltd.; Warom Group Co., Ltd.; Nanyang Explosion Protection Group Co., Ltd.; Xinliming Explosion Prevention Electric Appliances Co., Ltd.; Shanghai Baolin Explosion-Proof Electric Co., Ltd.; and Zhejiang Chuangxin Electric Machine Co., Ltd. Chief drafting staffs of this Part. Wu Jianguo, Huang Jianfeng, Shi Xiaoxian, Li Jiang, Bai Zhaohao, Zheng Zhenxiao, Wen Zhenke, Li Shuchao, and Chen Rui. The historical edition replaced by this Standard is as follows. --- GB 12476.1-2000.1 ScopeThis Part of GB 12476 specifies general requirements for the design, construction, testing and marking of electrical apparatus protected by any recognized safeguard technique for use in areas where combustible dust may be present in quantities that could lead to a fire or explosion hazard.2 Normative ReferencesThe 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 70.1-2008 Hexagon Socket Head Cap Screws (ISO 4762.2004, MOD) GB/T 1040.2-2006 Plastics - Determination of Tensile Properties - Part 2.Test Conditions for Molding and Extrusion Plastics (ISO 527-2.1993, IDT)3 Terms and DefinitionsFor the purposes of this Part, the following terms and definitions apply. Dust, fibers or flying that can burn or glow in air and could form explosive mixtures with air at atmospheric pressure and normal temperatures. Mixture with air, under atmospheric conditions, of flammable substances in the form of dust, fibers or flying in which, after ignition, combustion spreads throughout the unconsumed mixture.4 ConstructionElectrical apparatus for use in potentially explosive dust atmospheres shall comply with the requirements of this standard. Enclosures for use in Zone 20 or 21 which can be opened more quickly than the time necessary.5 TemperaturesFor electrical apparatus, the maximum surface temperature shall be specified in relevant documentation according to 23.2. In addition to the maximum surface temperature required in 5.1, the maximum surface temperature may be stated for a given depth of layer, TL, of dust surrounding all sides of the apparatus, unless otherwise specified in the documentation, and marked according to 29.2.1h).6 Enclosure MaterialsThe following requirements apply to non-metallic enclosures and non-metallic parts of enclosures on which the type of protection depends. Materials used in the construction of enclosures of electrical apparatus to be used in explosive dust atmospheres shall not contain, by weight, more that 7.5 % in total of magnesium and titanium. Threaded holes in enclosures for fasteners which secure covers intended to be opened in service for adjustment, inspection and other operational reasons may only be tapped in the material of the enclosure when the thread form is compatible with the material used for the enclosure.7 FastenersParts necessary to achieve a standard type of protection or used to prevent access to uninsulated live parts shall be capable of being released or removed only with the aid of a tool. Fastening screws for enclosures of materials containing light metals may be made of light metal or plastics if the material of the fastener is compatible with that of the enclosure.8 Interlocking DevicesInterlocking devices used to maintain a type of protection shall be so constructed that their effectiveness cannot readily be defeated by the use, for example, of a screwdriver or pliers.9 BushingsBushings in enclosures used as connection facilities and which may be subjected to a torque while the connection or disconnection is being made shall be mounted in such a way that all parts are secured against turning. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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