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GB 3836.15-2024: Explosive atmospheres - Part 15: Specification of electrical installations design, selection and erection Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 3836.15: Historical versions
Similar standardsGB 3836.15-2024: Explosive atmospheres - Part 15: Specification of electrical installations design, selection and erection---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/GB3836.15-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.260.20 CCS K 35 Replacing GB/T 3836.15-2017 Explosive atmospheres - Part 15.Specification of electrical installations design, selection and erection Issued on. JULY 24, 2024 Implemented on. AUGUST 01, 2025 Issued by. State Administration for Market Regulation; National Standardization Administration. Table of ContentsForeword... 3 Introduction... 7 1 Scope... 12 2 Normative references... 12 3 Terms and definitions... 12 4 General... 20 5 Design and selection of electrical equipment... 25 6 Equipment installation... 34 7 Additional requirements... 47 8 Initial inspection... 68 Appendix A (Informative) Hybrid mixtures... 70 Appendix B (Normative) Equipment initial inspection table... 72 Appendix C (Normative) Assessment of potential discharge risk of stator winding - Ignition risk factor... 79 References... 801 ScopeThis document specifies specific requirements for the design, selection, installation, initial inspection of electrical installations in or related to explosive atmospheres. This document applies to fixed, portable, mobile, individual electrical equipment. This document does not apply to. - Coal mines (the design, selection, installation of electrical equipment in coal mines can refer to this document); Note 1.For specific requirements, see the Coal Mine Safety Regulations. - Dust environments formed by inherently explosive substances and explosives or self-igniting substances (such as the manufacture and processing of explosives); - Medical rooms. Note 2.Appendix A provides additional guidance on the hazards of dust or flying catkins mixed with flammable gases or vapors.2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document. GB/T 3836.1 Explosive atmospheres - Part 1.Equipment - General requirements GB 3836.16 Explosive atmospheres - Part 16.Specification of electrical installations inspection and maintenance3 Terms and definitionsThe terms and definitions defined in GB/T 3836.1, as well as the following terms and definitions, apply to this document. 3.1 General 3.2 Hazardous areas 3.2.4 Hybrid mixture A mixture of flammable gas or vapor and flammable dust. 3.2.5 Maximum permissible surface temperature The maximum temperature that the surface of electrical equipment is allowed to reach in order to avoid ignition in actual operation. Note. This definition applies only to dust and not to gas. Whether it is a dust cloud or a dust layer, its maximum permissible surface temperature depends on the type of dust, including the thickness of the dust layer and the safety factor applied (see 5.4.3). 3.6 Pressurized enclosure 3.6.1 Pressurized enclosure "p" An enclosure that keeps the internal shielding gas pressure higher than the external atmospheric pressure, to prevent the external atmosphere from entering.4 General4.1 General requirements The design, selection, installation of electrical equipment in hazardous areas shall comply with the provisions of this document. 4.2 Documents Verification dossier shall be established for all electrical equipments, indicating the information of the manager of the verification dossier, the storage location, etc., so that they can be checked at any time when needed. The verification dossier shall include at least the following information or documents. 4.3 Equipment qualification guarantee 4.4 Personnel competence and qualifications 4.4.1 General The design, selection, installation of electrical installations covered by this document shall only be carried out by professionally trained personnel whose knowledge, skills, qualifications shall comply with the provisions of this clause and shall be appropriate to the type of work performed. Personnel shall receive appropriate training and continuing education on a regular basis. 4.4.2 Knowledge and skills 4.4.3 Qualifications 4.4.3.1 General Different explosion-proof categories require different explosion-proof knowledge. The personnel's ability shall be consistent with the category of explosion-proof technology that needs to be mastered; the specific ability requirements of relevant personnel shall be clarified. 4.4.3.4 Operators/technicians The operator/technician shall be able to provide proof of competence, to prove that he/she has met the knowledge and skills requirements specified in 4.4.2.3 related to the explosion-proof type and/or the type of equipment involved. At the same time, documents shall be provided to prove the ability to perform the following tasks. 4.4.4 Assessment The ability of the person in charge, operator, designer shall be assessed according to the time period required by the standard or the user, to fully prove that they have the following conditions.5 Design and selection of electrical equipment5.1 Document requirements In order to select electrical equipment suitable for hazardous areas, the following documents are required. 5.2 Design and selection based on EPL 5.2.1 General When new devices or equipment are used, the compliance of the equipment shall be verified in accordance with 4.3.The EPL in the area classification document shall follow the relationship between EPL and area in Table 1. 5.3 Design and selection according to equipment category Electrical equipment shall be selected according to Table 3. 5.4 Design and selection based on the ignition temperature of gas, vapor or dust and ambient temperature 5.5 Design and selection including external influences When the equipment needs to meet other environmental conditions, such as waterproof, dustproof, corrosion-resistant, low temperature, high temperature, high altitude, etc., other protection requirements shall be adopted and verified by relevant tests. 5.6 Design and selection of specific equipment 5.6.2 Rotating motor 5.6.3 Lamps The type or rating of the lamp shall be selected according to the required temperature group. "e" type lamps with fluorescent lamps and electronic ballasts shall not be used in places requiring temperature group T5 or T6, or places where the ambient temperature is greater than 60 °C. 5.6.4 Plug and socket terminals Plug and socket terminals shall not be installed in places requiring EPL Ga and Da. In places requiring EPLDB and Dc, the installation of the socket terminals shall not allow dust to enter the socket regardless of whether the plug is installed in the socket. The installation angle of the socket terminals shall not exceed 60° from the vertical line, meanwhile the opening shall be downward. 5.6.5 Batteries and battery packs Batteries and battery packs shall only be charged in non-hazardous areas, unless charging in hazardous areas is permitted in the certificate and manufacturer's instructions.6 Equipment installation6.1 Prevention of dangerous (ignitable) sparks 6.1.1 Light metal structural materials The composition of metal installation materials (such as cable trays, mounting plates, weather shields and enclosures) shall comply with the requirements of Table 5. 6.1.2 Hazards of live parts Inadvertent contact with exposed live parts shall be prevented, except for parts of a single intrinsically safe circuit. 6.1.3 Hazards of exposed external conductive parts 6.1.4 Equipotential bonding 6.1.5 Static electricity 6.1.5.1 General External non-metallic materials, which are used for structural or protective purposes and not part of explosion-proof electrical equipment (such as plastic-coated cable trays, plastic mounting plates, plastic guards and enclosures), shall be anti-static. 6.1.6 Cathodic protection of metal parts Metal parts in locations requiring EPL Ga or Da levels shall not be cathodically protected, unless they are specifically designed for this application. 6.2 De-energizing and galvanic isolation 6.2.1 Overview The requirements of 6.2 do not apply to intrinsically safe circuits. 6.3 Cables and wiring systems 6.3.2 Cables 6.3.3 Conduit system Conduit seals shall be provided where the conduit enters or leaves the hazardous area. There shall be no joints, pipe joints or other accessories between the seal and the boundary of the hazardous area. 6.3.4 Installation requirements 6.3.4.1 Circuits passing through hazardous areas When a circuit passes through a hazardous area from a non-hazardous area to another non-hazardous area, the wiring system in the hazardous area shall be compatible with the EPL requirements of the hazardous area. 6.4 Cable entry system and plugging elements 6.4.1 General The selection of cable entry devices and plugging elements shall be consistent with the equipment manual and explosion-proof certification requirements.7 Additional requirements7.1 Additional requirements for flameproof enclosure "d" 7.1.1 Equipment for specific gases Equipment marked for specific gases, or equipment marked with equipment category and specific gases, when used in specific gas environments, shall be installed in accordance with the requirements for specific gas equipment category. For example, equipment marked "IIB + H2" for hydrogen environments shall be installed as IIC equipment. 7.1.3 Protection of flameproof joint surfaces The flameproof joint surfaces shall be protected in accordance with the manufacturer's documents. Gaskets are permitted only if specified in the manufacturer's documentation. Flameproof joint surfaces shall not be painted. 7.1.4 Conduit system The flameproof seal of the conduit shall be one of the following types. 7.2 Additional requirements for increased safety type "e" For the combination of terminals and conductors in general terminal boxes and junction boxes, it shall be ensured that the heat caused by the power loss in the enclosure does not cause the temperature to exceed the temperature group specified for the equipment. One of the following measures can be taken. 7.3 Additional requirements for intrinsically safe type "i" 7.3.1 Installations complying with EPL Gb or Gc and Db or Dc 7.3.3 Simple devices Simple devices are not related to the equipment protection level. Simple devices shall be clearly marked by adding durable labels. 7.3.4 Junction box8 Initial inspectionAfter the electrical installation is completed and before the first use, the selection and installation of the equipment shall be initially inspected in accordance with Appendix B. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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