ATEX Explained Leaflet
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Ex EXPLAINED Specific mark for Explosion Protection Equipment Group (Mining) Equipment Category (Mining) Equipment Group (Industrial) Equipment Category (Industrial) Defines suitability of use of Group II equipment in gas and/ or dust atmospheres Explosion Protected Equipment Protection Concept Equipment Protection Level Equipment Protection Level Very high protection (Ma) Hazard Group Hydrogen/ Acetylene Very high protection (Da) Industrial Dust Hazards Equipment Group and Category identify the areas in which equipment may be safely used. AREA CLASSIFICATION Area Classification Gases Zone Criteria present continuously, for long periods ( 1000hrs per annum) or frequently likely to occur in normal operation, occasionally ( 10hrs, < 1000hrs per annum) < unlikely to occur in normal operation, if it does will only be for short periods ( < 10hrs per annum) CLASSIFICATION OF HAZARDOUS AREAS To EN/IEC 60079-10 Hazardous areas are classified into zones on the basis of the frequency and duration of the occurrence of an explosive atmosphere. Durations on table are typical. Temperature Classification Equipment Protection Level Ambient Temperature Range ‘CE’ marking is used within the European Union to identify products that comply with all relevant EC/EU Directives, with the aim of promoting free trade and regulating safety. Only equipment that is ‘CE’ marked compliant with the ATEX Equipment Directive may be sold for use in potentially explosive atmospheres within the EU. The Directive scope includes electrical and mechanical equipment for use in mining and industrial applications, both on and offshore and considers risks of ignition from potentially explosive gas, vapour, mist and dust atmospheres. Compliance of products to the ATEX Equipment Directive, through conformity assessment, is generally in two stages: design and production. A common route to product design compliance is by meeting the requirements of all relevant Harmonised EN standards. The ATEX Directive requires that latest advancements in technical knowledge and ‘state-of-the-art’ thinking are implemented without delay, so Harmonised EN standards can change regularly. Manufacturers of equipment for safe use in potentially explosive atmospheres are under a legal responsibility to ensure timely compliance with any such changes affecting their products; in some cases this may result in re-design and re-certification. Once compliance with the relevant Directives is complete and the manufacturer has issued the EC/EU Declaration of Conformity, the ‘CE’ mark is applied and the product placed on the market. ATEX Equipment Directive 94/9/EC was repealed on 19 April 2016, ATEX Directive 2014/34/EU became applicable from 20 April 2016. This is the result of a legislative realignment and had limited relevance to the manufacturer or user, other than requiring the EC/EU Declaration of Conformity to refer to the correct Directive on the relevant date. IECEx CERTIFICATION SCHEME The objective of the IECEx Certification Scheme is to facilitate international trade in equipment for use in explosive atmospheres, while maintaining the required level of safety and international confidence in the product assessment process. Equipment certification is achieved by meeting relevant international IEC standards (mirror standards to those used in ATEX) and results in access to over 30 member countries that accept the Scheme (subject to national deviations). IECEx is a “live” scheme with a database listing all current product certificates published online. ATEX WORKPLACE DIRECTIVE & DSEAR The 99/92/EC ATEX Workplace Directive is a legal framework providing protection for property and workers in potentially explosive gas, vapour, mist and dust atmospheres within the EU. It lists a set of obligations and safety measures for employers, requiring the adoption of a coherent risk assessment based strategy for the prevention of explosions. Safety measures to be applied in service Explosion Protected Equipment Powder filled Equipment sub-grouping segregates gases according to ease of ignitability by sparks or flames in a gas/air mixture. These apply to flameproof Ex d and intrinsically safe Ex ia/ib/ic equipment only. Increased safety Intrinsic safety Non-incendive: 1 nA: Non sparking 1 1 nR: Restricted breathing 1 nC: Enclosed break Potentially Explosive Atmosphere TEMPERATURE CLASS Temperature class relates to the hot surface ignition temperature of a particular explosive gas, vapour or mist atmosphere. It must not be exceeded by the temperature classification of the equipment intended to be used in that atmosphere. Hot surfaces can ignite explosive atmospheres Risk of Ignition 450ºC Optical radiation protection: 3 is: Inherently safe 3 pr: Mechanically protected 3 3 sh: Interlock / shutdown Dust ignition protection4 4 by enclosure Explosion Protected Equipment Protection Concept Dust Group Maximum Surface Temperature Equipment Protection Level Ingress Protection Level Marking 7 Ignition within the apparatus 7 7 enclosure is contained and will not ignite surrounding explosive atmosphere 8 Special protection 8 Explosive atmosphere excluded 8 by surrounding ignition source 8 8 with pressurised inert gas 9 11 Energy in circuit and 11 temperature on components reduced to a safe level Will not ignite explosive gas in normal operation, faults unlikely to occur Flammable atmosphere excluded by encapsulating the ignition source in resin Design excludes the ingress of explosive dusts Equipment protection by special protection “s” Acetic acid Acetone Acetylene Ammonia Benzene Butane Carbon Monoxide Cychlohexane Ethanol (ethyl alcohol) Ethylene Gas/Vapour Temperature Hydrogen Kerosene Methane (industrial) Methanol Petrol Petroleum Propane Toluene Turpentine Xylene Dust Type Aluminium Blasting Dust (Paint Shreds) Coal Flour (Wheat) Grain Iron Powder Paper Fibre PVC Resin (Epoxy) Rubber Soot Starch (Maize) Sugar Wood (Flour) Dust Group Dust Layer (5mm) – minimum ignition temperature (°C) Dust Cloud – minimum ignition temperature (°C) IIIC IIIB IIIB IIIB IIIA IIIC IIIA IIIB IIIB IIIB IIIB IIIB IIIB IIIB IECEx Certificate ExCB – IECEx Certification Body Year Certificate Issued Serial Number Certificate Number Suffix X Suffix denotes special conditions of certification – refer to certificate. U Suffix denotes Ex component approval. NOTIFIED BODIES ATEX Notified Body Notified Bodies are appointed by governments of individual EU countries as responsible to carry out functions specified in the ATEX Equipment Directive, such as EU type examination of equipment and quality assurance assessment of equipment production. IECEx Certification Body (ExCB) Organisations successfully completing the IECEx assessment process are approved to operate within the IECEx Certified Equipment Scheme and to issue IECEx Test Reports (ExTRs), IECEx Quality Assessment Reports (QARs) and the Online Certificate of Conformity. SGS Baseefa is responsible for the quality assurance assessment of equipment manufactured by the Wolf Safety Lamp Company and, under ATEX, is identified by the notified body number (0589) below the CE mark on Wolf products. RESOURCES AND STANDARDS ADDITIONAL RESOURCES A guide to DSEAR, published by the Health and Safety Executive can be downloaded at: http://www.hse.gov.uk/fireandexplosion/dsear.htm IECEx System website: www.iecex.com ASSOCIATED STANDARDS Explosive Atmospheres. Explosion prevention & protection Basic concepts and methodology EXPLOSIVE DUST ATMOSPHERES PETROL STATION IEC/EN 60079-10-1 IEC/EN 60079-10-2 IEC/EN 60079-14 IEC/EN 60079-17 IEC/EN 60079-20-1 Standards available from: British Standards Institution, 369 Chiswick High Road, London W4 4AL www.bsigroup.com DECANTING OF COMBUSTIBLE MATERIAL FROM CONTAINER TO CONTAINER DECANTING OF FLAMMABLE LIQUID FROM CONTAINER TO CONTAINER Electrical equipment for use in potentially explosive atmospheres Classification of areas – Explosive Gas Atmospheres Classification of areas – Explosive Dust Atmospheres Electrical installations Inspection and maintenance of electrical installations Material characteristics, gases and vapours, test methods and data These diagrams show how hazardous area zones may occur in typical circumstances. FLAMMABLE MATERIAL IN LIQUID FORM A copy of the DSEAR regulations is available at: http://www.hmso.gov.uk/si/si2002/20022776.htm PETROL STATION FORECOURT Certificate Number Suffix The 99/92/EC ATEX Workplace Directive may be found on the following website: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2000:023:0057:0064:EN:PDF A more comprehensive list of gases and vapours is provided in IEC 60079-20-1 Serial Number 0 2nd Numeral Protection against water ATEX Certificate The 2014/34/EU ATEX Equipment Directive may be found on the following website: http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32014L0034&from=EN 1st numeral and 2nd numeral combined to identify level of ingress protection, e.g. dust tight, protected from high power water jets/heavy seas Year Certificate Issued IGNITION TEMPERATURES FOR COMMON COMBUSTIBLE DUSTS Ex equipment selection for use in gases, vapours, mists or dusts must take into consideration the environmental conditions of the area in which it is to be used. Apparatus resistance to ingress of both solid bodies and water is identified by use of an ‘IP rating’. 1st Numeral Protection against solid bodies E IECEx CERTIFICATE OF CONFORMITY NUMBER Group III electrical equipment is marked with a temperature with ‘T’ prefix detailing the actual maximum temperature that may be found on any surface accessible by a potentially explosive dust atmosphere. Ignition temperature of a specific dust hazard must be higher than maximum surface temperature displayed on electrical equipment. INGRESS PROTECTION (IP) CODE to IEC/EN 60529 Gas Temperature Group Class Ignition temperatures will vary dependent on the exact characteristics of the dust and the environment it is in. APPARATUS GROUPS AND TEMPERATURE CLASSES FOR COMMON EXPLOSIVE GASES AND VAPOURS Gas Temperature Group Class X Suffix denotes special conditions of certification – refer to certificate. U Suffix denotes Ex component approval. Check the GESTIS-DUST EX database of ‘Combustion and Explosion Characteristics of Dusts’ for more details at http://www.dguv.de/ifa/GESTIS/GESTIS-STAUB-EX/index.jsp. Potentially Explosive Atmosphere Gas/Vapour Temperature MAXIMUM SURFACE TEMPERATURE AMBIENT TEMPERATURE Ex equipment has a temperature class based on use in an ambient of -20°C to +40°C unless otherwise stated e.g. -30°C ≤Ta≤40/55°C Baseefa Notified body responsible for EC/ EU-Type Examination (Test House) D EC/EU TYPE EXAMINATION CERTIFICATE NUMBER Explosion Protected Equipment Group III electrical equipment is intended for use in explosive dust atmospheres other than mines, with subdivision according to the nature of the dust. Conductive Dusts GROUP III DUST SUBDIVISION Protection of equipment and transmission systems using optical radiation Non-conductive Dusts Protection concept identifies the means by which explosion protection is achieved. Combustible Flyings Potentially Explosive Atmosphere Design excludes the possibility 11 of incendive arcs, sparks 11 hot surfaces or 11 10 Explosive gas excluded by 10 immersing ignition source in oil 10 9 9 Explosive gas excluded by immersing 9 ignition source in sand 9 Typical Hazard IEC/EN Standard Flameproof flange gap on Ex d equipment DUST GROUPS General electrical safety requirements for construction, testing and marking of electrical equipment and components 7 used in Ex atmospheres DUST ZONE Explosion Protected Equipment Explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist, or a cloud of combustible dust in air. Ex MARKING FOR EXPLOSIVE DUST ATMOSPHERES to EN60079-0 In the UK the ATEX Workplace Directive has been implemented as an element of The Dangerous Substances and Explosive Atmospheres Regulation 2002 (DSEAR). General Requirements ATEX EQUIPMENT DIRECTIVE Applicable Concepts Note: ‘Ex’ and Protection Concepts are not marked if a ‘Technical File’ from first principles is applied. Maximum Safe Gap Flameproof Ex d De-energised in Ex atmosphere Zones 0,1,2 Industrial Gas, Vapour & Mist Hazards Maximum Safe Sparking Energy Intrinsic Safety Ex ia/ib Very high protection (Ga) Ingress protection level marking Ex MARKING FOR EXPLOSIVE DUST ATMOSPHERES Replacement parts specification PROTECTION CONCEPTS FOR ELECTRICAL APPARATUS Typical Hazard Serial/batch number incorporating year of construction Wolf Safety Lamp Co. Ltd. Sheffield, S8 0YA, England www.wolfsafety.com EQUIPMENT GROUP & EQUIPMENT CATEGORY ATEX ATEX Equipment Equipment Group Category Ambient temperature range Do not open in hazard area / Nicht im Ex-Bereich öffnen / Ne pas ouvrir en zone Ex Ex MARKING FOR EXPLOSIVE GAS ATMOSPHERES to EN60079 0589 = Number of Notified Body responsible for EU monitoring of production quality CE mark (ATEX marking) CE mark denotes manufacturers’ declaration of product compliance to all relevant EU Directives Ex MARKING FOR EXPLOSIVE GAS ATMOSPHERES ATEX MARKING Supplementary approval: e.g. Lloyds Type Approval (Marine) Replacement parts specification ENERGY REQUIRED TO IGNITE GAS ATEX MARKING IECEx CERTIFICATE OF CONFORMITY NUMBER WOLF ATEX TORCH WITH LED TR-35+ Lloyds Register TA Baseefa07ATEX0091X IECEx BAS 06.0089X I M1/II 1GD Ex ia I Ma/IIC T4 Ga -30°C≤Ta≤40/55°C Explosion protection mark (ATEX marking) Manufacturer’s type identification EC/EU TYPE EXAMINATION CERTIFICATE NUMBER This guide is provided to aid in the selection of Wolf lighting products for use in potentially explosive atmospheres. Information given is based on practice within the EU, as specified in the requirements of the 94/9/EC - 2014/34/EU ATEX (Equipment) Directive and the 99/92/EC ATEX (Workplace) Directive with further practice outlined for international use within the IECEx Scheme. It is the user’s responsibility to ascertain if a particular product is safe and without risk to health and safety by virtue of its location in a hazardous area, i.e. classification of zones, gas groups, ignition temperatures, etc. Both the specifier and user should be thoroughly familiar with the standards mentioned in this guide. Whilst every care has been taken in the compilation of this document, the Company regrets that it cannot accept responsibility for any errors or omissions contained herein. Readers should not rely upon the information contained in this document without seeking specific safety advice and ensuring that their own particular circumstances are in accordance with the matters set out. Wolf Safety Lamp Company Saxon Road Works, Sheffield S8 0YA, UK COMBUSTIBLE MATERIAL IN DRY FORM FUEL STORAGE TANK © The Wolf Safety Lamp Company Limited 2020. Do not reproduce without prior permission from