Class I, Zone 0 or Zone 1 locations may not abut Class I, Division 1 or Division 2 locations. Zone Hazardous Location 2 Table of . >> NEC: Class I, Division 2, Group D. | IEC: Zone 2, Group II. November 2020 Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 September 2019. Industrial electrical equipment for hazardous area has to conform to appropriate parts of standard: IEC-60079 for gas hazards, and IEC-61241 for dust hazards. April 2022 Zone 1 is an area that is classified 'as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapours and mists is likely to occur occasionally during normal operation', whereas Zone 2 is an area that is classified 'as a place in which an explosive atmosphere consisting of a mixture Magnesium, Aluminum, Titanium etc. Equipment should be tested to ensure that it does not exceed 80%[according to whom?] International Electrotechnical Committee (IEC) Hazardous Area Classification. 3: Text that is followed by a reference in brackets has been extracted from NFPA 497-2017, All other applicable rules contained in this, Where the term "Class I" is used with respect to, Informational Note: The term "Class I" was originally included as a prefix to, All areas in industrial occupancies designated as hazardous (classified). Terminology for both hazards and protective measures can vary. Explosion Hazardous Areas are divided into zones according to risk probabilities. area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. Horizontal. 41 gas explosions per year occur within the UK and app. It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . Atmospheres containing combustible flyings. Not only are hazardous areas classified by Class (nature of the hazardous material,) and Division . The Zone system of hazardous area classification, defines the probability of the hazardous material, gas, or dust, being present in sufficient quantities that can generate explosive or ignitable mixtures. . Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. 0. No hidden fees. Note to paragraph (c)(3) of this section: The National Electrical Code, NFPA 70, contains guidelines for determining the type and design of equipment and installations that will meet this requirement. Protecting against fire and explosion is of interest for both personnel safety as well as reliability reasons. . Atmosphere containing a flammable gas, a flammable liquid produced vapor, or a combustible liquid produced vapor mixed with air that may burn or explode, having either a MESG (Maximum Experimental Safe Gap)1) value less than or equal to 0.45 mm or aMIC (Minimum Igniting Current)2) ratio less than or equal to 0.40 - such as hydrogen or fuel and combustible process gases containing more than 30% hydrogen by volume - or gases of equivalent hazard such as butadiene, ethylene oxide, propylene oxide and acrolein. Both external and internal temperatures are taken into consideration. Offshore Accommodation Module The information contained in this article is intended for general information purposes only and is based on information available as of the initial date of publication. Zone 1 . The Zone system has wider use in the chemical and petrochemical industries. area in which an explosive gas atmosphere is present continuously, or for long periods, or frequently (more than 10% of the time). Get more great content like this sent to your inbox. In effect it is any method which can be shown to have the required degree of safety in use. Locations are thus classified by type and risk of release of gas, vapor, or dust. This means that the electrical equipment is safe for use within these area by applying special protection strategies. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. SPARTANs Zone 1 part code begins SPX, Zone 2 SPZ and industrial products having a SPI prefix. .14 . Equipment shall be marked in accordance with paragraph (g)(5)(ii)(A) and (g)(5)(ii)(B) of this section, except as provided in (g)(5)(ii)(C). Some other standards have more quantitative methods which require more knowledge of the plant, an example is the IEC standard 60079-10-1. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. March 2022 Each room, section, or area shall be considered individually in determining its classification. Hazardous Area Classification (HAC) is as follows: Definitions of hazardous area are different as per IEC and NEC. Well recognized and clear IEC Standard IEC 60079-10-2:2015 Hazardous Area Classification for explosive dusts Significant influence on spending's for safety . Standards and regulations exist to identify such locations, classify the hazards, and design equipment for safe use in such locations. Group C materials have a MESG less than 0.75mm and a MIC ratio less than 0.80 (but greater than 0.40, which would put it in Group B.) >> For Gas/Vapor this would be Zone 2. Safe for the hazardous (classified) location. To make this even easier to understand, take a look at the diagram of a typical petrol station below where we have identified the areas that are classified as Zone 0, Zone 1 and Zone 2. NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. Zone 22 Zone 21 Zone20 A hazardous atmosphere formed by dust cloud in air is not likely to occur in . The CE mark is complemented with the Ex mark: A yellow-filled hexagon with the Greek letters (epsilon chi), followed by the Group, Category, and, if Group II, G or D (gas or dust). Category 3 equipment may only be used in zone 2 areas. we will look at what defines Zone 0, Zone 1 and Zone 2 hazardous area classifications and the considerations for specifying lighting into each area. Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. Container Standards December 2021 Definition of hazardous area zones (AS/NZS 60079.10): Zone 0 In this system, two bare wires were run along the length of a drift, and any miner desiring to signal the surface would momentarily touch the wires to each other or bridge the wires with a metal tool. EN 16985 concerning spray cabins and powder coating cabins, EN 12779 related to extraction systems for hot sawdust and chips, EN 60079-10 series, 2020 version for gas and dust explosion hazard, NPR 7910 series for gas and dust explosion hazard based on EN 60079-10-1, 2015 version, EN 13617 for fuel dispensers at filling stations. Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . In the IEC standards hazardous areas are classified into zones based upon the frequency and duration of an explosive atmosphere. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. In North America the suitability of equipment for the specific hazardous area must be tested by a Nationally Recognized Testing Laboratory, such as UL, FM Global, CSA Group, or Intertek (ETL). An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. Comparisons between the two systems are not easily accomplished. In Northerm America, instead of the zone classification system, the Class/Division system is used. The overpressure is monitored, maintained and controlled. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. As a result, all hazardous area equipment must be designed with hazardous area zone classifications in mind, as the zone governs the level of protection and precaution required. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. Zone defines thegeneral nature if it is a gas or dust and theprobabilityof hazardous material being present in an ignitable concentration in the surrounding atmosphere. Employers may use the zone classification system as an alternative to the division classification system for electric and electronic equipment and wiring for all voltage in Class I, Zone 0, Zone 1, and Zone 2 hazardous (classified) locations where fire or explosion hazards may exist due to flammable gases, vapors, or liquids. So it is quite obvious that explosions should be prevented as much as possible and still work has to be done to achieve this. For more detailed assessments or for situations where no specific industry standards are available , like the chemical or pharmaceutical sector and also specific installation for oil and gas industries, a more quantitative approach can be used. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Equipment is non-incendive or non-sparking. Equipment is placed into protection level categories according to manufacture method and suitability for different situations. Hazardous classified locations are areas where the possibility of fire or explosion hazards may exist under normal or abnormal conditions because of the presence of flammable, combustible or ignitable gases, vapors, liquids, dust, or fibers/flyings. Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. Hazardous areas are classified into 3 zones based upon the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: Zone 0 Area in which an explosive gas atmosphere is present continuously or for long periods or frequently. Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus. November 2022 So, it is good to know that when a flammable substance concentration exceeds the LEL, it will not automatically lead to an explosion with the highest Pmax. A Class I, Division 1 or Division 2 location may be reclassified as a Class I, Zone 0, Zone 1, or Zone 2 location only if all of the space that is classified because of a single flammable gas or vapor source is reclassified. Documentation requirements likewise vary. October 2021 Electrical equipment can and does cause fires and/or explosions in certain atmospheres. Since the changes to the code, hazardous locations with gases or vapors (Class I) present can be reclassified as Zone 0, 1 or 2. FEA In some cases, the hazardous atmosphere is present all the time, or for long periods. |MWD/LWD Cabin However, the following provisions modify this marking requirement for specific equipment: Fixed lighting fixtures marked for use in Class I, Division 2 or Class II, Division 2 locations only need not be marked to indicate the group; Fixed general-purpose equipment in Class I locations, other than lighting fixtures, that is acceptable for use in Class I, Division 2 locations need not be marked with the class, group, division, or operating temperature; Fixed dust-tight equipment, other than lighting fixtures, that is acceptable for use in Class II, Division 2 and Class III locations need not be marked with the class, group, division, or operating temperature; and. coal and charcoal), Group G Nonconductive dusts (eg. Explosion protection must be ensured during normal operation. [12], International Electrotechnical Commission, Occupational Safety and Health Administration, National Electrical Manufacturers Association, "Hazardous Area Classification and Control of Ignition Sources", "Hazardous (Classified) Locations NEC Articles 500 through 517", https://en.wikipedia.org/w/index.php?title=Electrical_equipment_in_hazardous_areas&oldid=1134828101, ignitable concentrations of combustible dust can exist, under normal conditions, ignitable concentrations of combustible dust are unlikely to exist normally, ignitable fibers, or materials producing combustible flyings, are handled, manufactured or used, easily ignitable fibers are stored or handled. A Zone 0 location is a location in which one of the following . Adapters shall be used for connection to conduit or NPT-threaded fittings. Equipment of the nonheat-producing type, such as junction boxes, conduit, and fittings, and equipment of the heat-producing type having a maximum temperature not more than 100 C (212 F) need not have a marked operating temperature or temperature range; Electric equipment suitable for ambient temperatures exceeding 40 C (104 F) shall be marked with both the maximum ambient temperature and the operating temperature or temperature range at that ambient temperature; and. ignitable concentrations of dust, fibers, or flyings are present for long periods of time, ignitable concentrations of dust, fibers, or flyings are likely to exist under normal conditions, ignitable concentrations of dust, fibers, or flyings unlikely to exist under normal conditions, Metal dusts, such as magnesium (Division 1 only), Carbonaceous dusts, such as carbon & charcoal, Non-conductive dusts, such as flour, grain, wood & plastic, Ignitible fibers/flyings, such as cotton lint, flax & rayon, Ignitible fibers or flyings, such as cotton lint, flax & rayon. An oversimplification of this example is shown in Table 1. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. Type of protection "n" -- This protection technique is permitted for equipment in the Class I, Zone 2 locations for which it is approved. And safety must be guaranteed in the case of two faults occurring independently of each other. . The substance referred to by classhas a high probability of producing an explosive or ignitable mixture due to it being present continuously, intermittently, or periodically or fromthe equipment itself under normal operating conditions. As a guide for Zone 0, this can be defined as over 1000 hours/year or >10% of the time. A more quantitative method is described in IEC 60079-10-1 but also more sophisticated numeric mathematical models can be used like Computational Fluid Dynamics. February 2022 Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as shown in the illustration below. Many people have heard terms like Class I, Division 2, Group E, or ATEX zone 21 but many of our customers only know what certification they require with little understanding of what they mean, so we thought it would be appropriate to write a blog post to help customers understand the broader implications of these terms. A60 Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. For example, in the US by the Occupational Safety and Health Administration. Quick Tips #124.1. NEC Div 1 Zone 1 Div 2 Zone 2Flammable during normal operation Most Safer Zone IEC Zone 0 DESRIPTIONHighly Flammable for long period DEFINITIONFlammable atmosphere present continuously (Typically 1000 hours / year). Carbon monoxide, ether, hydrogen sulfide, . . The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. Class II combustible dusts are grouped into one of three (3) groups: E combustible metal dusts, F combustible carbonaceous dusts or G other combustible dusts. The International Electrotechnical Commission publishes the 60079 series of standards[2] which defines a system for classification of locations, as well as categorizing and testing of equipment designed for use in hazardous locations, known as "Ex equipment". 15 4. The types of protection are subdivided into several sub classes, linked to EPL: ma and mb, px, py and pz, ia, ib and ic. This level of risk is represented by classifying the hazardous area as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist atmospheres) or Zone 21 or Zone 22 for dust atmospheres. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Powder Filling "q" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Canada has a similar system with CSA Group standard C22.1, the Canadian Electrical Code, which defines area classification and installation principles. Groups E, F, and G are for dusts and flyings (Class II or III). If you require more information on the different variants in the SPARTAN range, or you would like to discuss your application in more detail, you can call us on +44 (0) 1670 520055 or send an email to sales@raytecled.comwhere we will happily answer any questions you have. This temperature is used for classification for industry and technology applications.[6]. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Area Classification. No long-term contract. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. 2: For the requirements for electrical and electronic. In recent years also the EPL is specified for several kinds of protection. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. Informational Note No. The four steps involved in hazardous area classification are: Determine the type of hazard or "class" that might be presentcombustible gas (Class I), combustible dust (Class II), or fibers (Class III). Only emails and answers are saved in our archive. Sources a headlamp, rather than a dedicated fixed luminaire. Zone 0 is reserved for those areas continuously hazardous (e.g., inside a vented fuel tank), so other Division 1 areas would be classified as Zone 1. And there are three corresponding zones for dust: Zone 20, Zone 21 and Zone 22. In Europe the label must show the CE mark and the code number of the certifying/notified body). A: Yes. Intrinsic safety designs equipment to operate using minimal energy, insufficient to cause ignition. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. A hazardous area classification drawing (also known as an area classification drawing) outlines the classifications of areas where flammable liquids, gasses or vapors are handed, processed or stored. August 2021 The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. Group is divided in three groups where Group I is reserved for mining locations. The escaping (hot) gases must sufficiently cool down along the escape path that by the time they reach the outside of the enclosure not to be a source of ignition of the outside, potentially ignitable surroundings. Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. The definition of the hazardous area zones represent the likelihood of hazardous gas, dust or other hazards being present in a working area.
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