Atmospheres containing non-conductive dust. We don't collect information from our users. IEC 60079-10-1 covers classification of explosive gas atmospheres, and IEC 60079-10-2 explosive dust. Container Test Zone 2. with hazardous areas EC-Type Examination Certificate BAS 01 ATEX 7251 , for additional certificates see www.pepperl-fuchs.com Group, category, type of protection II (1) G D [EEx ia] IIB (-20 C Ta 60 C) [circuit(s) in zone 0/1/2] Output EEx ia IIB Voltage U0 25.9 V Current I0 184 mA Power P0 1.2 W Type of protection [EEx ia] 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. Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). These areas are in North America (United States and Canada) historically classified with the Class/Division system. In an industrial plant, such as a refinery or chemical plant, handling of large quantities of flammable liquids and gases creates a risk of exposure. Substance properties are specific for the amount of fuel needed to get an explosion when all other conditions are met. API RP 505, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1, and Zone 2 (as incorporated by reference in 250.198). This paper will discuss and review the current approaches and solutions of dealing with these HSE concerns, especially with the involvement of hazardous and potentially flammable and explosive chemicals. Flammable atmosphere expected to be present inside the storage tank continuously, hence it has been classified as zone 0. Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures. The zone classification for gases is divided into three zones, namely Zone 0, Zone 1 and Zone 2 and for dusts Zone 20, Zone 21 and Zone 22. Equipment that is listed for a Zone 0 location may be installed in a Zone 1 or Zone 2 location of the same gas or vapor. 2) MIC (Minimum Igniting Current) Ratio - The ratio of the minimum current required from an inductive spark discharge to ignite the most easily ignitable mixture of a gas or vapor, divided by the minimum current required from an inductive spark discharge to ignite methane under the same test conditions. 7: For further information on application of electrical, Informational Note No. 10: For information on electrical resistance trace heating for hazardous (classified), Informational Note No. June 2022 Feedback From Clients 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. Division 1 and 2 Zone 0, 1 and 2 A (acetylene) IIC (acetylene & hydrogen) B (hydrogen) C (ethylene) IIB (ethylene) Some manufacturers claim "suitability" or "built-to" hazardous areas in their technical literature, but in effect lack the testing agency's certification and thus unacceptable for the AHJ (Authority Having Jurisdiction) to permit operation of the electrical installation/system. Also included in the marking are the manufacturers name or trademark and address, the apparatus type, name and serial number, year of manufacture and any special conditions of use. An area where combustible dusts or ignitable fibers and flyings are not likely to occur under normal operating conditions and do so only for a short period of time. As mentioned, the first important step of achieving a safe work environment in relation to explosion safety is to identify and classify those areas, where a concentration of flammable gases or vapors within the flammable range can be present. Each chemical gas or vapour used in industry is classified into a gas group. No. . .14 . ethanol, methane or hydrogen. And safety must be guaranteed in the case of two faults occurring independently of each other. . LIFTING TEST [4], Flammability of combustible liquids are defined by their flash-point. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. For example, within the U.K. in the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) and in the U.S. in the Occupational Safety and Health Act of 1970 (OSHA). Protecting against fire and explosion is of interest for both personnel safety as well as reliability reasons. November 2020 Zone 2 hazardous areas are typically storage areas but can also be process areas. For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. 3: For further information on the classification of, Informational Note No. In some cases, the hazardous atmosphere is present all the time, or for long periods. Explosions can cause significant damage along with severe injury or worse loss of life. Ways to ensure this level of safety are non-arcing design and limitation of the temperature of the equipment. 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. These ways of protection are specified in detail within several IEC standards (IEC 60079 series) for electrical equipment. To minimize the risk of these fires or explosions, electrical/electronic equipment must be designed, tested and labeled as being acceptable for use in the areas in which it is installed. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. may exist under normal or abnormal conditions because of the presence of flammable gases or vapors, combustible dusts or ignitable fibers or flyings. Class I, Zone 0 or Zone 1 locations may not abut Class I, Division 1 or Division 2 locations. Click on the zone to learn more about the classification according to IEC 60079-10 standards. NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. This concentration is substance specific and lies normally somewhere between the LEL and UEL. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. Copryright 2023 Springer Controls Company . A spark or high heat must also be present. Iso Container In ambient conditions it is assured that oxygen is always present and thus not a factor that has to be incorporated within the hazardous area assessment. November 2021 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. May 2019 Refrigerated When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. gas, vapours, mists and dusts). Area Classification. Zone 1 if gas group & temp. Drop Test Accommodation Cabin There are three necessary components for an explosion to occur; This needs to be present in a relatively high quantity to produce an explosive mixture (e.g. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. Under the "Zone" system, hazards are defined for gas as Zone 0, 1 or 2, with 0 as the highest hazard, and for dust as Zone 20, 21 or 22, with 20 as the . the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). 0. The following content is only related to flammable substances and not to pyrotechnic substances or other instable substances, among those who can decompose. Zones compares to classes and divisions in the Class/Division system. (Hazardous Area Classification) . The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. For methane this is shown in the following figure. Australia and New Zealand use the same IEC-60079 standards (adopted as AS/NZS60079), however the CE mark is not required. Read more in our blogWhich Standards to use for Hazardous Area Classification. 5: For further information on ventilation, see NFPA 30-2018, Informational Note No. of the autoignition temperature of the hazardous atmosphere. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. July 2021 Documentation requirements likewise vary. Requirements for good HAC Drawings and Plans. The a subdivisions have the most stringent safety requirements, taking into account more than one independent component faults simultaneously. | For Gas/Vapor this would be Zone 0. Zone 0 (hazardous area) An area in which an explosive gas-air mixture is continuously present or present for long periods. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. 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. An oversimplification of this example is shown in Table 1. 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. The following Equipment Groups and Categories are applicable: Equipment in this category is only intended for use in the underground areas of mines, as well as those areas of surface installations of such mines endangered by firedamp and/or combustible dusts. It is good to be aware of the fact that the mixture of flammable gas with oxygen has an optimum point where the combustion is most severe and leads to the highest explosion pressure. The codes and standards used in this process provide guidance for selecting,. Equipment that the employer demonstrates will provide protection from the hazards arising from the flammability of the gas or vapor and the zone of location involved and will be recognized as providing such protection by employees need not be marked. 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. Cookies are only used in the browser to improve user experience. Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. Within a working area or installation an ignition can be created by many factors. Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. Hazardous Areas - North America Classification, international method of area classification, Protection Techniques for Hazardous Areas - North America, Hazardous because combustible or conductive, Atmosphere containing combustible metal dusts, including. But when we take a closer look at the graph and table, we can conclude that any explosion, can easily lead to severe damage. 1.1 Scope. Safety is ensured in the event of frequently occurring disturbances or equipment faults which normally have to be taken into account. Methane has a LEL of 4,4 vol%. Informational Note No. *unless risk assessment states a higher or lower category is required. . NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). Area classification is not simply intended to identify hazardous areas on process plants where design has already been completed using only operational and economic factors as influence,. Locations are thus classified by type and risk of release of gas, vapor, or dust. Arc-producing elements can be isolated from the atmosphere, by encapsulation in, Heat-producing elements can be designed to limit their maximum temperature below the. . Is intended for us in Zone 2 (gases) or Zone 22 (dusts). API 500/505 mostly for onshore and offshore oil and gas applications. The substance referred to by classhas a low probability of producing an explosive or ignitable mixture and is present only during abnormal conditions for a short period of time - such as a container failure or system breakdown. A room with a propane gas installation will typically be classified with the. The key difference between Divisions and Zones relate to terminations. This is also one of the first steps when composing an Explosion Protection Document. So a zone 0 is the most hazardous zone and a zone 2 is a less hazardous zone. Zone 2 - Explosive atmospheres are unlikely to occur or present only infrequently and for a short period only. November 2019 lk) are places where fire or explosion hazards may exist. 1: The term "Class I" was originally included as a prefix to, Informational Note No. These areas only become hazardous in case of an accident or some unusual operating condition. Lets take a look at what defines each zone. WHEN YOU NEED THEM. The classification process requires the participation of operations, maintenance, safety, electrical and instrumentation professionals; and the use of process diagrams, material flows, safety data sheets, and other pertinent documents. Which Standards to use for Hazardous Area Classification. Where there is potential for an explosive atmosphere, special precautions are needed to prevent fires and explosions. Dry Container Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. The colour of the luminaire body indicates the level of protection. 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. NFPA 70 NEC Zone Classification System The Zone Classification System is offered as an alternative to the Class and Division system. d : HA - ha ea OA - oa Area classification - Divisions vs. zones Continuous hazard Intermittent hazard Hazard under abnormal conditions Zone 0 Zone 1 Zone 2 Division 1 Division 1 Division 2 Hazardous locations - CEC classifications Class I Zone 0 Area The definition according to IEC60079-10-1 is "an area in which an explosive gas atmosphere is present continuously or for long periods or frequently". Zone 0Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. . The groups also indicate how much energy is required to ignite the material by energy or thermal effects, with IIA requiring the most energy and IIC the least for zone system gas groups. All equipment in Division 1 areas must have an approval label, but certain materials, such as rigid metallic conduit, does not have a specific label indicating the Cl./Div.1 suitability and their listing as approved method of installation in the NEC serves as the permission. >> NEC: Class II, Division 1, Group F. | IEC: Zone 20, Group IIC. In the United States, the most commonly followed system is the NEC (National Electric Code), while the rest of the world generally follows the IEC (International Electrotechnical Commission). Comparison of Zones and Divisions. In the IEC standards hazardous areas are classified into zones based upon the frequency and duration of an explosive atmosphere. The flash point determines if an area needs to be classified. Workshop Container, Intelligent pressurised container | MUD logging cabin, Battery energy storage system (BESS) container, Laboratory container | workshop container | Equipment containers, Temporary refuge shelter | Toxic gas refuge | Safe haven, Offshore accommodation cabin | office container, Reefer container | Refrigerated container, Intelligent waste water treatment container, IDENTIFYING ZONE 0, ZONE 1, AND ZONE 2 HAZARDOUS AREAS, Temporary refuge (TR) shelter, toxic gas refuge (TGR), Containerised waste water treatment plant. (equivalent to NEC Class I, Groups A and B), (equivalent to NEC Class II, Groups F and G), Group IIC is the most severe zone system gas group. Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus. The NEMA enclosure rating or IP code may also be indicated, but it is usually independent of the Classified Area suitability. WATER TIGHTNESS Magnesium, Aluminum, Titanium etc. The upper explosion limit of a substance is the highest concentration (in volume percentages for gases and liquids) of a gas or a vapor in air capable of producing a flash of fire in the presence of an ignition source. 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. 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. PROCESS OF CONTAINER All areas in the facility that are not Zone 0, Zone 1, or Zone 2 are considered unclassified. Note to paragraph (c)(2)(i) of this section: NFPA 70, the National Electrical Code, lists or defines hazardous gases, vapors, and dusts by "Groups" characterized by their ignitable or combustible properties. Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . Offshore Living Quarter Examples are: In another blog we, will explain how to perform Hazardous Area Classification according to the Standard EN-IEC 60079-10-1. Equipment in this category is intended for use in areas in which explosive atmospheres caused by gases, vapours, mists or air/dust mixtures are likely to occur occasionally. Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). Zones 0, 1 and 2: Atmospheres with explosive gases and vapours (AS2380; AS/NZS/IEC 60079) Zone 0 Area The definition according to IEC60079-10-1 is "an area in which an explosive gas atmosphere is present continuously or for long periods or frequently". July 2020 Youre phone isnt rated for use in hazardous areas. Hazardous areas are defined as: " Zones " under worldwide IEC standards (and their local versions, such as ATEX in Europe) " Divisions " under North American NEC standards. April 2021 Category 2 equipment may be used in zone 1 or zone 2 areas. 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". The use of EPL and ATEX Category directly is an alternative for "s" marking. This can be achieved by blanketing with nitrogen or carbondioxide. [3], Different explosive atmospheres have chemical properties that affect the likelihood and severity of an explosion. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. CLASSIFIED LOCATIONS: AREA CLASSIFICATION: AREA CLASSES: AREA GROUPS: LOCATION AS PER DIVISIONS: DIVISION 1 - Class I, Division 1 hazardous locations are defined (as per NEC code Article 500) as follows: DIVISION 2 - Class I Division 2 Locations are as follows: Area Classification by ZONES: DEFINITIONS: HAZARDOUS LOCATIONS: FREEZER 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). In the US, the independent National Fire Protection Association (NFPA) publishes several relevant standards, and they are often adopted by government agencies. 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. 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. Choose the right method for Hazardous Area Classification! Horizontal. Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. A potential few examples of this are: The air space inside a tank of petrol Refer to Fig.3 which shows the hazardous area zone classification based on hazardous gas release grade. >> NEC: Class I, Division 2, Group D. | IEC: Zone 2, Group II. Conversely if the same material is heated and handled above its flash-point, the area must be classified for proper electrical system design, as it will then form an ignitable mixture.[5]. If equipment has been approved for use in a Division 1 hazardous location, it can be used in a Division 2 hazardous location, providing it is in the same class and group.
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