This was accompanied by electrically-initiated explosions of flammable gas such as fire damp (methane) and suspended coal dust. Zone 2. gas, vapours, mists and dusts). If equipment is marked, for example, Ex e II T4 then it is suitable for all subgroups IIA, IIB and IIC. . The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. Equipment is placed into protection level categories according to manufacture method and suitability for different situations. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Comparison of Zones and Divisions. IECEx Karandikar Certification Class defines the type of explosive or ignitable substances which are present in the atmosphere. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). We don't collect information from our users. Equipment marked as suitable for IIB is also suitable for IIA but NOT for IIC. Zone 1 Definition (ATEX). What is a Zone 1 hazardous area? - Pyroban Hazardous Area Classifications: What You Need to Know Note to paragraph (g)(5)(ii)(B) of this section: An example of such a required marking is "Class I, Zone 0, AEx ia IIC T6." August 2021 The IEC standard EN 60079-33 is made public and is expected to become effective soon, so that the normal Ex certification will also be possible for Ex-s, Zone depending upon manufacturer's certification, explosive atmosphere between 10 and 1000 hrs/yr, explosive atmosphere between 1 and 10 hrs/yr, explosive surface between 10 and 1000 hrs/yr, explosive surface between 1 and 10 hrs/yr, Certified and labeled for use in indoor locations rated NEC Class I, Groups A, B, C, and D, Certified and labeled for use in locations rated NEC Class I, Groups A, B, C, and D; both indoors and outdoors, Certified and labeled for use in locations rated NEC Class II, Groups E, F, or G, Explosion protected, Group 2, Category 1, Gas, Type ia, Group 2C gases, Temperature class 4, Type n, non-sparking, Group 2 gases, Temperature class 3, special conditions apply. ADNOC For explosion hazards caused by flammable liquids or gases, the following zones are defined: So a zone 0 is the most hazardous zone and a zone 2 is a less hazardous zone. 2: This classification includes, Informational Note No. So yes, it is important to choose the right model and always wonder what am I assessing?. You can target the Engineering ToolBox by using AdWords Managed Placements. Several protection strategies exist. Coal mines, grain mills, elevators, and similar facilities likewise present the risk of a clouds of dust. An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. * Zone 2 a . Hazardous Environment Classifications: NEC vs IEC, IEC (International Electrotechnical Commission), Group E Metal dusts (eg. 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. Whenever you are filling up your tank you are standing in a Zone 1 hazardous area. December 2013, All Zones compares to classes and divisions in the Class/Division system. Standards for electrical installations have been established and are governed by a variety of organizations throughout the world to ensure safe electrical systems in hazardous locations. Copryright 2023 Springer Controls Company . No. Sources of 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. The American Petroleum Institute publishes analogous standards in RP500 andRP505. Where there is potential for an explosive atmosphere, special precautions are needed to prevent fires and explosions. Dn 2 - a Ce d e r . 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 . of the autoignition temperature of the hazardous atmosphere. That flammable gas or vapor . A potential few examples of this are: The air space inside a tank of petrol LIFTING TEST August 2018 What is an Explosion Protection Document? Arcing electrical equipment in unclassified . Sources Zone 1 fittings are supplied as silver, Zone 2 as dark grey and industrial fittings as white. Hazardous Areas Classification | Switches International Pty (Ltd) hazardous areas as the following: An area where a potential hazard (e.g., a fire, an explosion, etc.) The temperature marking may not exceed the ignition temperature of the specific gas or vapor to be encountered. IEC 60079-10-1 covers classification of explosive gas atmospheres, and IEC 60079-10-2 explosive dust. FREEZER 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. 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). Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. Zones. Substance properties are specific for the amount of fuel needed to get an explosion when all other conditions are met. Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: Zone 0: An area in which an. For liquids, gases and vapours: Zone 0, Zone 1 and Zone 2. 1910.307 - Hazardous (classified) locations. | Occupational Safety and Figures show that appr. 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. 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. In 29 CFR 1910.307(c)(2)(ii), OSHA requires all equipment used in a hazardous location to be marked with the class, group and operating temperature or temperature range for which it is approved. Hazardous Areas - European Classification Standard - Engineering ToolBox The Hazardous Area Classification presents in this guide is based on the following items as reference: API: API RP 505 Recommended Practice for Classification of Locations for Electrical. POSITIVE PRESSURE NFPA 70 NEC Classes, Divisions and Groups. A room with a propane gas installation will typically be classified with the. No long-term contract. * Zone 1 a location in which explosive gas atmospheres are likely to occur during normal operation, or which is adjacent to a Zone 0 location. NFPA 70 NEC Articles 500 through 503 cover the requirements for electrical/electronic equipment and wiring for all voltages in Class I, Divisions 1 and 2; Class II, Divisions 1 and 2; and Class III, Divisions 1 and 2 locations. These areas only become hazardous in case of an accident or some unusual operating condition. These generally give rise to areas classied as Zones 0, 1, and 2 respectively. This is presented by the Lower Explosion Limit (LEL) of a substance. Documentation requirements likewise vary. Canada has a similar system with CSA Group standard C22.1, the Canadian Electrical Code, which defines area classification and installation principles. Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. A major safety concern in all workplaces is the occurrence of fires and explosions. 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. Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. When the concentration of gas or vapor is above the UEL the gas mixture is too rich to burn. Atmospheres containing non-conductive dust. SEWAGE TREATMENT July 2019 However, at low ambient temperatures, flammable concentrations of vapors may not exist in a location classified Class I, Zone 0, 1, or 2 at normal ambient temperature. In instances of areas within the same facility classified separately, Class I, Zone 2 locations may abut, but not overlap, Class I, Division 2 locations. Category 1 equipment may be used in zone 0, zone 1 or zone 2 areas. Zone Hazardous Location 2 Table of . But when we take a closer look at the graph and table, we can conclude that any explosion, can easily lead to severe damage. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). of | For Dust this would be Zone 21. In many industrial, commercial, and scientific settings, the presence of such an atmosphere is a common, or at least commonly possible, occurrence. 9: For additional information concerning the installation of, Informational Note No. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. Zone 2 hazardous areas are typically storage areas but can also be process areas. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. Zone 1 - Explosive atmospheres are likely to occur. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. There are two systems in place, including the traditional North American Division system as well as the alternative Zone system. Class 1/Div 2 ATEX Zone 2 Computers. June 2020 A high level of protection is ensured. Comments. We will go deeper into ignition assessments in another blog. The simplest is to minimize the amount of electrical equipment installed in a hazardous location, either by keeping the equipment out of the area altogether, or by making the area less hazardous (for example, by process changes, or ventilation with clean air). . Pressurised Container Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 7, Safety Systems, Hazardous Areas and Fire, June 2013, Lloyd's Register, Global Standards. taper per foot. WELDING INSPECTION In other cases, the atmosphere is normally non-hazardous, but a dangerous concentration can be reasonably foreseensuch as operator error or equipment failure. These would be then labeled with each of the individual methods. This is also one of the first steps when composing an Explosion Protection Document. 0,1 or 2: II B: I: 1 or 2: C: Acetone Benzene Butane Hexane . Flammable atmosphere expected to be present inside the storage tank continuously, hence it has been classified as zone 0. Zone 2: An area in which an explosive atmosphere is not likely to occur in normal operation, but if it does . The use of EPL and ATEX Category directly is an alternative for "s" marking. Informational Note No. It is essential to know which zone you are working in, so that you can specify the most appropriate equipment. Offshore Workshop Container This article covers the requirements for the, Informational Note No. Classification of locations, testing and listing of equipment, and inspection of installation, is typically overseen by governmental bodies. June 2019 See below for further details: Division system sample marking 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. A light switch may cause a small, harmless spark when switched on or off. Dust or other small particles suspended in air can explode. - 1 2 (Class 1, . 3: For further information on the classification of, Informational Note No. October 2021 29 CFR 1910.307 Hazardous (classified) Locations Understanding Class, Divisions, Groups and Zones - Larson Electronics In the United States, the NEC uses 2 different classifications: 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. 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. Zone 1 if gas group & temp. 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. Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. But first, we must consider what is likely to cause an explosion in the first place. Zone 1 (unless separated by a fire wall)P.G.Sreejith, Kerala. Type of protection "n" is further subdivided into nA, nC, and nR. The process of determining the type and size of hazardous locations is called classification. The term equipment is applied both for fixed equipment and mobile equipment that are operated in such area. 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. Accommodation Cabin 4: For further information on protection against static electricity and lightning hazards in hazardous (classified). Temporary Refuge (TR) Shelter All emergency versions, whether Zone 1 or Zone 2 can also be easily visually identified by their red end cap, encapsulating the emergency battery back-up. October 2018 In electrical and safety engineering hazardous locations HazLoc pronounced hazlk are places where fire or explosion hazards may exist. August 2022 ), Group F Carbon-based (eg. For methane this is shown in the following figure. An old British standard used letters to designate zones. The first thing to understand is that much like the metric vs imperial measuring systems, the United States uses its own methodology which differs from much of the world. Ambient Temperature (-20C to +40C if not marked) Establish Zone Based on "IEC 60079-10". 10: For information on electrical resistance trace heating for hazardous (classified), Informational Note No. Horizontal. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). Is intended for us in Zone 2 (gases) or Zone 22 (dusts). >> For Gas/Vapor this would be Zone 2. HAZARDOUS AREA HAZARDOUS AREA CLASSIFICATIONS - Academia.edu Zone defines the general nature - if it is a gas or dust - and the probability of hazardous material being present in an ignitable concentration in the surrounding atmosphere. The last condition for an explosion is the presence of an effective ignition source in the direct contact with the fuel/air mixture. Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. Equipment that is listed for a Zone 1 location may be installed in a Zone 2 location of the same gas or vapor. Beside the Lower Explosion Limit, each substance also has an Upper Explosion Limit (UEL). In some cases, the hazardous atmosphere is present all the time, or for long periods. Intrinsic safety designs equipment to operate using minimal energy, insufficient to cause ignition. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? A Zone 1 hazardous area is classified as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. the inside of tank truck or the interior of a dust filter). The above groups are formed in order of how explosive the material would be if it was ignited, with IIC being the most explosive zone system gas group and IIA being the least. Q: Are Divisions and Zones equivalent to one another? RP 505 is referred to as the zone system. WATER TIGHTNESS February 2019 Zones also have the added benefit of including the area classification with the zone description. 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. 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. 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). As a guide for Zone 0, this can be defined as over 1000 hours/year or >10% of the time. Youre phone isnt rated for use in hazardous areas. 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. 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. The lower explosion limit of a substance is the lowest concentration (in volume percentages for gases and liquids) of a gas or a vapor in air of producing a flash of fire in the presence of an ignition source. Methane has a UEL of 17 vol%, which means when the concentration of methane in air is above the 17 vol% an explosion cannot occur even when an ignition source is present. a headlamp, rather than a dedicated fixed luminaire. Feedback From Clients Those guidelines address electric wiring, equipment, and systems installed in hazardous (classified) locations and contain specific provisions for the following: wiring methods, wiring connections; conductor insulation, flexible cords, sealing and drainage, transformers, capacitors, switches, circuit breakers, fuses, motor controllers, receptacles, attachment plugs, meters, relays, instruments, resistors, generators, motors, lighting fixtures, storage battery charging equipment, electric cranes, electric hoists and similar equipment, utilization equipment, signaling systems, alarm systems, remote control systems, local loud speaker and communication systems, ventilation piping, live parts, lightning surge protection, and grounding. The Regulations define 3 zones that can exist within a hazardous area: Zone 0 - A place in which an explosive atmosphere is present continuously or for long periods. 1910.307 (g) (2) 1) MESG (Maximum Experimental Safe Gap) - The maximum clearance between two parallel metal surfaces that has been found under specified test conditions to prevent an explosion in a test chamber from being propagated to a secondary chamber containing the same gas or vapor at the same concentration. >> For Gas Vapor this would be Zone 1. The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. 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. Class II, Div 2 Class III, Div 1 nR 3G Zone 2 Gc Class III, Div 2 Pressurised Room px 60079-13 2G Zone 1 Gb Zone 21 Db 2D Pressurised Room FM3611 NFPA 496 Class I, Div 1 Class I, Div 2 Class II, Div 1 Class II, Div 2 py 2G Zone 1 Gb pz 3G Zone 2 Gc Zone 22 Dc 3D pv Non-hazardous Gb/GC Optical Radiation op sh 60079-28 1G Zone 0 Ga Zone 20 Da 1D . PDF Australian Hazardous Area Selection Chart - Frsa NFPA 70 NEC Articles 505 and 506 cover the requirements for the Americanized Zone classification system as an alternative to the Class and Division classification system. 1: As a guide in determining when flammable gases or vapors are present continuously or for long periods of time, refer to ANSI/API RP 505-2018, Informational Note No. PDF Product Bulletin Hazardous Area Classifications September 2019 These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. The Zone Classification System is offered as an alternative to the Class and Division system. The NEMA enclosure rating or IP code may also be indicated, but it is usually independent of the Classified Area suitability. Ex Zone - What is an Ex Zone? - Atexor Knowledge Base In the US, the independent National Fire Protection Association (NFPA) publishes several relevant standards, and they are often adopted by government agencies. See Figure S-1 for an explanation of this marking. Some other standards have more quantitative methods which require more knowledge of the plant, an example is the IEC standard 60079-10-1. 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. Raytec do not currently offer any lighting solutions for Zone 0. 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

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