>> For Gas/Vapor this would be Zone 2. Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. . 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". 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. Equipment meeting one or more of the protection techniques described in paragraph (g)(3) of this section shall be marked with the following in the order shown: Class, except for intrinsically safe apparatus; Zone, except for intrinsically safe apparatus; Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. In other cases, the atmosphere is normally non-hazardous, but a dangerous concentration can be reasonably foreseensuch as operator error or equipment failure. 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. This concentration is substance specific and lies normally somewhere between the LEL and UEL. Division defines the likelihood of the hazardous material being present in an explosive or ignitable concentration.Class I flammable gases and vapors are grouped into one of four groups(Groups A, B, C or D)based on their physical properties and the ease in which they can be ignited. Category 2 equipment may be used in zone 1 or zone 2 areas. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. SIGN UP FOR EMAILGet more great content in your inbox. 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. eg Production Area, area surrounding zone 0. June 2019 This leads to a lot of the confusion in the global marketplace because certifying equipment to these different systems can be time consuming and expensive, so many companies may only certify to one or the other. Feedback From Clients The required protection level is linked to the intended use in the zones described below: The equipment category indicates the level of protection offered by the equipment. gas, vapours, mists and dusts). 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. Enclosures can be pressurized with clean air or inert gas, displacing any hazardous substance. NFPA 70, the National Electrical Code (NEC), defines area classification and installation principles. may exist under normal or abnormal conditions because of the presence of flammable gases or vapors, combustible dusts or ignitable fibers or flyings. [3], Different explosive atmospheres have chemical properties that affect the likelihood and severity of an explosion. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? Class I, Zone 0 or Zone 1 locations may not abut Class I, Division 1 or Division 2 locations. 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". Copryright 2023 Springer Controls Company . 5: For further information on ventilation, see NFPA 30-2018, Informational Note No. 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. The colour of the luminaire body indicates the level of protection. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. 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. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. Although OSHA does not provide a definition of group classifications in 29 CFR 1910.307 or 399 they do provide a note under 29 CFR 1910.307(c)(1) that states: NFPA 70, the National Electrical Code, lists or defines hazardous gases, vapors, and dusts by Groups characterized by their ignitable or combustible properties. To meet OSHAs marking requirement, the marking must include the hazardous group the equipment is approved to operate in. In this article 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. Zone 0Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. The flash-point is the temperature at which the material will generate sufficient quantity of vapor to form an ignitable mixture. Cookies are only used in the browser to improve user experience. Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. Zone Hazardous Location 2 Table of . The temperature marking may not exceed the ignition temperature of the specific gas or vapor to be encountered. Temperature Control But beside electrical equipment also mechanical equipment must be Ex certified, e.g. The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. Non-hazardous or ordinary locations. These areas only become hazardous in case of an accident or some unusual operating condition. >> NEC: Class II, Division 1, Group F. | IEC: Zone 20, Group IIC. In recent years also the EPL is specified for several kinds of protection. A material may have a relatively low autoignition temperature yet if its flash-point is above the ambient temperature, then the area may not need to be classified. Sources 2: This classification includes, Informational Note No. NFPA 70 NEC Classes, Divisions and Groups. 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. NEW METHODS FOR HAZARDOUS AREA CLASSIFICATION FOR EXPLOSIVE GAS . March 2021 Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. There are four zones in the IEC classification system: Zone 0: An area in which an explosive atmosphere is present continuously or for long periods. Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. In the United States, the NEC uses 2 different classifications: Upon detection, appropriate action is automatically taken, such as removing power, or providing notification. In Europe the ATEX 114 Directive (2014/34/EU) is applicable to equipment that is used in hazardous area's. Dust or other small particles suspended in air can explode. 7: For further information on application of electrical, Informational Note No. Hazardous area classification. 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. Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 September 2019. Classification of locations, testing and listing of equipment, and inspection of installation, is typically overseen by governmental bodies. I Flammable gases or vapors may be present, 1 Ignitable concentrations of hazards exist under normal operation conditions and/or where the hazard is caused by frequent maintenance or repair work or frequent equipment failure, E Combustible metal dusts: aluminum, commercial alloys and magnesium, III Easily ignitable fibers or flyings may be present, 0 Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time, 1 Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions; may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that equipment breakdown/faulty operations could result in the release of ignitable concentrations of flammable gases or vapors and failure of the equipment, 2 Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and if they do will only persist for a short period of time; or volatile flammable liquids, gases, or vapors are confined within closed containers/systems and can escape only as a result of an accidental rupture; or volatile flammable liquids, gases, or vapors are normally prevented by positive mechanical ventilation, but may become hazardous due to system failure, 20 Combustible dusts or ignitable fibers/flyings are present continuously or for long periods of time, 21 Combustible dusts or ignitable fibers/flyings are likely to occur under normal operating conditions; or may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that breakdown/faulty operations could result in the release of ignitable concentrations of combustible dust or fibers/flyings and failure of the equipment, 22 Combustible dusts or ignitable fibers/flyings are likely to occur under normal operating conditions; or may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that breakdown/faulty operations could result in the release of ignitable concentrations of combustible dust or fibers/flyings and failure of the equipment, Mines susceptible to firedamp (flammable mixture of gases naturally occurring in a mine, Explosive dusts Group III equipment is subdivided into three subgroups, A Atmospheres containing acetone, ammonia, ethyl alcohol, gasoline, methane, propane, or gases/vapors of equivalent hazard, A Atmospheres containing solid particles and fibers greater than 500 microns that could be suspended in air and settle out, B Atmospheres containing acetaldehyde, ethylene, or gases / vapors of equivalent hazard, B Atmospheres containing combustible dusts other than combustible metal dusts, C Atmospheres containing acetylene, hydrogen, or gases/vapors of equivalent hazard, C Atmospheres containing combustible metal dusts. Area which are not devided into Atex zones, are called non-hazardous area's. Class / Division System In Northerm America, instead of the zone classification system, the Class/Division system is used. Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. You will find these zones at the manifold of a tank truck or the interior of a silo. Hazardous Area Classification is a study, in which is assessed, at witch locations of a plant, factory or company, high concentrations of flammable gases are present or can be released, in order to create an explosion hazard. It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . No representation is made that the information or references are complete or remain current. Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures.
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