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Atmosphere containing a flammable gas, a flammable liquid produced vapor or a combustible liquid-produced vapor whose MESG is greater than 0.75 mm or MIC ratio is greater than 0.40 and less than 0.80 - such as carbon monoxide, ether, hydrogen sulfide, morphline, cyclopropane, ethyl, isoprene, acetaldhyde and ethylene or gases of equivalent hazard. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. We don't save this data. An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. Please read AddThis Privacy for more information. 29 CFR 1910.307 Hazardous (classified) Locations %%EOF No representation is made that the information or references are complete or remain current. 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. 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. 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. 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. 0 In Europe and the rest of the world - but also more and more in North America - the Zone system is used. 0000002708 00000 n 0000002292 00000 n Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. 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: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. 0000022442 00000 n 29 CFR 1910.399 Definitions Applicable to Subpart S 0000013856 00000 n Comparisons between the two systems are not easily accomplished. <<03AA7842AE016145A1148916B9B14C2A>]/Prev 66330>> 10/1/20 0000000736 00000 n Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . %PDF-1.3 % If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. vo"WCH0_-3kV6[|,vQ>aHsv9W8vfa}:DtNbV$bFF3IM'CwDsV1|J@. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. hYv6SR {Jq{zh Hoo ,EI|b 87cc) bQsLy(`N$#+ueuy. PDFKit.NET 4.0.56.0 Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where. 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. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? A major safety concern in all workplaces is the occurrence of fires and explosions. Atmosphere containing flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a MESG value greater than 0.75 mm or a MIC ratio greater than 0.80 - such as gasoline, acetone, ammonia, benzene, butane, ethanol, hexane, methanol, methane, vinyl chloride, natural gas, naphtha, propane or gases of equivalent hazard. 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. Q: Are Divisions and Zones equivalent to one another? The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). 2016-02-03T14:34:30+11:00 Atmospheres containing combustible flyings. endstream endobj 8 0 obj << /MetaData 7 0 R /Title (Brand Mark AB black.eps) /Creator (Adobe Illustrator\(TM\) 7.0) /Author (Tracy Zakraysek) >> endobj 9 0 obj << /D [ 1 0 R /XYZ 391 634 null ] >> endobj 10 0 obj << /Length 3366 /Filter /FlateDecode >> stream In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). National Electric Code 2020 edition National Fire Protection Association. hb```b``6d`e` @16FF\.5qX?A ; 6Y3tzC7"N e2QPvh8(_P $I80 3%$A0el $khHD@Qik30+0rjZ"t6iRoVj:QS63.`dcG2Y= v. 0000027481 00000 n A: No. Storage Tank Water Heaters, 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. THE PRODUCTS YOU NEED, Quick Tips #124.1. 2016-02-03T14:34:30+11:00 The Zone system has three levels of hazard for gas or dust where the Division system has two. [tdc_zone type=tdc_content][vc_row][vc_column][td_block_trending_now limit=3][/vc_column][/vc_row][vc_row tdc_css=eyJhbGwiOnsiYm9yZGVyLXRvcC13aWR0aCI6IjEiLCJib3JkZXItY29sb3IiOiIjZTZlNmU2In19][vc_column width=2/3][td_block_slide sort=featured limit=3][td_block_2 border_top=no_border_top category_id= limit=6 td_ajax_filter_type=td_category_ids_filter ajax_pagination=next_prev sort=random_posts custom_title=SEA MOSS RECIPES][td_block_1 border_top=no_border_top category_id= sort=random_posts custom_title=SEA MOSS BEAUTY][td_block_ad_box spot_id=custom_ad_1][td_block_15 category_id= limit=8 sort=random_posts custom_title=SEA MOSS HEALTH BENEFITS][/vc_column][vc_column width=1/3][td_block_social_counter custom_title=STAY CONNECTED facebook=tagDiv twitter=tagdivofficial youtube=tagdiv border_top=no_border_top][td_block_9 custom_title=LIFESTYLE border_top=no_border_top category_id= ajax_pagination=next_prev sort=random_posts][td_block_ad_box spot_id=sidebar][td_block_2 sort=random_posts limit=3 category_id= custom_title=SEA MOSS BUSINESS][td_block_title][td_block_10 limit=3 custom_title= border_top=no_border_top tdc_css=eyJhbGwiOnsibWFyZ2luLXRvcCI6Ii0yMCJ9fQ==][/vc_column][/vc_row][/tdc_zone], Designed by Elegant Themes | Powered by WordPress. 0000000016 00000 n NFPA 70 NEC Classes, Divisions and Groups. 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. Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. 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. Only emails and answers are saved in our archive. %PDF-1.4 % NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. 77 0 obj <>stream 0000002756 00000 n 1994-2020, W.W. Grainger, Inc. All Rights Reserved. 0000001525 00000 n uuid:4d0a388a-8288-46f1-a45e-fec44f27584a Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. These applications will - due to browser restrictions - send data between your browser and our server. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. Electrical equipment installation in atmosphere with flammable gases or vapors, flammable liquids, combustible dusts, ignitable fibers or flyings represents a risk for fire and explosion. 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. 0000010711 00000 n %PDF-1.6 % Brand Mark AB black.eps This classification method provides a description of the hazardous material that may be present, and the probability that it is present, so that the appropriate equipment may be selected, and safe installation practices followed. 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. startxref Which system is preferred depends on the users preference, how the areas are classified, and the wiring system used. Get more great content like this sent to your inbox. Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and do so only for a short period of time. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. The Zone system has wider use in the chemical and petrochemical industries. endstream endobj 2 0 obj <> endobj 72 0 obj <> endobj 50 0 obj <> endobj 5 0 obj <> endobj 49 0 obj <>stream 56 22 AddThis use cookies for handling links to social media. WHEN YOU NEED THEM. xref The hazardous area classification system determines required protection techniques and methods for electrical installations in the location. Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. NFPA 70 NEC uses the familiar Class/Division system and has added an Americanized version of the International Electrochemical Commissions (IEC) IEC Zone system which maintains the NEC wiring methods and protection techniques. 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. Atmospheres containing non-conductive dust. A: Yes. 0000003570 00000 n Groups A, B, C, and D are for gases (Class I only). 0000011088 00000 n 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. the National Fire Protection Association (NFPA) 70, National Electric Code(NEC), Heat Stress: Not Just for Florida Anymore, Tankless Water Heaters vs. 0000002869 00000 n 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. 0000017492 00000 n The Zone Classification System is offered as an alternative to the Class and Division system. HlWWRwq[,>/2Rl9# @9&qX07-Tkw^}(5 'jY@Rc]%.QtJEH8]5mk5I;d*f?QTp&@JtO.>.O\~xC[/Oc}8-~/_>]q%o/_?MBEJ\EX'8a-RW$]k>1`kRk]~5Q2!wk7qq'rFL>;_Zq=5,GBI ?KWv w1mZu-*2lt oxW@ The Zone system is based on Article 505/506 of the National Electrical Code (NEC) and follows the international method of area classification as developed by the International Electrotechnical Commission (IEC). National Electrical Code, NFPA 70, Chapter 5, Article 500, 29 CFR 1910 Subpart S, Electrical 1910.307, NFPA 497, "Classification of Gases, Vapors, and Dusts for Electrical Equipment in Hazardous Classified Locations", NFPA Handbook, "Electrical Installations in Hazardous Locations, " by P. J. Schram and M. W. Earley, NFPA 70E, Chapter 5, "Hazardous (Classified) Locations", ANSI/UL 913, "Intrinsically Safe Apparatus", NFPA 496, "Purged and Pressurized Enclosure for Electrical Equipment in Hazardous Locations. 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! 1 0 obj << /Type /Page /Parent 16 0 R /Resources 11 0 R /Contents 10 0 R /CropBox [ 0 0 612 791 ] >> endobj 2 0 obj << /D [ 1 0 R /XYZ null null null ] >> endobj 3 0 obj << /Producer (Acrobat Distiller 5.0 \(Windows\)) /Author (dcmiller) /Title (800-WP003A-EN-P.fm) /ModDate (D:20011025083838-04'00') /CreationDate (D:20010717151335Z) /Creator (FrameMaker 6.0) >> endobj 5 0 obj << /D [ 1 0 R /XYZ null null null ] >> endobj 6 0 obj << /D [ 1 0 R /XYZ 279 529 null ] >> endobj 7 0 obj << /Length 839 >> stream 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. Electrical equipment can and does cause fires and/or explosions in certain atmospheres. 0000014233 00000 n Group defines the type of the hazardous material in the surrounding atmosphere. 0000010191 00000 n Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). Group is divided in three groups where Group I is reserved for mining locations. application/pdf Sources SIGN UP FOR EMAILGet more great content in your inbox. Cookies are only used in the browser to improve user experience. Groups E, F, and G are for dusts and flyings (Class II or III). No other aspect of safety receives more attention in the form of codes and standards. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Google use cookies for serving our ads and handling visitor statistics. Class defines the type of explosive or ignitable substances which are present in the atmosphere. trailer The Occupational Safety and Health Administration (OSHA) has adopted these hazardous classifications and all except Groups are defined in 29 Code of Federal Register (CFR) 1910.399. tP ZMyV&V+Q^TIwJU|.u"v@w5S"C4JjI3;kF FEvGv=bz2@XbtvijbJw4'E 0000001200 00000 n 0000013400 00000 n 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. You can target the Engineering ToolBox by using AdWords Managed Placements. 2016-02-03T14:34:30+11:00 0000003168 00000 n Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 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. These areas are in North America (United States and Canada) historically classified with the Class/Division system. 0000001119 00000 n ". Some of our calculators and applications let you save application data to your local computer. We don't collect information from our users. Zones compares to classes and divisions in the Class/Division system. 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. 0000001679 00000 n Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. The specific hazardous materials within each group and their automatic ignition temperatures can be found in Article 500 of the National Electrical Code and in NFPA 497. Readers with specific questions should refer to the applicable standards or consult with an attorney. uuid:db5608e1-21e6-48a5-a3ca-1bedb57e5c09 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. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. 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. 0000022975 00000 n These areas are classified solely for the purpose of ensuring the safe and proper specification and installation of electrical/electronic equipment. 1 0 obj <> endobj 104 0 obj <>stream A room with a propane gas installation will typically be classified with the. 56 0 obj <> endobj Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. Division defines the probability of the hazardous material being present in an ignitable concentration in the surrounding atmosphere.

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