Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? 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. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. 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! 0000011088 00000 n 56 0 obj <> endobj Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. hb```b``6d`e` @16FF\.5qX?A ; 6Y3tzC7"N e2QPvh8(_P $I80 3%$A0el $khHD@Qik30+0rjZ"t6iRoVj:QS63.`dcG2Y= v. AddThis use cookies for handling links to social media. Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. SIGN UP FOR EMAILGet more great content in your inbox. <<03AA7842AE016145A1148916B9B14C2A>]/Prev 66330>> An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. application/pdf Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. xref 0000001119 00000 n Division defines the probability of the hazardous material being present in an ignitable concentration in the surrounding atmosphere. Atmospheres containing non-conductive dust. 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. 0000000736 00000 n 0000002756 00000 n 0000001200 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. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. 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. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. 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. 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. 0000003168 00000 n 0000010191 00000 n 0000014233 00000 n 0000000016 00000 n 10/1/20 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. tP ZMyV&V+Q^TIwJU|.u"v@w5S"C4JjI3;kF FEvGv=bz2@XbtvijbJw4'E the National Fire Protection Association (NFPA) 70, National Electric Code(NEC), Heat Stress: Not Just for Florida Anymore, Tankless Water Heaters vs. 0000002708 00000 n The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where. Which system is preferred depends on the users preference, how the areas are classified, and the wiring system used. Some of our calculators and applications let you save application data to your local computer. The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. 0000003570 00000 n Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. 56 22 Readers with specific questions should refer to the applicable standards or consult with an attorney. 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. 0000022975 00000 n 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. 77 0 obj <>stream THE PRODUCTS YOU NEED, Get more great content like this sent to your inbox. 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Q: Are Divisions and Zones equivalent to one another? 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 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. 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. 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. 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. A: Yes. %PDF-1.3 % uuid:4d0a388a-8288-46f1-a45e-fec44f27584a 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. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). 2016-02-03T14:34:30+11:00 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. 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. hYv6SR {Jq{zh Hoo ,EI|b 87cc) bQsLy(`N$#+ueuy. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). National Electric Code 2020 edition National Fire Protection Association. Brand Mark AB black.eps Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. These applications will - due to browser restrictions - send data between your browser and our server. The specific hazardous materials within each group and their automatic ignition temperatures can be found in Article 500 of the National Electrical Code and in NFPA 497. WHEN YOU NEED THEM. 2016-02-03T14:34:30+11:00 Please read AddThis Privacy for more information. 0000002869 00000 n %PDF-1.6 % PDFKit.NET 4.0.56.0 No other aspect of safety receives more attention in the form of codes and standards. HlWWRwq[,>/2Rl9# @9&qX07-Tkw^}(5 'jY@Rc]%.QtJEH8]5mk5I;d*f?QTp&@JtO.>.O\~xC[/Oc}8-~/_>]q%o/_?MBEJ\EX'8a-RW$]k>1`kRk]~5Q2!wk7qq'rFL>;_Zq=5,GBI ?KWv w1mZu-*2lt oxW@ Electrical equipment can and does cause fires and/or explosions in certain atmospheres. NFPA 70 NEC Classes, Divisions and Groups. 2016-02-03T14:34:30+11:00 0 0000010711 00000 n endstream endobj 2 0 obj <> endobj 72 0 obj <> endobj 50 0 obj <> endobj 5 0 obj <> endobj 49 0 obj <>stream NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. No representation is made that the information or references are complete or remain current. Zones compares to classes and divisions in the Class/Division system. 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. Groups A, B, C, and D are for gases (Class I only). Group is divided in three groups where Group I is reserved for mining locations. 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 Sources The Zone system has three levels of hazard for gas or dust where the Division system has two. 29 CFR 1910.399 Definitions Applicable to Subpart S 0000022442 00000 n 0000001679 00000 n 0000013400 00000 n Only emails and answers are saved in our archive. 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. In Europe and the rest of the world - but also more and more in North America - the Zone system is used. 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. trailer These areas are in North America (United States and Canada) historically classified with the Class/Division system. 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. 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 Zone system has wider use in the chemical and petrochemical industries. Group defines the type of the hazardous material in the surrounding atmosphere. We don't save this data. 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. 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. We don't collect information from our users. 0000017492 00000 n %PDF-1.4 % 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. Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . 29 CFR 1910.307 Hazardous (classified) Locations Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. 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. Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. 0000001525 00000 n 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. Atmospheres containing combustible flyings. 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). Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. A: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. A major safety concern in all workplaces is the occurrence of fires and explosions. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Cookies are only used in the browser to improve user experience. uuid:db5608e1-21e6-48a5-a3ca-1bedb57e5c09 startxref Groups E, F, and G are for dusts and flyings (Class II or III). ". A room with a propane gas installation will typically be classified with the. You can target the Engineering ToolBox by using AdWords Managed Placements. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. 0000013856 00000 n A: No. These areas are classified solely for the purpose of ensuring the safe and proper specification and installation of electrical/electronic equipment. Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. 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. 1994-2020, W.W. Grainger, Inc. All Rights Reserved. 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. The hazardous area classification system determines required protection techniques and methods for electrical installations in the location. 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. 0000027481 00000 n 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. Quick Tips #124.1. The Zone Classification System is offered as an alternative to the Class and Division system. %%EOF 0000002292 00000 n 1 0 obj <> endobj 104 0 obj <>stream 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. Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. Comparisons between the two systems are not easily accomplished. vo"WCH0_-3kV6[|,vQ>aHsv9W8vfa}:DtNbV$bFF3IM'CwDsV1|J@.
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