electric motor hazardous area classification chart

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 Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. 0000000736 00000 n Quick Tips #124.1. 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 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). An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions.

National Electric Code 2020 edition National Fire Protection Association. 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. 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. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Brand Mark AB black.eps 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. The hazardous area classification system determines required protection techniques and methods for electrical installations in the location. 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. 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. Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. 0000013400 00000 n 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! hYv6SR {Jq{zh Hoo ,EI|b 87cc) bQsLy(`N$#+ueuy. 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. tP ZMyV&V+Q^TIwJU|.u"v@w5S"C4JjI3;kF FEvGv=bz2@XbtvijbJw4'E Group defines the type of the hazardous material in the surrounding atmosphere. ". 0000001525 00000 n Atmospheres containing non-conductive dust. 0000022442 00000 n Some of our calculators and applications let you save application data to your local computer. 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. 10/1/20

Only emails and answers are saved in our archive. 2016-02-03T14:34:30+11:00 THE PRODUCTS YOU NEED, 0000001679 00000 n A: Yes. Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. Get more great content like this sent to your inbox. 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 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 . Group is divided in three groups where Group I is reserved for mining locations. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). 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@ SIGN UP FOR EMAILGet more great content in your inbox. Comparisons between the two systems are not easily accomplished. Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. 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. %PDF-1.6 % The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where.

Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. A: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. 56 22 No representation is made that the information or references are complete or remain current. 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.

The Zone Classification System is offered as an alternative to the Class and Division system. 0000002756 00000 n 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. 0000002869 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. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. A room with a propane gas installation will typically be classified with the. 0000022975 00000 n vo"WCH0_-3kV6[|,vQ>aHsv9W8vfa}:DtNbV$bFF3IM'CwDsV1|J@. 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. 0000014233 00000 n No other aspect of safety receives more attention in the form of codes and standards. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? Please read AddThis Privacy for more information. A major safety concern in all workplaces is the occurrence of fires and explosions. 56 0 obj <> endobj 1994-2020, W.W. Grainger, Inc. All Rights Reserved. The Zone system has three levels of hazard for gas or dust where the Division system has two. These applications will - due to browser restrictions - send data between your browser and our server. Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. 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. 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. 0000001200 00000 n 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. 0000017492 00000 n hb```b``6d`e` @16FF\.5qX?A ; 6Y3tzC7"N e2QPvh8(_P $I80 3%$A0el $khHD@Qik30+0rjZ"t6iRoVj:QS63.`dcG2Y= v. 0000011088 00000 n

Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). 0000000016 00000 n 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. 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. Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. 0000003168 00000 n PDFKit.NET 4.0.56.0 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. <<03AA7842AE016145A1148916B9B14C2A>]/Prev 66330>> 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. Google use cookies for serving our ads and handling visitor statistics. uuid:db5608e1-21e6-48a5-a3ca-1bedb57e5c09 Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. application/pdf We don't save this data. uuid:4d0a388a-8288-46f1-a45e-fec44f27584a The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. endstream endobj 2 0 obj <> endobj 72 0 obj <> endobj 50 0 obj <> endobj 5 0 obj <> endobj 49 0 obj <>stream 0000001119 00000 n Cookies are only used in the browser to improve user experience. 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. 0000003570 00000 n Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. %%EOF 2016-02-03T14:34:30+11:00 the National Fire Protection Association (NFPA) 70, National Electric Code(NEC), Heat Stress: Not Just for Florida Anymore, Tankless Water Heaters vs.

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