Group is divided in three groups where Group I is reserved for mining locations. 0 0000013400 00000 n endstream endobj 2 0 obj <> endobj 72 0 obj <> endobj 50 0 obj <> endobj 5 0 obj <> endobj 49 0 obj <>stream These areas are in North America (United States and Canada) historically classified with the Class/Division system. SIGN UP FOR EMAILGet more great content in your inbox. tP ZMyV&V+Q^TIwJU|.u"v@w5S"C4JjI3;kF FEvGv=bz2@XbtvijbJw4'E In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. 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. A: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. Q: Are Divisions and Zones equivalent to one another? %%EOF We don't collect information from our users. [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. Some of our calculators and applications let you save application data to your local computer. 2016-02-03T14:34:30+11:00 Get more great content like this sent to your inbox. No other aspect of safety receives more attention in the form of codes and standards. 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 A major safety concern in all workplaces is the occurrence of fires and explosions. 0000001525 00000 n 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. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. 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. 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. Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. Google use cookies for serving our ads and handling visitor statistics. 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. 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. Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . 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@ 0000000016 00000 n hb```b``6d`e` @16FF\.5qX?A ; 6Y3tzC7"N e2QPvh8(_P $I80 3%$A0el $khHD@Qik30+0rjZ"t6iRoVj:QS63.`dcG2Y= v. 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! National Electric Code 2020 edition National Fire Protection Association. 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. 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). 0000002756 00000 n 10/1/20
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. 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. WHEN YOU NEED THEM.
It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. Class defines the type of explosive or ignitable substances which are present in the atmosphere. 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. 0000001119 00000 n Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. Group defines the type of the hazardous material in the surrounding atmosphere. 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. Atmospheres containing non-conductive dust. These applications will - due to browser restrictions - send data between your browser and our server. Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. 0000013856 00000 n Groups E, F, and G are for dusts and flyings (Class II or III). 0000003168 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. 0000010191 00000 n Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? <<03AA7842AE016145A1148916B9B14C2A>]/Prev 66330>> Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? Readers with specific questions should refer to the applicable standards or consult with an attorney. 0000017492 00000 n 2016-02-03T14:34:30+11:00 Cookies are only used in the browser to improve user experience. In Europe and the rest of the world - but also more and more in North America - the Zone system is used. Sources Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! These areas are classified solely for the purpose of ensuring the safe and proper specification and installation of electrical/electronic equipment.
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