It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . Equipment in this category is intended for use in areas in which explosive atmospheres caused by gases, vapours, mists or air/dust mixtures are likely to occur occasionally. [1] NEC article 500 describes the NEC Division classification system, while articles 505 and 506 describe the NEC Zone classification system. of 1: As a guide to classification of Zone 22 locations, refer to ANSI/ISA 60079-10-2 (12.10.05)-2013, Explosive Atmospheres Part 10-2: Classification of areas Combustible dust atmospheres. Zone 0: flammable atmosphere highly likely to be present - may be present for long periods or even continuously . 41 gas explosions per year occur within the UK and app. November 2021 July 2019 ". NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). No hidden fees. Some other standards have more quantitative methods which require more knowledge of the plant, an example is the IEC standard 60079-10-1. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). There are three zones for gas: Zone 0, Zone 1 and Zone 2. In general, all types of equipment installed within the hazardous area shall be . Type of protection "n" -- This protection technique is permitted for equipment in the Class I, Zone 2 locations for which it is approved. with hazardous areas EC-Type Examination Certificate BAS 01 ATEX 7251 , for additional certificates see www.pepperl-fuchs.com Group, category, type of protection II (1) G D [EEx ia] IIB (-20 C Ta 60 C) [circuit(s) in zone 0/1/2] Output EEx ia IIB Voltage U0 25.9 V Current I0 184 mA Power P0 1.2 W Type of protection [EEx ia] . ethanol, methane or hydrogen. Safe for the hazardous (classified) location. Equipment shall be approved not only for the class of location, but also for the ignitable or combustible properties of the specific gas, vapor, dust, or fiber that will be present. Magnesium, Titanium), IIB Nonconductive dusts (eg. The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. Where pyrophoric materials are the only materials used or handled, these locations need not be classified. Offshore Workshop Container Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? Have a think about it next time youre filling up! Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. Gas a. The four steps involved in hazardous area classification are: Determine the type of hazard or "class" that might be presentcombustible gas (Class I), combustible dust (Class II), or fibers (Class III). Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. It may exist because of repair, maintenance operations, or leakage. The value is represented is volume percentage of oxygen. Hazardous Area Classification, Gas Vapours and Dust Groups, Temperature Class | Simple Science Simple Science 8.81K subscribers Join Subscribe 28K views 2 years ago This video explains. Explosion Hazardous Areas are divided into zones according to risk probabilities. Therefor Hazardous Area Classification (HAC) is the first important step in achieving an explosion safe installation or work environment. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . Pressurised Container 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. Equipment is pressurised to a positive pressure relative to the surrounding atmosphere with air or an inert gas, thus the surrounding ignitable atmosphere can not come in contact with energized parts of the apparatus. 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. Comparison of Zone 2 and Division 2 TABLE 1 - AREA CLASSIFICATIONS Division 1: Where ignitable concentrations can exist all of the time or some . The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. Other ignition sources can also be present, like static electricity. You will find this equipment in paint factories, a warehouse or around a bag dump station. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. Equipment construction is such that it can withstand an internal explosion and provide relief of the external pressure via flamegap(s) such as the labyrinth created by threaded fittings or machined flanges. Classification of Hazardous Areas 0 100 200 300 400 500 600 T1 >450C T2 >300C 450C T3 >200C 300C T4 >135C 200C . This rapid expansion of volume is caused by the combustion of a fuel, like e.g. Class I, Zone 0 or Zone 1 locations may not abut Class I, Division 1 or Division 2 locations. 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 above groups are formed in order of how explosive the material would be if it was ignited, with IIC being the most explosive zone system gas group and IIA being the least. That is why the use of mobile phones on petrol forecourts are banned. The autoignition temperature is the lowest temperature at which the substance will ignite without an additional heat or ignition source (at atmospheric pressure). Zones. In other cases, the atmosphere is normally non-hazardous, but a dangerous concentration can be reasonably foreseensuch as operator error or equipment failure. December 2021 For example, in the US by the Occupational Safety and Health Administration. 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. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). In Northerm America, instead of the zone classification system, the Class/Division system is used. | For Gas/Vapor this would be Zone 0. (Hazardous Area Classification) . Class I Zone 2 Hazardous Areas. Raytec do not currently offer any lighting solutions for Zone 0. THE CURRENT STANDARD . Q: Are Divisions and Zones equivalent to one another? A Zone 1 hazardous area is classified as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. 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. There are several ways of how to perform hazardous area classification, all described in several standards or codes of practise. Powder Filling "q" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. No other aspect of safety receives more attention in the form of codes and standards. Flammable liquids with a high flash point are less hazardous than liquids Industrial electrical equipment for hazardous area has to conform to appropriate parts of standard: IEC-60079 for gas hazards, and IEC-61241 for dust hazards. In North America the suitability of equipment for the specific hazardous area must be tested by a Nationally Recognized Testing Laboratory, such as UL, FM Global, CSA Group, or Intertek (ETL). September 2020 The lower explosion limit of a substance is the lowest concentration (in volume percentages for gases and liquids) of a gas or a vapor in air of producing a flash of fire in the presence of an ignition source. The IEC standard EN 60079-33 is made public and is expected to become effective soon, so that the normal Ex certification will also be possible for Ex-s, Zone depending upon manufacturer's certification, explosive atmosphere between 10 and 1000 hrs/yr, explosive atmosphere between 1 and 10 hrs/yr, explosive surface between 10 and 1000 hrs/yr, explosive surface between 1 and 10 hrs/yr, Certified and labeled for use in indoor locations rated NEC Class I, Groups A, B, C, and D, Certified and labeled for use in locations rated NEC Class I, Groups A, B, C, and D; both indoors and outdoors, Certified and labeled for use in locations rated NEC Class II, Groups E, F, or G, Explosion protected, Group 2, Category 1, Gas, Type ia, Group 2C gases, Temperature class 4, Type n, non-sparking, Group 2 gases, Temperature class 3, special conditions apply. Area Classification. IECEx Karandikar Certification 0. Area ClassificationThe max surface temp. July 2021 . Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. The surface of a high pressure steam pipe may be above the autoignition temperature of some fuel-air mixtures. What are 'Dark Factories,' and Do They Really Exist? This can be achieved by blanketing with nitrogen or carbondioxide. The conduit shall be made wrench tight to prevent sparking when fault current flows through the conduit system and to ensure the explosionproof or flameproof integrity of the conduit system where applicable. Outside of the United States, the IEC uses two different classifications: Gas & Vapor (Zones 0, 1, or 2) Dust (Zones 20, 21, or 22) Step 2: The next step is to determine how often the hazardous substance (s) is/are present. .14 . September 2019 November 2019 October 2020 Flameproof "d" - This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Conversely if the same material is heated and handled above its flash-point, the area must be classified for proper electrical system design, as it will then form an ignitable mixture.[5]. What is an Explosion Protection Document? International Electrotechnical Committee (IEC) Hazardous Area Classification. D8.1.3 Hazardous areas are subdivided into Zones 0,1 or 2, the definitions of each cate-gory being as follows: Zone 0 an area in which an explosive gas-air mixture is continuously present or present for long periods. Some manufacturers claim "suitability" or "built-to" hazardous areas in their technical literature, but in effect lack the testing agency's certification and thus unacceptable for the AHJ (Authority Having Jurisdiction) to permit operation of the electrical installation/system. All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides -in. In Europe the label must show the CE mark and the code number of the certifying/notified body). Zone 2 hazardous areas are typically storage areas but can also be process areas. >> NEC: Class I, Division 2, Group D. | IEC: Zone 2, Group II. Hazardous locations can also be described as those locations where electrical equipment March 2021 CLASSIFIED LOCATIONS: AREA CLASSIFICATION: AREA CLASSES: AREA GROUPS: LOCATION AS PER DIVISIONS: DIVISION 1 - Class I, Division 1 hazardous locations are defined (as per NEC code Article 500) as follows: DIVISION 2 - Class I Division 2 Locations are as follows: Area Classification by ZONES: DEFINITIONS: HAZARDOUS LOCATIONS: And there are three corresponding zones for dust: Zone 20, Zone 21 and Zone 22. Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. For equipment with metric threaded entries, such entries shall be identified as being metric, or listed adaptors to permit connection to conduit of NPT-threaded fittings shall be provided with the equipment. The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. Equipment provided with threaded entries for field wiring connection shall be installed in accordance with paragraph (g)(2)(iv)(A) or (g)(2)(iv)(B) of this section. Category 2 equipment may be used in zone 1 or zone 2 areas. 1: As a guide in determining when flammable gases or vapors are present continuously or for long periods of time, refer to ANSI/API RP 505-2018, Informational Note No. 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. Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. But first, we must consider what is likely to cause an explosion in the first place. The term equipment is applied both for fixed equipment and mobile equipment that are operated in such area. 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. FREEZER 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. A room with a propane gas installation will typically be classified with the. Empirical testing is done to determine parameters such as the maximum experimental safe gap (MESG), minimum igniting current (MIC) ratio, explosion pressure and time to peak pressure, spontaneous ignition temperature, and maximum rate of pressure rise. This level of risk is represented by classifying the hazardous area as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist atmospheres) or Zone 21 or Zone 22 for dust atmospheres. 1994-2020, W.W. Grainger, Inc. All Rights Reserved. hazardous areas as the following: An area where a potential hazard (e.g., a fire, an explosion, etc.) Informational Note No. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. The use of EPL and ATEX Category directly is an alternative for "s" marking. 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. A potential few examples of this are: The air space inside a tank of petrol Also included in the marking are the manufacturers name or trademark and address, the apparatus type, name and serial number, year of manufacture and any special conditions of use. This level of risk is represented by classifying the hazardous area as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist atmospheres) or Zone 21 or Zone 22 for dust atmospheres. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. Hazardous area equipment is categorized into category-1 for Zone 0 or Zone 20, category-2 for Zone 1 or Zone 21, and category-3 for Zone 2 or Zone 22. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. Non-hazardous or ordinary locations. The key difference between Divisions and Zones relate to terminations. The Zone system for classifying hazardous locations used in NFPA 70 NEC, IEC 60079, and the Canadian Electrical Code indicates the level of probability that a flammable concentration of a hazardous substance may be present. * Zone 1 a location in which explosive gas atmospheres are likely to occur during normal operation, or which is adjacent to a Zone 0 location. Note to paragraph (c)(2)(i) of this section: NFPA 70, the National Electrical Code, lists or defines hazardous gases, vapors, and dusts by "Groups" characterized by their ignitable or combustible properties. FEA NFPA 70 NEC Zone Classification System The Zone Classification System is offered as an alternative to the Class and Division system. to EN 1127-1): After the hazard area classification is completed, then the ignition assessment starts. . Each room, section, or area shall be considered individually in determining its classification. See below for further details: Division system sample marking Note to paragraph (g)(5)(ii)(C) of this section: The National Electrical Code, NFPA 70, contains guidelines for determining the type and design of equipment and installations that will meet this provision. December 2022 A list must be drawn up of every explosive material that is on the refinery or chemical complex and included in the site plan of the classified areas. Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures. Zone 0, 1 2 . The Zone system of hazardous area classification, defines the probability of the hazardous material, gas, or dust, being present in sufficient quantities that can generate explosive or ignitable mixtures. March 2022 Refrigerated So, it is good to know that when a flammable substance concentration exceeds the LEL, it will not automatically lead to an explosion with the highest Pmax. Where there is potential for an explosive atmosphere, special precautions are needed to prevent fires and explosions. Zone 22 Zone 21 Zone20 A hazardous atmosphere formed by dust cloud in air is not likely to occur in . Definition of hazardous area zones (AS/NZS 60079.10): Zone 0 Offshore Accommodation Module Ex s is a coding referenced in IEC 60079-0. Often an area classification plan view is provided to identify equipment ratings and installation techniques to be used for each classified area. For dusts: Zone 20, Zone 21 and Zone 22. Exception No. NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. 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. No representation is made that the information or references are complete or remain current. In order to understand hazardous area classification it is important to understand which factors contribute to the occurrence of an explosion. These generally give rise to areas classied as Zones 0, 1, and 2 respectively. Which system is preferred depends on the users preference, how the areas are classified, and the wiring system used. For example, a socket outlet labeled EEx'de' might have a case made to EEx 'e' and switches that are made to EEx 'd'. Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. ignitable concentrations of dust, fibers, or flyings are present for long periods of time, ignitable concentrations of dust, fibers, or flyings are likely to exist under normal conditions, ignitable concentrations of dust, fibers, or flyings unlikely to exist under normal conditions, Metal dusts, such as magnesium (Division 1 only), Carbonaceous dusts, such as carbon & charcoal, Non-conductive dusts, such as flour, grain, wood & plastic, Ignitible fibers/flyings, such as cotton lint, flax & rayon, Ignitible fibers or flyings, such as cotton lint, flax & rayon. These would be then labeled with each of the individual methods. Adapters shall be used for connection to conduit or NPT-threaded fittings. Purged and pressurized -- This protection technique is permitted for equipment in the Class I, Zone 1 or Zone 2 locations for which it is approved. Area's are divided into zones. Area classification documentations are reviewed and updated to reflect process changes. For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. 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. Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. See Figure S-1 for an explanation of this marking. The Zone system has three levels of hazard for gas or dust where the Division system has two. Entire Vapour space of storage tank. Equipment marked as suitable for Group IIC is also suitable for IIB and IIA. Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). 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. The following Equipment Groups and Categories are applicable: Equipment in this category is only intended for use in the underground areas of mines, as well as those areas of surface installations of such mines endangered by firedamp and/or combustible dusts. 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 housing may be strong enough to contain and cool any combustion gases produced internally. Typical gas hazards are from hydrocarbon compounds, but hydrogen and ammonia are also common industrial gases that are flammable. API 500/505 mostly for onshore and offshore oil and gas applications. Groups A, B, C, and D are for gases (Class I only). Area which are not devided into Atex zones, are called non-hazardous area's. Informational Note No. Ignition sources can be divided in 13 categories (acc. Locations are thus classified by type and risk of release of gas, vapor, or dust. area in which an explosive gas atmosphere is not likely to occur in normal operation, but, if it does occur, will exist for a short period only (less than 0,1% of the time), Window breakage, cracks plaster, light damage to buildings, Collapse of wood or asbestos siding of homes, Collapse of walls made of concrete blocks, Reinforced concrete structures severely damaged, Flames and hot gases (including hot particles), Mechanically generated impact, friction and abrasion, Stray electric currents, cathodic corrosion protection, Radio frequency (RF) electromagnetic waves from 10, Exothermic reactions, including self-ignition of dusts, EI 15 Energy Institute 15, mostly for on- and offshore oil and gas applications. 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). The process of determining the type and size of hazardous locations is called classification. The upper explosion limit of a substance is the highest concentration (in volume percentages for gases and liquids) of a gas or a vapor in air capable of producing a flash of fire in the presence of an ignition source. 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! 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. Zone 0 is reserved for those areas continuously hazardous (e.g., inside a vented fuel tank), so other Division 1 areas would be classified as Zone 1. An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 September 2019. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. Specific types of protection being used will also be marked. Zones 1 or 2. The colour of the luminaire body indicates the level of protection. But every hazardous area is different and each has specific requirements depending on the nature of the atmosphere and the elements that are present. . Refrigerated Container Informational Note No. Explosions can cause significant damage along with severe injury or worse loss of life. All rights reserved. For non-ambient conditions, like process reactors or other enclosed systems, the Limiting Oxygen Concentration is often used for the prevention of explosive atmospheres within those enclosed areas. June 2019 1: Normal operation is considered the situation when plant, Informational Note No. the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). Electronic equipment, including lighting, needs to be purpose designed for use in hazardous areas to prevent a spark occurring and igniting any flammable substances. It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). Equipment marked as suitable for IIB is also suitable for IIA but NOT for IIC.

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