Various regulations use terms such as class, division, zone, and group to differentiate the various hazards. Fundamentally, for an explosion to take place, flammable or explosive gases, vapours, mists or dusts will be present. NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). Directly adjacent on the label one will find the mark of the listing agency. January 2021 Groups E, F, and G are for dusts and flyings (Class II or III). Use this hazardous area guide to NFPA 70 location classes, divisions & groups to understand potentially dangerous situations at a glance. Dry Container Zones 1 or 2. All equipment in Division 1 areas must have an approval label, but certain materials, such as rigid metallic conduit, does not have a specific label indicating the Cl./Div.1 suitability and their listing as approved method of installation in the NEC serves as the permission. All areas in the facility that are not Zone 0, Zone 1, or Zone 2 are considered unclassified. There are several ways of how to perform hazardous area classification, all described in several standards or codes of practise. 5: For further information on ventilation, see NFPA 30-2018, Informational Note No. Zone 0: flammable atmosphere highly likely to be present - may be present for long periods or even continuously . The CE mark is complemented with the Ex mark: A yellow-filled hexagon with the Greek letters (epsilon chi), followed by the Group, Category, and, if Group II, G or D (gas or dust). Offshore Living Quarter 15 4. according to ISO standard 80079 series. Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation occasionally To prevent explosions from happening in harsh environments whereby flammable gases or combustible dusts are present directives and guidelines are put in place to protect both the public, workforce, and environment. June 2019 Powder Filling "q" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. . Exception No. The first thing to understand is that much like the metric vs imperial measuring systems, the United States uses its own methodology which differs from much of the world. In Europe the label must show the CE mark and the code number of the certifying/notified body). For specific industries, the specific codes for that industry are important to use. Area (mm2) CFD BS EN 60079-10-1:2009 1 5.0 5.0 0.0936 12.3 - 61.7 2 5.0 2.5 0.0326 6.17 - 30.8 Determined to be none of the above. Protecting against fire and explosion is of interest for both personnel safety as well as reliability reasons. For Zone 1 applications, Pyroban uses . 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 use of EPL and ATEX Category directly is an alternative for "s" marking. For example, in the US by the Occupational Safety and Health Administration. The NEC Zone system was created to harmonize with IEC classification system, and therefore reduce the complexity of management. Zone 2 Explosive Mixtures not likely to occur /occur short duration in normal operation (lt10 Hrs/ Yr). Specific types of protection being used will also be marked. Division II Comprising of Area Same as Zone 2. Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. December 2013, All The following content is only related to flammable substances and not to pyrotechnic substances or other instable substances, among those who can decompose. 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. Zone type (0/1/2/ 20/21/ 22) Zone extent. In Europe and the rest of the world - but also more and more in North America - the Zone system is used. Well recognized and clear IEC Standard IEC 60079-10-2:2015 Hazardous Area Classification for explosive dusts Significant influence on spending's for safety . >> For Gas Vapor this would be Zone 1. 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. Area ClassificationThe max surface temp. . ethanol, methane or hydrogen. . 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. Safety is ensured in the event of frequently occurring disturbances or equipment faults which normally have to be taken into account. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. NEGATIVE PRESSURE November 2020 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. The prevention of explosions in working environments is in most countries regulated in national laws and directives. The housing may be strong enough to contain and cool any combustion gases produced internally. Photo 2. Equipment in this category is intended for use in Zone 0 areas (gases) or Zone 20 (dusts), and must ensure a very high level of protection (i.e. December 2022 Feedback From Clients Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). Explosion Hazardous Areas are divided into zones according to risk probabilities. In the US, the National Electrical Manufacturers Association (NEMA) defines standards for enclosure types for a variety of applications. 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. An explosion is a rapid expansion in volume associated with an extremely vigorous outward release of energy, usually with the generation of high temperatures and release of high-pressure gases (wikipedia (https://en.wikipedia.org/wiki/Explosion). Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? 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. No. 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 other aspect of safety receives more attention in the form of codes and standards. Category 3 equipment may only be used in zone 2 areas. For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. The definition of Zone 2 is a hazardous area classified as an atmosphere where a mixture of air and flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation, but if it does occur, will persist for a short period only. Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . 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. Note to paragraph (g)(5)(ii)(B) of this section: An example of such a required marking is "Class I, Zone 0, AEx ia IIC T6." >> For Gas/Vapor this would be Zone 2. Beside the Lower Explosion Limit, each substance also has an Upper Explosion Limit (UEL). We don't save this data. Zone 0 - Explosive atmospheres present continuously long periods or frequently. Ex s is a coding referenced in IEC 60079-0. Other ignition sources can also be present, like static electricity. Intrinsic safety designs equipment to operate using minimal energy, insufficient to cause ignition. Informational Note No. These generally give rise to areas classied as Zones 0, 1, and 2 respectively. 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. Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. In some cases, the hazardous atmosphere is present all the time, or for long periods. WELDING INSPECTION What is an Explosion Protection Document? September 2022 Temperature Control This page was last edited on 20 January 2023, at 22:32. And safety must be guaranteed in the case of two faults occurring independently of each other. NEC Div 1 Zone 1 Div 2 Zone 2Flammable during normal operation Most Safer Zone IEC Zone 0 DESRIPTIONHighly Flammable for long period DEFINITIONFlammable atmosphere present continuously (Typically 1000 hours / year). See below for further details: Division system sample marking 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. 1: For examples of area classification drawings, see ANSI/API RP 505-2018, Informational Note No. This rapid expansion of volume is caused by the combustion of a fuel, like e.g. IECEx Karandikar Certification Flour, wood/sawdust, plastic dust), IIC Conductive dusts (eg. August 2022 Note to paragraph (g)(4) of this section: Low ambient conditions require special consideration. Electrical equipment can and does cause fires and/or explosions in certain atmospheres. But beside electrical equipment also mechanical equipment must be Ex certified, e.g. Zone 0 Zone 1 Zone 2 Fluid Occurrence of explosive atmosphere Gas mixtures Dust mixtures Not likely to occur or only for short period Zone 2 Zone 22 . A: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. The IEC 60079 standard set has been adapted for use in Australia and New Zealand and is published as the AS/NZS 60079 standard set. August 2020 The choice of which standard to use for the hazardous area classification is something which is very important. Class 1/Div 2 ATEX Zone 2 Computers. It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . Entire Vapour space of storage tank. Zones 0, 1 and 2: Atmospheres with explosive gases and vapours (AS2380; AS/NZS/IEC 60079) Zone 0 Area The definition according to IEC60079-10-1 is "an area in which an explosive gas atmosphere is present continuously or for long periods or frequently". gas, vapours, mists and dusts). In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). This process is called hazardous area classification. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. API 500/505 mostly for onshore and offshore oil and gas applications. The part codes for each SPARTAN variant also differ depending on the level of protection required. 2: For the requirements for electrical and electronic. Equipment approved for Class I, Division 1 or Class 1, Division 2 shall, in addition to being marked in accordance with (c)(2)(ii), be marked with the following: Class I, Zone 1 or Class I, Zone 2 (as applicable); Applicable gas classification groups; and. 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). 0. Every substance has a differing combination of properties but it is found that they can be ranked into similar ranges, simplifying the selection of equipment for hazardous areas. October 2020 Dn 1 - a Ce e . Zone 1 2. That flammable gas or vapor . Area's are divided into zones. We don't collect information from our users. | For Dust this would be Zone 22. The equipment group . This blog post will focus on the different hazardous location classifications and well follow up with another that discusses how equipment can be constructed and certified for use in these environments. [4], Flammability of combustible liquids are defined by their flash-point. 3: Text that is followed by a reference in brackets has been extracted from NFPA 497-2017, All other applicable rules contained in this, Where the term "Class I" is used with respect to, Informational Note: The term "Class I" was originally included as a prefix to, All areas in industrial occupancies designated as hazardous (classified). 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. 7: For further information on application of electrical, Informational Note No. 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. November 2019 Home About Us News Hazardous Environment Classifications: NEC vs IEC, Posted March 11, 2019 by springercontrols. Class I: hazardous because flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures: . Container Test When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. September 2018 We will go deeper into ignition assessments in another blog. Atmospheres containing non-conductive dust. However, the following provisions modify this marking requirement for specific equipment: Fixed lighting fixtures marked for use in Class I, Division 2 or Class II, Division 2 locations only need not be marked to indicate the group; Fixed general-purpose equipment in Class I locations, other than lighting fixtures, that is acceptable for use in Class I, Division 2 locations need not be marked with the class, group, division, or operating temperature; Fixed dust-tight equipment, other than lighting fixtures, that is acceptable for use in Class II, Division 2 and Class III locations need not be marked with the class, group, division, or operating temperature; and. Atmospheres containing combustible flyings. Equipment used in hazardous area must comply to certain Ex standards. 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. Zone 1 is an area that is classified 'as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapours and mists is likely to occur occasionally during normal operation', whereas Zone 2 is an area that is classified 'as a place in which an explosive atmosphere consisting of a mixture Canada has a similar system with CSA Group standard C22.1, the Canadian Electrical Code, which defines area classification and installation principles. Offshore Accommodation Module 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 two general approaches are: Several techniques of flame-proofing exist, and they are often used in combination: Equipment has flameproof gaps (max 0.006" (150m) propane/ethylene, 0.004" (100m) acetylene/hydrogen), Equipment can be installed in ANY housing provided to IP54.A 'Zener Barrier', opto-isolator or galvanic unit may be used to assist with certification. These ways of protection are specified in detail within several IEC standards (IEC 60079 series) for electrical equipment. These would be then labeled with each of the individual methods. The term equipment is applied both for fixed equipment and mobile equipment that are operated in such area. 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. Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. 2: Where gas detection, Informational Note No. No hidden fees. For example, within the U.K. in the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) and in the U.S. in the Occupational Safety and Health Act of 1970 (OSHA). Pit will be considered as Zone 1. 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. . 286 natural gas explosions per year in the U.S. causing substantial damage, severe injury or loss of lives. 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. Some equipment in Division 2 areas do not require a specific label, such as standard 3 phase induction motors that do not contain normally arcing components. Electronic equipment, including lighting, needs to be purpose designed for use in hazardous areas to prevent a spark occurring and igniting any flammable substances. Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. Carbon monoxide, ether, hydrogen sulfide, . 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. The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. If equipment is marked, for example, Ex e II T4 then it is suitable for all subgroups IIA, IIB and IIC. Recommendat ions. Zone 22 Zone 21 Zone20 A hazardous atmosphere formed by dust cloud in air is not likely to occur in . 2: This classification includes, Informational Note No. 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! Ambient Temperature (-20C to +40C if not marked) Establish Zone Based on "IEC 60079-10". So a zone 0 is the most hazardous zone and a zone 2 is a less hazardous zone. Equipment that the employer demonstrates will provide protection from the hazards arising from the flammability of the gas or vapor and the zone of location involved and will be recognized as providing such protection by employees need not be marked. For equipment provided with threaded entries for NPT threaded conduit or fittings, listed conduit, conduit fittings, or cable fittings shall be used. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Dn 2 - a Ce d e r . 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]. 10: For information on electrical resistance trace heating for hazardous (classified), Informational Note No. Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 September 2019. Comments. Equipment marked as suitable for IIB is also suitable for IIA but NOT for IIC. 2: This classification usually includes, (B) Special Occupancies, Zone 0, 1, and 2 Locations, Article 505 Special Occupancies, Zone 0, 1, and 2 Locations, (B) Special Occupancies, Class I, Zone 0, 1, and 2 Locations, National Electrical Code 2020 of Illinois, National Electrical Code 2017 of Illinois, Ignitible concentrations of flammable gases or vapors are present continuously, Ignitible concentrations of flammable gases or vapors are present for long periods of time, In which ignitible concentrations of flammable gases or vapors are likely to exist under normal operating conditions; or, In which ignitible concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage; or, In which ignitible concentrations of flammable gases or vapors are not likely to occur in normal operation and, if they do occur, will exist only for a short period; or, In which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used but in which the liquids, gases, or vapors normally are confined within closed containers of closed systems from which they can escape, only as a result of accidental rupture or breakdown of the containers or system, or as a result of the abnormal operation of the, In which ignitible concentrations of flammable gases or vapors normally are prevented by positive mechanical ventilation but which may become hazardous as a result of failure or abnormal operation of the ventilation. 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. hazardous areas as the following: An area where a potential hazard (e.g., a fire, an explosion, etc.) Non-hazardous or ordinary locations. Comparison of Zones and Divisions. July 2022 Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Which system is preferred depends on the users preference, how the areas are classified, and the wiring system used. The Regulations define 3 zones that can exist within a hazardous area: Zone 0 - A place in which an explosive atmosphere is present continuously or for long periods. There are three zones for gas: Zone 0, Zone 1 and Zone 2. FEA 6: For further information on electrical systems for hazardous (classified), Informational Note No. Container Standards For example, a socket outlet labeled EEx'de' might have a case made to EEx 'e' and switches that are made to EEx 'd'. Area Classification. (Hazardous Area Classification) . A 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. Explosions can cause significant damage along with severe injury or worse loss of life. A more quantitative method is described in IEC 60079-10-1 but also more sophisticated numeric mathematical models can be used like Computational Fluid Dynamics. In the United States, the NEC uses 2 different classifications: 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. September 2019 Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. . One of the hazards of working with flammable substances is an explosion, mostly hand in hand with fire. October 2019 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. ), Group F Carbon-based (eg. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion.

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