Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? Where pyrophoric materials are the only materials used or handled, these locations need not be classified. 2: Where gas detection, Informational Note No. Well recognized and clear IEC Standard IEC 60079-10-2:2015 Hazardous Area Classification for explosive dusts Significant influence on spending's for safety . Comments. Drop Test 286 natural gas explosions per year in the U.S. causing substantial damage, severe injury or loss of lives. Zone 0, 1 2 . 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. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. Container Standards A special standard for instrumentation is IEC/EN 60079-27, describing requirements for Fieldbus Intrinsically Safe Concept (FISCO) (zone 0, 1 or 2) (This special standard has been withdrawn, and has been partially replaced by: IEC/EN60079-11:2011 and IEC/EN60079-25:2010)[1], A special standard for instrumentation is IEC/EN 60079-27, describing requirements for Fieldbus Non-Incendive Concept (FNICO) (zone 2) (This special standard has been withdrawn, and has been partially replaced by: IEC/EN60079-11:2011 and IEC/EN60079-25:2010)[9]. Container Accessories 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. February 2019 Magnesium, Titanium), IIB Nonconductive dusts (eg. Under the "Zone" system, hazards are defined for gas as Zone 0, 1 or 2, with 0 as the highest hazard, and for dust as Zone 20, 21 or 22, with 20 as the . When the concentration of gas or vapor is beneath the LEL the gas mixture is too lean to burn. 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. 1. A Class I, Division 1 or Division 2 location may be reclassified as a Class I, Zone 0, Zone 1, or Zone 2 location only if all of the space that is classified because of a single flammable gas or vapor source is reclassified. 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. December 2021 Adapters shall be used for connection to conduit or NPT-threaded fittings. A60 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. Refrigerated Container In the United Kingdom, Sira and Baseefa are the most well known such bodies. 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]. Use this hazardous area guide to NFPA 70 location classes, divisions & groups to understand potentially dangerous situations at a glance. (Hazardous Area Classification) . 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. Division II Comprising of Area Same as Zone 2. Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. Zone type (0/1/2/ 20/21/ 22) Zone extent. API 500/505 mostly for onshore and offshore oil and gas applications. Laboratory Container Substances characterization Consequences . Note to paragraph (g)(4) of this section: Low ambient conditions require special consideration. 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. Equipment that is safe for the location shall be of a type and design that the employer demonstrates will provide protection from the hazards arising from the combustibility and flammability of vapors, liquids, gases, dusts, or fibers involved. . Groups E, F, and G are for dusts and flyings (Class II or III). The colour of the luminaire body indicates the level of protection. Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus. AddThis use cookies for handling links to social media. Category 1 equipment may be used in zone 0, zone 1 or zone 2 areas. Container Test 0. Flour, wood/sawdust, plastic dust), IIC Conductive dusts (eg. >> For Gas/Vapor this would be Zone 2. 10: For information on electrical resistance trace heating for hazardous (classified), Informational Note No. 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 . | For Dust this would be Zone 22. NFPA 70 NEC Zone Classification System The Zone Classification System is offered as an alternative to the Class and Division system. October 2020 Please read AddThis Privacy for more information. An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. (equivalent to NEC Class I, Groups A and B), (equivalent to NEC Class II, Groups F and G), Group IIC is the most severe zone system gas group. For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. The NEMA enclosure rating or IP code may also be indicated, but it is usually independent of the Classified Area suitability. Feedback From Clients No. Dry Container 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. Informational Note No. Type of protection "n" -- This protection technique is permitted for equipment in the Class I, Zone 2 locations for which it is approved. 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. Classification of areas and selection of equipment and wiring methods shall be under the supervision of a qualified registered professional engineer. 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. The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. The International Electrotechnical Commission publishes the 60079 series of standards[2] which defines a system for classification of locations, as well as categorizing and testing of equipment designed for use in hazardous locations, known as "Ex equipment". Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. HAZARDOUS VS. Area ClassificationThe max surface temp. What is an Explosion Protection Document? Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. A hazardous area classification drawing (also known as an area classification drawing) outlines the classifications of areas where flammable liquids, gasses or vapors are handed, processed or stored. July 2022 Where there is potential for an explosive atmosphere, special precautions are needed to prevent fires and explosions. Ignition sources can be divided in 13 categories (acc. Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation. A Zone 0 location is a location in which one of the following . March 2022 The value is represented is volume percentage of oxygen. It is good to be aware of the fact that the mixture of flammable gas with oxygen has an optimum point where the combustion is most severe and leads to the highest explosion pressure. You can target the Engineering ToolBox by using AdWords Managed Placements. Accommodation Cabin NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). There are three necessary components for an explosion to occur; This needs to be present in a relatively high quantity to produce an explosive mixture (e.g. In general, all types of equipment installed within the hazardous area shall be . Dn 1 - a Ce e . An oversimplification of this example is shown in Table 1. Although every application is different, for the ease of monitoring and specification each hazardous area is classified as a particular level or zone. And there are three corresponding zones for dust: Zone 20, Zone 21 and Zone 22. [3], Different explosive atmospheres have chemical properties that affect the likelihood and severity of an explosion. 7: For further information on application of electrical, Informational Note No. Class I, Zone 0 = Area Classification, AEx = Symbol for equipment built to American specifications, ia = Type of protection designations, IIC = Gas classification group (as required), T6 = Temperature Classification, [46 FR 4056, Jan. 16, 1981; 46 FR 40185, Aug. 7, 1981; 72 FR 7210, Feb. 14, 2007], Occupational Safety & Health Administration. These areas only become hazardous in case of an accident or some unusual operating condition. The label will always list the class, division and may list the group and temperature code. This is because Zone 0 usually classifies areas for gas storage or containment, and any lighting required would be used on a small and portable basis for visual inspection, e.g. Raytec do not currently offer any lighting solutions for Zone 0. This leads to a lot of the confusion in the global marketplace because certifying equipment to these different systems can be time consuming and expensive, so many companies may only certify to one or the other.
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