Example - Hazardous Area Classification A room with a propane gas installation will typically be classified with the Class/Division system as: Class I, Division 2, Group D Zone system as: Zone 2, Group IIA THE CURRENT STANDARD . Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 September 2019. Class II, Div 2 Class III, Div 1 nR 3G Zone 2 Gc Class III, Div 2 Pressurised Room px 60079-13 2G Zone 1 Gb Zone 21 Db 2D Pressurised Room FM3611 NFPA 496 Class I, Div 1 Class I, Div 2 Class II, Div 1 Class II, Div 2 py 2G Zone 1 Gb pz 3G Zone 2 Gc Zone 22 Dc 3D pv Non-hazardous Gb/GC Optical Radiation op sh 60079-28 1G Zone 0 Ga Zone 20 Da 1D . Class I: hazardous because flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures: . In many industrial, commercial, and scientific settings, the presence of such an atmosphere is a common, or at least commonly possible, occurrence. Equipment that is listed for a Zone 1 location may be installed in a Zone 2 location of the same gas or vapor. Photo 2. the inside of tank truck or the interior of a dust filter). Equipment is placed into protection level categories according to manufacture method and suitability for different situations. August 2021 But first, we must consider what is likely to cause an explosion in the first place. 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. A: No. The autoignition temperature is the lowest temperature at which the substance will ignite without an additional heat or ignition source (at atmospheric pressure). The part codes for each SPARTAN variant also differ depending on the level of protection required. This is exactly defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. less than 0.45 mm or MIC ratio is less than 0.40. All areas in the facility that are not Zone 0, Zone 1, or Zone 2 are considered unclassified. 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. Equipment shall be marked in accordance with paragraph (g)(5)(ii)(A) and (g)(5)(ii)(B) of this section, except as provided in (g)(5)(ii)(C). Informational Note No. A: Yes. WATER TIGHTNESS February 2021 The Raytec SPARTAN range includes dedicated luminaires for both Zone 1 and Zone 2 areas as well as industrial applications. Wide known is that al electrical equipment within hazardous areas must be Ex certified for use in the appropriate hazardous area (zone or class/division). Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. Read more in our blogWhich Standards to use for Hazardous Area Classification. Workshop Container, Intelligent pressurised container | MUD logging cabin, Battery energy storage system (BESS) container, Laboratory container | workshop container | Equipment containers, Temporary refuge shelter | Toxic gas refuge | Safe haven, Offshore accommodation cabin | office container, Reefer container | Refrigerated container, Intelligent waste water treatment container, IDENTIFYING ZONE 0, ZONE 1, AND ZONE 2 HAZARDOUS AREAS, Temporary refuge (TR) shelter, toxic gas refuge (TGR), Containerised waste water treatment plant. All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides -in. 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. Informational Note: For further information regarding classification and ventilation of areas involving closed-circuit ammonia refrigeration systems, see ANSI/IIAR 2-2014. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. 9: For additional information concerning the installation of, Informational Note No. Zone 22 Zone 21 Zone20 A hazardous atmosphere formed by dust cloud in air is not likely to occur in . 6: For further information on electrical systems for hazardous (classified), Informational Note No. Group is divided in three groups where Group I is reserved for mining locations. These areas are classified solely for the purpose of ensuring the safe and proper specification and installation of electrical/electronic equipment. Where pyrophoric materials are the only materials used or handled, these locations need not be classified. Informational Note No. Safety is ensured in the event of frequently occurring disturbances or equipment faults which normally have to be taken into account. Zone 0, 1 2 . Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . 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. All rights reserved. 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. Australia and New Zealand use the same IEC-60079 standards (adopted as AS/NZS60079), however the CE mark is not required. To make this even easier to understand, take a look at the diagram of a typical petrol station below where we have identified the areas that are classified as Zone 0, Zone 1 and Zone 2. These areas are in North America (United States and Canada) historically classified with the Class/Division system. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). See Figure S-1 for an explanation of this marking. HAZARDOUS VS. Since the changes to the code, hazardous locations with gases or vapors (Class I) present can be reclassified as Zone 0, 1 or 2. A potential few examples of this are: The air space inside a tank of petrol 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. - Zone 0: An area where an explosive gas-air mixture is continuously present or present for long time (continuous hazard, whose estimated duration is higher than 1000 hours/year) - Zone 1: An area where an explosive gas-air mixture is likely to occur during normal . we will look at what defines Zone 0, Zone 1 and Zone 2 hazardous area classifications and the considerations for specifying lighting into each area. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. 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. 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] Hazardous area classification. API RP 505, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1, and Zone 2 (as incorporated by reference in 250.198). 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). So for an explosion there must be enough fuel. 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). Determined to be none of the above. Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Laboratory Container The inductance of the signal bell coils, combined with breaking of contacts by exposed metal surfaces, resulted in sparks, causing an explosion. FREEZER Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation. Unlike ATEX which uses numbers to define the safety "Category" of equipment, namely (1,2 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since 2009. Electronic equipment, including lighting, needs to be purpose designed for use in hazardous areas to prevent a spark occurring and igniting any flammable substances. In an industrial plant, such as a refinery or chemical plant, handling of large quantities of flammable liquids and gases creates a risk of exposure. - 1 2 (Class 1, . Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. >> NEC: Class I, Division 2, Group D. | IEC: Zone 2, Group II. There are three zones for gas: Zone 0, Zone 1 and Zone 2. 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). 3: For further information on the classification of, Informational Note No. July 2021 Requirements for good HAC Drawings and Plans. This is an important factor in the classification of hazardous areas. Sources Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. 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. This can be achieved by blanketing with nitrogen or carbondioxide. The NEC Zone system was created to harmonize with IEC classification system, and therefore reduce the complexity of management. Informational Note No. 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. Adapters shall be used for connection to conduit or NPT-threaded fittings. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. May 2022 Flameproof "d" - This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Zone 1 2. 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 prevention of explosions in working environments is in most countries regulated in national laws and directives. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. 1: Normal operation is considered the situation when plant, Informational Note No. Substances characterization Consequences . taper per foot. 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. We don't save this data. Google use cookies for serving our ads and handling visitor statistics. July 2022 October 2019 See below for further details: Division system sample marking July 2019 A spark or high heat must also be present. 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. . Zone 0/20: An area in which an explosive atmosphere is present continuously or for long periods or frequently. Class I, Zone 0 or Zone 1 locations may not abut Class I, Division 1 or Division 2 locations. The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. Documentation requirements likewise vary. 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. SEWAGE TREATMENT Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. . Ignition sources can be divided in 13 categories (acc. Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Cookies are only used in the browser to improve user experience. September 2018 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. Within the European Union, these are defined by IEC/EN standards (IEC/EN 60079-10-1 or 2) as directed by ATEX. As a guide for Zone 0, this can be defined as over 1000 hours/year or >10% of the time. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. Figures show that appr. It may exist because of repair, maintenance operations, or leakage. In effect it is any method which can be shown to have the required degree of safety in use. Zone 2 - Explosive atmospheres are unlikely to occur or present only infrequently and for a short period only. Pit will be considered as Zone 1. (1) Zone 0. Zones. The colour of the luminaire body indicates the level of protection. Ex s is a coding referenced in IEC 60079-0. >> NEC: Class II, Division 1, Group F. | IEC: Zone 20, Group IIC. [4], Flammability of combustible liquids are defined by their flash-point. Class I hazardous locations are identified by zones as follows: * Zone 0 a location in which explosive gas atmospheres are present continuously or for long periods of time.
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