The process of determining the type and size of hazardous locations is called classification. . NFPA 70 NEC Zone Classification System The Zone Classification System is offered as an alternative to the Class and Division system. NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. Adapters shall be used for connection to conduit or NPT-threaded fittings. Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. For specific industries, the specific codes for that industry are important to use. NEGATIVE PRESSURE Hazards in this group gas can be ignited very easily indeed. The value is represented is volume percentage of oxygen. The flash point determines if an area needs to be classified. 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. In Europe the ATEX 114 Directive (2014/34/EU) is applicable to equipment that is used in hazardous area's. 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. Specific types of protection being used will also be marked. Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 . 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. These would be then labeled with each of the individual methods. Area's are divided into zones. December 2013, All | For Dust this would be Zone 22. Ways to ensure this level of safety are non-arcing design and limitation of the temperature of the equipment. But first, we must consider what is likely to cause an explosion in the first place. Groups A, B, C, and D are for gases (Class I only). Class 1/Div 2 ATEX Zone 2 Computers. Hazardous area classification is a rigorous method of determining where an explosive environment may be present. Therefore, it is very important to make sure that you are using a suitable luminaire for your application by choosing your fitting based on its suitability for the Zone in which it will be located. Flameproof "d" - This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. In this article 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. March 2022 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. 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. Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. Pit will be considered as Zone 1. Locations shall be classified depending on the properties of the flammable vapors, liquids, or gases that may be present and the likelihood that a flammable or combustible concentration or quantity is present. Youre phone isnt rated for use in hazardous areas. 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 Comparisons between the two systems are not easily accomplished. In Northerm America, instead of the zone classification system, the Class/Division system is used. Category 1 equipment may be used in zone 0, zone 1 or zone 2 areas. Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). Offshore Living Quarter Area ClassificationThe max surface temp. 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. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. It is essential to know which zone you are working in, so that you can specify the most appropriate equipment. Category 3 equipment may only be used in zone 2 areas. 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. An oversimplification of this example is shown in Table 1. When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. CUTTING SKIPS No. 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). Determined to be none of the above. Zone 1 if gas group & temp. But beside electrical equipment also mechanical equipment must be Ex certified, e.g. TLS OFFSHORE CONTAINER Drop Test Exception No. FREEZER The flash-point is the temperature at which the material will generate sufficient quantity of vapor to form an ignitable mixture. The key difference between Divisions and Zones relate to terminations. NFPA 70, the National Electrical Code (NEC), defines area classification and installation principles. Hazardous Area Classification (HAC) is as follows: Definitions of hazardous area are different as per IEC and NEC. In Europe the label must show the CE mark and the code number of the certifying/notified body). No representation is made that the information or references are complete or remain current. of In the United States, the NEC uses 2 different classifications: Zones also have the added benefit of including the area classification with the zone description. November 2021 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). Oxygen is required in high quantities and in combination with the flammable substance to produce an explosive atmosphere. Hazardous Areas - North America Classification, international method of area classification, Protection Techniques for Hazardous Areas - North America, Hazardous because combustible or conductive, Atmosphere containing combustible metal dusts, including. 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. 2: Through the exercise of ingenuity in the layout of electrical installations for hazardous (classified), Refrigerant machinery rooms that contain ammonia refrigeration systems and are equipped with adequate mechanical ventilation that operates continuously or is initiated by a detection system at a concentration not exceeding 150 ppm shall be permitted to be classified as "unclassified". 1.1.2 This recommended practice provides information on specific flammable gases and vapors, flammable liquids . We don't save this data. Hazardous areas are those defined as areas of potential explosion risk due to the presence of flammable gas or vapor. June 2022 The definition of the hazardous area zones represent the likelihood of hazardous gas, dust or other hazards being present in a working area. 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. 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). Pressurised Container Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. Zone 0, 1 2 . January 2023 . 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. Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. - 1 2 (Class 1, . These generally give rise to areas classied as Zones 0, 1, and 2 respectively. Zone 0 - Explosive atmospheres present continuously long periods or frequently. The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. (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. - 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 . 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. 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. 1: Normal operation is considered the situation when plant, Informational Note No. Figures show that appr. In the US, the independent National Fire Protection Association (NFPA) publishes several relevant standards, and they are often adopted by government agencies. Readers with specific questions should refer to the applicable standards or consult with an attorney. The plan may contain the list of chemicals with their group and temperature rating. Dn 1 - a Ce e . 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. Container Standards In other cases, the atmosphere is normally non-hazardous, but a dangerous concentration can be reasonably foreseensuch as operator error or equipment failure. Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). Explosion-proofing designs equipment to contain ignition hazards, prevent entry of hazardous substances, and, contain any fire or explosion that could occur. Table 1. This paper will discuss and review the current approaches and solutions of dealing with these HSE concerns, especially with the involvement of hazardous and potentially flammable and explosive chemicals. SIGN UP FOR EMAILGet more great content in your inbox. IEC 60079-10-1 covers classification of explosive gas atmospheres, and IEC 60079-10-2 explosive dust. Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. Safe for the hazardous (classified) location. This is an important factor in the classification of hazardous areas. December 2020 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. Zone 1 an area in which an explosive gas-air mixture is likely to occur in normal operating conditions. A room with a propane gas installation will typically be classified with the. When the concentration of methane is beneath the LEL, an explosion cannot occur, even when an ignition source is present. September 2020 [10][11] Some of these are specifically for hazardous locations: All equipment certified for use in hazardous areas must be labelled to show the type and level of protection applied. So the flammable range of a substance is the concentration of gases and vapors in air between the Lower Explosion Limit and the Upper Explosion Limit. Informational Note No. Australia and New Zealand use the same IEC-60079 standards (adopted as AS/NZS60079), however the CE mark is not required. Temporary Refuge 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. Group C materials have a MESG less than 0.75mm and a MIC ratio less than 0.80 (but greater than 0.40, which would put it in Group B.) 3: For further information on the classification of, Informational Note No. Requirements for good HAC Drawings and Plans. Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Gas a. There are two systems in place, including the traditional North American Division system as well as the alternative Zone system. Dry Container Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures. area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. BATTERY ENERGY STORAGE SYSTEMBESS) So yes, it is important to choose the right model and always wonder what am I assessing?. >> For Gas Vapor this would be Zone 1. 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). THE PRODUCTS YOU NEED, Gases, Vapors and Mists. Groups E, F, and G are for dusts and flyings (Class II or III). 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. April 2021 Accommodation Cabin 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". 11: For information on electric skin effect trace heating for hazardous (classified), Informational Note No. 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. This temperature is used for classification for industry and technology applications.[6]. ADNOC The part codes for each SPARTAN variant also differ depending on the level of protection required. Methane has a UEL of 17 vol%, which means when the concentration of methane in air is above the 17 vol% an explosion cannot occur even when an ignition source is present. The temperature classification on the electrical equipment label will be one of the following (in degree Celsius): The above table shows that the surface temperature of a piece of electrical equipment with a temperature classification of T3 will not rise above 200C. 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. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. This process is called hazardous area classification. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . 1.1 Scope. June 2020 This is also one of the first steps when composing an Explosion Protection Document. Offshore Accommodation Module But when we take a closer look at the graph and table, we can conclude that any explosion, can easily lead to severe damage. Documentation requirements likewise vary. 29 CFR 1910.399 Definitions Applicable to Subpart S 9: For additional information concerning the installation of, Informational Note No. The last requirement for the explosion is the presence of an ignition source, like a spark or hot surface. It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. (1) Zone 0. No long-term contract. You can target the Engineering ToolBox by using AdWords Managed Placements. May 2022 Sources of The overpressure is monitored, maintained and controlled. Which Standards to use for Hazardous Area Classification. November 2019 Those guidelines address electric wiring, equipment, and systems installed in hazardous (classified) locations and contain specific provisions for the following: wiring methods, wiring connections; conductor insulation, flexible cords, sealing and drainage, transformers, capacitors, switches, circuit breakers, fuses, motor controllers, receptacles, attachment plugs, meters, relays, instruments, resistors, generators, motors, lighting fixtures, storage battery charging equipment, electric cranes, electric hoists and similar equipment, utilization equipment, signaling systems, alarm systems, remote control systems, local loud speaker and communication systems, ventilation piping, live parts, lightning surge protection, and grounding. Electrical equipment can and does cause fires and/or explosions in certain atmospheres. 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. Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). The last condition for an explosion is the presence of an effective ignition source in the direct contact with the fuel/air mixture. Class I: hazardous because flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures: . However, at low ambient temperatures, flammable concentrations of vapors may not exist in a location classified Class I, Zone 0, 1, or 2 at normal ambient temperature. For example, a socket outlet labeled EEx'de' might have a case made to EEx 'e' and switches that are made to EEx 'd'. When working in or specifying equipment for use in hazardous environments, we see a lot of confusion in the industry regarding the different certifications and requirements. 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 In order to understand hazardous area classification it is important to understand which factors contribute to the occurrence of an explosion. Controls can be fitted to detect dangerous concentrations of hazardous gas, or failure of countermeasures. 41 gas explosions per year occur within the UK and app. 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] 1994-2020, W.W. Grainger, Inc. All Rights Reserved. Type of protection "n" is further subdivided into nA, nC, and nR. ESS Container 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). December 2022 Zone 0 describes an area in which a combustible gas will be present continuously while zone 20 describes an area in which combustible dust will be present continuously (the '2' in 'zone 20' indicates dust as opposed to gas). 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. Several protection strategies exist. The a subdivisions have the most stringent safety requirements, taking into account more than one independent component faults simultaneously. As to the classification, they are the same. If equipment is marked, for example, Ex e II T4 then it is suitable for all subgroups IIA, IIB and IIC. February 2022 September 2018 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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