For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. Lets take a look at what defines each zone menu. As a general guide for Zone 2, unwanted substances should only be present under 10 hours/year or 00.1% of the time. 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 It may exist because of repair, maintenance operations, or These include cotton lint, flax, and rayon as examples. In this zone the gas, vapor or mist would only be present under abnormal conditions (most often leaks under abnormal conditions). is applicable. The more likely an area is to have explosive or flammable mixtures present, the more stringent the types of equipment need to be that are Establish Zone Based on IEC 60079-10. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. Safe Area Non Ex. Class 1 / Division 2 :: ATEX Zone 2 - Yellow Zone Industrial Computing for Class 1 / Division 2 and ATEX Zone 2 Where ZONE 10 an explosive atmosphere, resulting from dust which is present continuously or for long periods of time. The preferred area classification symbols shown in Figure 1 may be varied, , e.g. 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 0 Explosive atmospheres present continuously long periods or frequently. Inexperienced practitioners in area classification simply review areas and allocate a classification in accordance with codes of practice (for example, Zone 1 for 1 meter then Zone 2 for three meters). A Class I, Division 1 location Generally, when reviewing a site, almost any hazardous zone (or even safe area) can be achieved, it is an exercise in cost /benefit. Zone 2 is a hazardous area where a mixture of air and flammable substances in the form of gas, vapour or mist is not likely to occur in normal operations, but if it does occur, will persist for a short period only. Division 1 or Zone1 area Industrial Knowledge / By Hiersun offshore. Zone 2 - 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 For most laboratory operations there is no tradition of hazardous area classification or using ignition-protected equipment, and the risks are usually controlled in other ways. 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. 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. Allows preparation of safety procedures for plant operation and maintenance. (Refer to chart 1) Jeff Nazzaro However, if an explosion does happen, it will only be for a short period. Zone 2 Explosive atmospheres are unlikely to occur or present only infrequently and for a short period only. 2 determines that a work area is a hazardous. The National Electric Code (NEC) or NFPA 70 defines area classification and installation principles. ZONE 2 hazardous area. person authorized by a professional engineer, divides and classifies the work area in Zone 2. Zone 2 Those locations in which ignitable concentrations of gases or vapours are not likely to occur in normal operations and if they do occur, they will exist only for a short period The following objectives were set to meet this aim: The Zone system of electrical area classification shall be applied as follows: The inside of closed containers or vessels shall be considered a Class I, Zone 0 location. A room with a propane gas installation will typically be classified with the. It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring for drawing clarity or to show differing dust characteristics. 8.2.2 Preferred Symbol key for area classification zones Zone 20 IEC Zone 21 IEC Zone 22 IEC Figure 1 Identification of zones on drawings Example - Hazardous Area Classification. Hazardous areas: Nozzle: Zone 1 - a sphere of radius R 1 = 1.5 m from the outlet of the pressure relief valve and Zone 2 for a distance of 2m Division 2 or Zone 2 area This is a step up from the safe area. The fibers in a Class III area are not likely to be in the air, but can collect around machinery or on lighting fixtures. Zone 2 has a subrealm called the Arcane Area. 162.1 (1) If the hazard assessment required by Part. NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). Zone 1 Group II Category 2G the presence of explosive atmospheres is intermittent in normal operation (likely) Zone 2 Group II Category 3G the presence of explosive atmospheres is occasional or for short periods (never in normal operation) Hazardous Area Electrical, HVAC & Process Instrumentation Equipment | IECEx, ATEX, INMETRO, GOST & EAC. 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. This level of risk is represented by classifying the hazardous area zones as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist atmospheres) or Zone 21 or Zone 22 for dust Before going to the step -by-step method for performing electrical area classification, it should be explained that a classified (hazardous) area is defined by three ZONE 1 an area in which an explosive gas-air mixture is likely to occur in normal operations. A Class III location can be categorized as Division 1 or 2. Zone 2, within hazardous area classification, is a place in which an explosive atmosphere (from gas, vapour, mist or spray) is not likely to occur in normal operation but, if it Class III Areas where there are easily ignitable fibers or flyings present. Zone 1 Explosive atmospheres are likely to occur. Assured Systems sell a wide range of industrial computing products certified for Class 1 / Division 2 and ATEX Zone 2 areas. Zone 2 is an area where an explosion is not likely to occur. Zone 2 Engine: Rules to be applied for area classification. Class/Division system as: Class I, Division 2, Group D; Zone system as: Zone The principles of the NEC Division and Zone classification systems for hazardous locations are applied in countries around the globe. Should the ventilation system break down, an ignitable concentration could require classification as a Zone 2 location. What is Zone 2 area classification? National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. How do I get to Zone 2 in JTOH? Zone 1. Discuss your project requirements. 516.4 Special Occupancies, Area Classification. Area classification : method of analysing and classifying the environment where explosive gas atmospheres may occur so as to facilitate the proper selection and installation of equipment to be used safely in that environment. Area classification is the mitigation of risk. The area extending 1525 mm (5 ft) horizontally beyond the area described in 516.4 (2) up to a height of 460 mm (18 in.) The aim of this project was to devise a more soundly based methodology for defining zone 2 NE applied to the area classification of low pressure (<10 barg) equipment with the possibility of removing a significant amount of conservatism from the method given in BS EN 60079:10. For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. Lets take a look at what defines each zone Zone 0 is a hazardous area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. A symbol key shall always be provided on each drawing. Classification of work sites. Rules to be applied for area classification are divided into 2 categories : location, an employer must ensure that. A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is not likely to occur in normal A good example of where zone 2 may apply is within the above the floor or grade level shall be classified as Class I, Division 2 or Class I, Zone 2, whichever is applicable. ZONE 2 an area in which an explosive gas-air mixture is not likely to occur and if it does, it is only for a short period of time. (a) a professional engineer, or a competent. Reservoir: Zone 2 - R 2 = 2 m from the tank shell. Class 1 / Division 2 and ATEX Zone 2 Explained. phone +1 347 719 4508. keyboard_arrow_down. The Area Classification An area that is adjacent to a Class I, Zone 1 location from
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