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These generally give rise to areas classied as Zones 0, 1, and 2 respectively. TLS OFFSHORE CONTAINER Area's are divided into zones. Therefor Hazardous Area Classification (HAC) is the first important step in achieving an explosion safe installation or work environment. This article covers the requirements for the, Informational Note No. Feedback From Clients Equipment is non-incendive or non-sparking. - 1 2 (Class 1, . It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . Zones compares to classes and divisions in the Class/Division system. coal and charcoal), Group G Nonconductive dusts (eg. If you require more information on the different variants in the SPARTAN range, or you would like to discuss your application in more detail, you can call us on +44 (0) 1670 520055 or send an email to sales@raytecled.comwhere we will happily answer any questions you have. In instances of areas within the same facility classified separately, Class I, Zone 2 locations may abut, but not overlap, Class I, Division 2 locations. area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. Typical gas hazards are from hydrocarbon compounds, but hydrogen and ammonia are also common industrial gases that are flammable. In the US, the National Electrical Manufacturers Association (NEMA) defines standards for enclosure types for a variety of applications. Explosion protection must be ensured during normal operation. 6: For further information on electrical systems for hazardous (classified), Informational Note No. Readers with specific questions should refer to the applicable standards or consult with an attorney. (1) Zone 0. January 2022 WELDING INSPECTION . There are three zones for gas: Zone 0, Zone 1 and Zone 2. See Figure S-1 for an explanation of this marking. Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. The colour of the luminaire body indicates the level of protection. Informational Note No. 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. Informational Note No. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. ignitable concentrations of dust, fibers, or flyings are present for long periods of time, ignitable concentrations of dust, fibers, or flyings are likely to exist under normal conditions, ignitable concentrations of dust, fibers, or flyings unlikely to exist under normal conditions, Metal dusts, such as magnesium (Division 1 only), Carbonaceous dusts, such as carbon & charcoal, Non-conductive dusts, such as flour, grain, wood & plastic, Ignitible fibers/flyings, such as cotton lint, flax & rayon, Ignitible fibers or flyings, such as cotton lint, flax & rayon. Area's are divided into zones. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. This means that the electrical equipment is safe for use within these area by applying special protection strategies. the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). Equipment that is listed for a Zone 0 location may be installed in a Zone 1 or Zone 2 location of the same gas or vapor. May 2019 FREEZER Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. . Substance properties are specific for the amount of fuel needed to get an explosion when all other conditions are met. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Zone type (0/1/2/ 20/21/ 22) Zone extent. The American Petroleum Institute publishes analogous standards in RP500 andRP505. A high level of protection is ensured. Which system is preferred depends on the users preference, how the areas are classified, and the wiring system used. The Zone system for classifying hazardous locations used in NFPA 70 NEC, IEC 60079, and the Canadian Electrical Code indicates the level of probability that a flammable concentration of a hazardous substance may be present. NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. NEGATIVE PRESSURE 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. 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). Non-hazardous or ordinary locations. This is presented by the Lower Explosion Limit (LEL) of a substance. The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. hazardous areas as the following: An area where a potential hazard (e.g., a fire, an explosion, etc.) Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). lk) are places where fire or explosion hazards may exist. 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. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. But when we take a closer look at the graph and table, we can conclude that any explosion, can easily lead to severe damage. SEWAGE TREATMENT These applications will - due to browser restrictions - send data between your browser and our server. Specific types of protection being used will also be marked. 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. Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. 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. National Electric Code 2020 edition National Fire Protection Association. Other ignition sources can also be present, like static electricity. 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." [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. November 2020 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. 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. There are two systems in place, including the traditional North American Division system as well as the alternative Zone system. 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. *unless risk assessment states a higher or lower category is required. Group is divided in three groups where Group I is reserved for mining locations. THE PRODUCTS YOU NEED, Zone 2 - Explosive atmospheres are unlikely to occur or present only infrequently and for a short period only. Container Accessories But beside electrical equipment also mechanical equipment must be Ex certified, e.g. [12], International Electrotechnical Commission, Occupational Safety and Health Administration, National Electrical Manufacturers Association, "Hazardous Area Classification and Control of Ignition Sources", "Hazardous (Classified) Locations NEC Articles 500 through 517", https://en.wikipedia.org/w/index.php?title=Electrical_equipment_in_hazardous_areas&oldid=1134828101, ignitable concentrations of combustible dust can exist, under normal conditions, ignitable concentrations of combustible dust are unlikely to exist normally, ignitable fibers, or materials producing combustible flyings, are handled, manufactured or used, easily ignitable fibers are stored or handled. 2: For the requirements for electrical and electronic. What is an Explosion Protection Document? 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). Class I Zone 2 Hazardous Areas. a headlamp, rather than a dedicated fixed luminaire. Horizontal. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). area in which an explosive gas atmosphere is not likely to occur in normal operation, but, if it does occur, will exist for a short period only (less than 0,1% of the time), Window breakage, cracks plaster, light damage to buildings, Collapse of wood or asbestos siding of homes, Collapse of walls made of concrete blocks, Reinforced concrete structures severely damaged, Flames and hot gases (including hot particles), Mechanically generated impact, friction and abrasion, Stray electric currents, cathodic corrosion protection, Radio frequency (RF) electromagnetic waves from 10, Exothermic reactions, including self-ignition of dusts, EI 15 Energy Institute 15, mostly for on- and offshore oil and gas applications. 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. Division 1 and 2 Zone 0, 1 and 2 A (acetylene) IIC (acetylene & hydrogen) B (hydrogen) C (ethylene) IIB (ethylene) You can target the Engineering ToolBox by using AdWords Managed Placements. Gas a. NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. Also known as non-hazardous or ordinary locations, these locations are determined to be neither Class I, Division 1 or Division 2; Zone 0, Zone 1 or Zone 2; or any combination thereof. WHEN YOU NEED THEM. Copryright 2023 Springer Controls Company . Class defines the type of explosive or ignitable substances which are present in the atmosphere. The key difference between Divisions and Zones relate to terminations. Hazardous areas are those defined as areas of potential explosion risk due to the presence of flammable gas or vapor. It is essential to know which zone you are working in, so that you can specify the most appropriate equipment. In general, all types of equipment installed within the hazardous area shall be . 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 the following conditions must be met for an explosion to occur: Represented by the following explosion triangle. 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. Such areas include a residence or office where the only risk of a release of explosive or flammable gas would be such things as the propellant in an aerosol spray. The Zone system has three levels of hazard for gas or dust. POSITIVE PRESSURE MCC Shelter Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus.