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1: Normal operation is considered the situation when plant, Informational Note No. For dusts: Zone 20, Zone 21 and Zone 22. Temperature classification, except for intrinsically safe apparatus. In general, all types of equipment installed within the hazardous area shall be . The part codes for each SPARTAN variant also differ depending on the level of protection required. A: Yes. Methane has a LEL of 4,4 vol%. This was accompanied by electrically-initiated explosions of flammable gas such as fire damp (methane) and suspended coal dust. November 2021 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. This temperature is used for classification for industry and technology applications.[6]. 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. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). This equipment is intended for use in Zone 1 (gases) or Zone 21 (dusts). 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). The Zone system has wider use in the chemical and petrochemical industries. 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. In Europe the ATEX 114 Directive (2014/34/EU) is applicable to equipment that is used in hazardous area's. Zone 1 . The temperature marking may not exceed the ignition temperature of the specific gas or vapor to be encountered. Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and do so only for a short period of time. Zone 22 Zone 21 Zone20 A hazardous atmosphere formed by dust cloud in air is not likely to occur in . A differentiation is made between gas Ex zones and dust Ex zones: Gas Ex zones are 0/1/2 and dust Ex zones are 20/21/22. Groups A, B, C, and D are for gases (Class I only). . 29 CFR 1910.399 Definitions Applicable to Subpart S CUTTING SKIPS The zone classification for gases is divided into three zones, namely Zone 0, Zone 1 and Zone 2 and for dusts Zone 20, Zone 21 and Zone 22. Magnesium, Titanium), IIB Nonconductive dusts (eg. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. taper per foot. Refrigerated 6: For further information on electrical systems for hazardous (classified), Informational Note No. 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] Get more great content like this sent to your inbox. 2: Where gas detection, Informational Note No. A Zone 0 location is a location in which one of the following . Hazardous Environment Classifications: NEC vs IEC, IEC (International Electrotechnical Commission), Group E Metal dusts (eg. The choice of which standard to use for the hazardous area classification is something which is very important. The Zone Classification System is offered as an alternative to the Class and Division system. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). A: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. This article covers the requirements for the, Informational Note No. July 2021 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. A light switch may cause a small, harmless spark when switched on or off. The term equipment is applied both for fixed equipment and mobile equipment that are operated in such area. Refrigerated Container These applications will - due to browser restrictions - send data between your browser and our server. Dn 1 - a Ce e . Recommendat ions. As world trade becomes more globalized, international standards are slowly converging, so that a wider range of acceptable techniques can be approved by national regulatory agencies. Container Standards Equipment marked as suitable for Group IIC is also suitable for IIB and IIA. Division II Comprising of Area Same as Zone 2. We don't collect information from our users. Equipment used in hazardous area must comply to certain Ex standards. An explosion is a rapid expansion in volume associated with an extremely vigorous outward release of energy, usually with the generation of high temperatures and release of high-pressure gases (wikipedia (https://en.wikipedia.org/wiki/Explosion). A room with a propane gas installation will typically be classified with the. A spark or high heat must also be present. A potential few examples of this are: The air space inside a tank of petrol 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. 0,1 or 2: II B: I: 1 or 2: C: Acetone Benzene Butane Hexane . No long-term contract. It is obvious to use those standards within these industries. 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. In this system, two bare wires were run along the length of a drift, and any miner desiring to signal the surface would momentarily touch the wires to each other or bridge the wires with a metal tool. Each chemical gas or vapour used in industry is classified into a gas group. Offshore Workshop Container 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. A: No. Gas a. [4], Flammability of combustible liquids are defined by their flash-point. September 2020 December 2013, All Atmosphere containing flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a MESG value greater than 0.75 mm or a MIC ratio greater than 0.80 - such as gasoline, acetone, ammonia, benzene, butane, ethanol, hexane, methanol, methane, vinyl chloride, natural gas, naphtha, propane or gases of equivalent hazard. September 2021 Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. January 2023 Ways to ensure this level of safety are non-arcing design and limitation of the temperature of the equipment. May 2021 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). according to ISO standard 80079 series. 286 natural gas explosions per year in the U.S. causing substantial damage, severe injury or loss of lives. Area's are divided into zones. The autoignition temperature is the lowest temperature at which the substance will ignite without an additional heat or ignition source (at atmospheric pressure). 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. The last condition for an explosion is the presence of an effective ignition source in the direct contact with the fuel/air mixture. 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. Area Classification. 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. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. 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. 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. Hazardous Area Classification is a study, in which is assessed, at witch locations of a plant, factory or company, high concentrations of flammable gases are present or can be released, in order to create an explosion hazard. >> NEC: Class I, Division 2, Group D. | IEC: Zone 2, Group II. This is presented by the Lower Explosion Limit (LEL) of a substance. To prevent explosions from happening in harsh environments whereby flammable gases or combustible dusts are present directives and guidelines are put in place to protect both the public, workforce, and environment. Flour, wood/sawdust, plastic dust), IIC Conductive dusts (eg. 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 in which an explosive gas atmosphere is likely to occur occasionally in normal operation. It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . For non-ambient conditions, like process reactors or other enclosed systems, the Limiting Oxygen Concentration is often used for the prevention of explosive atmospheres within those enclosed areas. Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. Different countries have approached the standardization and testing of equipment for hazardous areas in different ways. Other ignition sources can also be present, like static electricity. (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. 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. Zone 0, 1 2 . Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). This classification method provides a description of the hazardous material that may be present, and the probability that it is present, so that the appropriate equipment may be selected, and safe installation practices followed. For equipment provided with threaded entries for NPT threaded conduit or fittings, listed conduit, conduit fittings, or cable fittings shall be used. This has been replaced by a European numerical system, as set out in directive 1999/92/EU implemented in the UK as the Dangerous Substances and Explosives Atmospheres Regulations 2002. Hazardous areas are those defined as areas of potential explosion risk due to the presence of flammable gas or vapor. Note to paragraph (g)(4) of this section: Low ambient conditions require special consideration. 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. In 29 CFR 1910.307(c)(2)(ii), OSHA requires all equipment used in a hazardous location to be marked with the class, group and operating temperature or temperature range for which it is approved. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. coal and charcoal), Group G Nonconductive dusts (eg. eg Production Area, area surrounding zone 0. 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. 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. No. There are several ways of how to perform hazardous area classification, all described in several standards or codes of practise. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. The flash-point is the temperature at which the material will generate sufficient quantity of vapor to form an ignitable mixture. Explosion-proofing designs equipment to contain ignition hazards, prevent entry of hazardous substances, and, contain any fire or explosion that could occur. The four steps involved in hazardous area classification are: Determine the type of hazard or "class" that might be presentcombustible gas (Class I), combustible dust (Class II), or fibers (Class III). Explosions can cause significant damage along with severe injury or worse loss of life. Directly adjacent on the label one will find the mark of the listing agency. Zone 2: An area in which an explosive atmosphere is not likely to occur in normal operation, but if it does . The a subdivisions have the most stringent safety requirements, taking into account more than one independent component faults simultaneously. So it is quite obvious that explosions should be prevented as much as possible and still work has to be done to achieve this. Quick Tips #124.1. Arcing electrical equipment in unclassified . So the following conditions must be met for an explosion to occur: Represented by the following explosion triangle. These areas are in North America (United States and Canada) historically classified with the Class/Division system. October 2021 [1] NEC article 500 describes the NEC Division classification system, while articles 505 and 506 describe the NEC Zone classification system. Analysers, motors, control boxes, computers, Any arcs or sparks in this equipment has insufficient energy (heat) to ignite a vapour. 2: For Group IIIC combustible dusts or metal combustible fibers/flyings, there shall only be Zone 20 or 21 locations. Fundamentally, for an explosion to take place, flammable or explosive gases, vapours, mists or dusts will be present. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. Gases, Vapors and Mists. . What Are All Those Gadgets On A Multitool? Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. These are typically process areas where gases are more likely to be present. BATTERY ENERGY STORAGE SYSTEMBESS) The value is represented is volume percentage of oxygen. 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.