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NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. This equipment is intended for use in Zone 1 (gases) or Zone 21 (dusts). 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. lk) are places where fire or explosion hazards may exist. coal and charcoal), Group G Nonconductive dusts (eg. The escaping (hot) gases must sufficiently cool down along the escape path that by the time they reach the outside of the enclosure not to be a source of ignition of the outside, potentially ignitable surroundings. Comparisons between the two systems are not easily accomplished. Equipment marked as suitable for Group IIC is also suitable for IIB and IIA. Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation occasionally No. Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. Feedback From Clients Marking "EEx d" in Accordance with EN 50 0 14 and 50 018 . September 2019 Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). 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. Hazardous area classification is a rigorous method of determining where an explosive environment may be present. Arc-producing elements can be isolated from the atmosphere, by encapsulation in, Heat-producing elements can be designed to limit their maximum temperature below the. Class 1/Div 2 ATEX Zone 2 Computers. BATTERY ENERGY STORAGE SYSTEMBESS) The required protection level is linked to the intended use in the zones described below: The equipment category indicates the level of protection offered by the equipment. Conversely if the same material is heated and handled above its flash-point, the area must be classified for proper electrical system design, as it will then form an ignitable mixture.[5]. 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. 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. 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. THE CURRENT STANDARD . Typical gas hazards are from hydrocarbon compounds, but hydrogen and ammonia are also common industrial gases that are flammable. SEWAGE TREATMENT These generally give rise to areas classied as Zones 0, 1, and 2 respectively. ". To minimize the risk of these fires or explosions, electrical/electronic equipment must be designed, tested and labeled as being acceptable for use in the areas in which it is installed. Classification of locations, testing and listing of equipment, and inspection of installation, is typically overseen by governmental bodies. [3], Different explosive atmospheres have chemical properties that affect the likelihood and severity of an explosion. All areas in the facility that are not Zone 0, Zone 1, or Zone 2 are considered unclassified. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. August 2022 For example, in the US by the Occupational Safety and Health Administration. Within a working area or installation an ignition can be created by many factors. 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. Several protection strategies exist. ethanol, methane or hydrogen. 1.1 Scope. Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as shown in the illustration below. ADNOC Equipment used in hazardous area must comply to certain Ex standards. Zone 1 . Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. February 2023 When equipment must be placed in a hazardous location, it can be designed to reduce the risk of fire or explosion. Figures show that appr. The key difference between Divisions and Zones relate to terminations. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). 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. 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. Classification of Hazardous Areas 0 100 200 300 400 500 600 T1 >450C T2 >300C 450C T3 >200C 300C T4 >135C 200C . 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." The label will always list the class, division and may list the group and temperature code. The relation between that system and de zone classification system is clarified within the following table (only for gases and liquids are displayed, not for dusts and fibers). API 500/505 mostly for onshore and offshore oil and gas applications. 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. Fundamentally, for an explosion to take place, flammable or explosive gases, vapours, mists or dusts will be present. 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). [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. All rights reserved. 11: For information on electric skin effect trace heating for hazardous (classified), Informational Note No. The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. A spark or high heat must also be present. January 2022 In Europe the label must show the CE mark and the code number of the certifying/notified body). Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. Electrical equipment can and does cause fires and/or explosions in certain atmospheres. 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". >> For Gas Vapor this would be Zone 1. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. These would be then labeled with each of the individual methods. 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 All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides -in. It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . Class II combustible dusts are grouped into one of three (3) groups: E combustible metal dusts, F combustible carbonaceous dusts or G other combustible dusts. | For Gas/Vapor this would be Zone 0. according to ISO standard 80079 series. 2) MIC (Minimum Igniting Current) Ratio - The ratio of the minimum current required from an inductive spark discharge to ignite the most easily ignitable mixture of a gas or vapor, divided by the minimum current required from an inductive spark discharge to ignite methane under the same test conditions. Zone 1 if gas group & temp. Comparison of Zones and Divisions. When the concentration of methane is beneath the LEL, an explosion cannot occur, even when an ignition source is present. Coal mines, grain mills, elevators, and similar facilities likewise present the risk of a clouds of dust. September 2018 Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. Locations are thus classified by type and risk of release of gas, vapor, or dust. Zone 0, 1, and 2 locations are those in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitible mixtures. See Figure S-1 for an explanation of this marking. Atmosphere containing a flammable gas, a flammable liquid produced vapor or a combustible liquid-produced vapor whose MESG is greater than 0.75 mm or MIC ratio is greater than 0.40 and less than 0.80 - such as carbon monoxide, ether, hydrogen sulfide, morphline, cyclopropane, ethyl, isoprene, acetaldhyde and ethylene or gases of equivalent hazard. As a guide for Zone 0, this can be defined as over 1,000 hours/year or >10% of the time. Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. 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. All emergency versions, whether Zone 1 or Zone 2 can also be easily visually identified by their red end cap, encapsulating the emergency battery back-up. Container Accessories Zone Hazardous Location 2 Table of . Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. >> NEC: Class I, Division 2, Group D. | IEC: Zone 2, Group II. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. ), Group F Carbon-based (eg. How to perform Hazardous Area Classification? It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . A room with a propane gas installation will typically be classified with the. June 2020 Zone defines the general nature - if it is a gas or dust - and the probability of hazardous material being present in an ignitable concentration in the surrounding atmosphere. Readers with specific questions should refer to the applicable standards or consult with an attorney. Temporary Refuge Hazards in this group gas can be ignited very easily indeed. In other cases, the atmosphere is normally non-hazardous, but a dangerous concentration can be reasonably foreseensuch as operator error or equipment failure. |MWD/LWD Cabin Sources of MCC Shelter Temperature Control 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. Equipment construction is such that it can withstand an internal explosion and provide relief of the external pressure via flamegap(s) such as the labyrinth created by threaded fittings or machined flanges. The IEC 60079 standard set has been adapted for use in Australia and New Zealand and is published as the AS/NZS 60079 standard set. Zone 0 - Explosive atmospheres present continuously long periods or frequently. 1910.307 (g) (2) 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. Although every application is different, for the ease of monitoring and specification each hazardous area is classified as a particular level or zone. Group is divided in three groups where Group I is reserved for mining locations. Hazardous Environment Classifications: NEC vs IEC, IEC (International Electrotechnical Commission), Group E Metal dusts (eg. . The conduit shall be made wrench tight to prevent sparking when fault current flows through the conduit system and to ensure the explosionproof or flameproof integrity of the conduit system where applicable. December 2022 41 gas explosions per year occur within the UK and app. 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. . 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. WATER TIGHTNESS Some of our calculators and applications let you save application data to your local computer. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. 1.1.2 This recommended practice provides information on specific flammable gases and vapors, flammable liquids . 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. This rapid expansion of volume is caused by the combustion of a fuel, like e.g. What Are All Those Gadgets On A Multitool? The International Electrotechnical Commission publishes the 60079 series of standards[2] which defines a system for classification of locations, as well as categorizing and testing of equipment designed for use in hazardous locations, known as "Ex equipment". NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. The design of the equipment must ensure protection, even in the event of rare incidents relating to the equipment. A high level of protection is ensured. Horizontal. Exception No. Zone 0: flammable atmosphere highly likely to be present - may be present for long periods or even continuously . Different countries have approached the standardization and testing of equipment for hazardous areas in different ways. area in which an explosive gas atmosphere is present continuously, or for long periods, or frequently (more than 10% of the time). Youre phone isnt rated for use in hazardous areas. Powder Filling "q" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Zone 1 an area in which an explosive gas-air mixture is likely to occur in normal operating conditions. For more detailed assessments or for situations where no specific industry standards are available , like the chemical or pharmaceutical sector and also specific installation for oil and gas industries, a more quantitative approach can be used. AddThis use cookies for handling links to social media. And safety must be guaranteed in the case of two faults occurring independently of each other. Dn 2 - a Ce d e r . 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. Independent test housesNotified Bodiesare established in most European countries, and a certificate from any of these will be accepted across the EU. Temporary Refuge (TR) Shelter These generally give rise to areas classied as Zones 0, 1, and 2 respectively. 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. Gas a. 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 Area classification documentations are reviewed and updated to reflect process changes. At least two British mine explosions were attributed to an electric bell signal system. NFPA 70 NEC Classes, Divisions and Groups. Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. For explosion hazards caused by flammable liquids or gases, the following zones are defined: So a zone 0 is the most hazardous zone and a zone 2 is a less hazardous zone. The use of EPL and ATEX Category directly is an alternative for "s" marking. 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] August 2018 SIGN UP FOR EMAILGet more great content in your inbox. If equipment is marked, for example, Ex e II T4 then it is suitable for all subgroups IIA, IIB and IIC. Groups E, F, and G are for dusts and flyings (Class II or III). Some other standards have more quantitative methods which require more knowledge of the plant, an example is the IEC standard 60079-10-1. Magnesium, Aluminum, Titanium etc. National Electric Code 2020 edition National Fire Protection Association. Hazardous areas are those defined as areas of potential explosion risk due to the presence of flammable gas or vapor. We will go deeper into ignition assessments in another blog. Methane has a LEL of 4,4 vol%. 3: Text that is followed by a reference in brackets has been extracted from NFPA 497-2017, All other applicable rules contained in this, Where the term "Class I" is used with respect to, Informational Note: The term "Class I" was originally included as a prefix to, All areas in industrial occupancies designated as hazardous (classified). In Northerm America, instead of the zone classification system, the Class/Division system is used. No long-term contract. 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). Type of protection "n" is further subdivided into nA, nC, and nR. 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 specific industries, the specific codes for that industry are important to use. Recommendat ions. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. October 2018 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. 3: For further information on the classification of, Informational Note No. Equipment marked as suitable for IIB is also suitable for IIA but NOT for IIC. Enclosures can be pressurized with clean air or inert gas, displacing any hazardous substance. Every substance has a differing combination of properties but it is found that they can be ranked into similar ranges, simplifying the selection of equipment for hazardous 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. 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 . A Zone 1 hazardous area is classified as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. 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. Table 1. February 2021 Lets take a look at what defines each zone. 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. Arcing electrical equipment in unclassified . November 2021 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. Division defines the probability of the hazardous material being present in an ignitable concentration in the surrounding atmosphere. Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. Zone 0 Zone 1 Zone 2 Fluid Occurrence of explosive atmosphere Gas mixtures Dust mixtures Not likely to occur or only for short period Zone 2 Zone 22 . the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). October 2022 The basis for the classification into zones is the duration of the presence of the potentially explosive atmosphere: The longer it is present, the more critical the zone.