If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. 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. SPARTANs Zone 1 part code begins SPX, Zone 2 SPZ and industrial products having a SPI prefix. Industrial electrical equipment for hazardous area has to conform to appropriate parts of standard: IEC-60079 for gas hazards, and IEC-61241 for dust hazards. 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. . There are four zones in the IEC classification system: Zone 0: An area in which an explosive atmosphere is present continuously or for long periods. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. CLASSIFIED LOCATIONS: AREA CLASSIFICATION: AREA CLASSES: AREA GROUPS: LOCATION AS PER DIVISIONS: DIVISION 1 - Class I, Division 1 hazardous locations are defined (as per NEC code Article 500) as follows: DIVISION 2 - Class I Division 2 Locations are as follows: Area Classification by ZONES: DEFINITIONS: HAZARDOUS LOCATIONS: Also included in the marking are the manufacturers name or trademark and address, the apparatus type, name and serial number, year of manufacture and any special conditions of use. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. Temporary Refuge Much early equipment having Ex s protection was designed with encapsulation and this has now been incorporated into IEC 60079-18 [Ex m]. 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. Area ClassificationThe max surface temp. The above groups are formed in order of how explosive the material would be if it was ignited, with IIC being the most explosive zone system gas group and IIA being the least. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. 0. A material may have a relatively low autoignition temperature yet if its flash-point is above the ambient temperature, then the area may not need to be classified. 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. Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. 1: For examples of area classification drawings, see ANSI/API RP 505-2018, Informational Note No. These are typically process areas where gases are more likely to be present. Equipment can be designed or modified for safe operation in hazardous locations. MCC Shelter to EN 1127-1): After the hazard area classification is completed, then the ignition assessment starts. You will find this equipment in paint factories, a warehouse or around a bag dump station. API 500/505 mostly for onshore and offshore oil and gas applications. 15 4. Is intended for us in Zone 2 (gases) or Zone 22 (dusts). 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. Dn 1 - a Ce e . 1910.307 - Hazardous (classified) locations. Many people have heard terms like Class I, Division 2, Group E, or ATEX zone 21 but many of our customers only know what certification they require with little understanding of what they mean, so we thought it would be appropriate to write a blog post to help customers understand the broader implications of these terms. Zone 0 - Explosive atmospheres present continuously long periods or frequently. Enclosures can be pressurized with clean air or inert gas, displacing any hazardous substance. A potential few examples of this are: The air space inside a tank of petrol 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. 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. In effect it is any method which can be shown to have the required degree of safety in use. Refer to Fig.3 which shows the hazardous area zone classification based on hazardous gas release grade. An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. Laboratory Container IEC 60079-10.1 Classification of areas - Explosive gas atmospheres. Independent test housesNotified Bodiesare established in most European countries, and a certificate from any of these will be accepted across the EU. Some manufacturers claim "suitability" or "built-to" hazardous areas in their technical literature, but in effect lack the testing agency's certification and thus unacceptable for the AHJ (Authority Having Jurisdiction) to permit operation of the electrical installation/system. The last requirement for the explosion is the presence of an ignition source, like a spark or hot surface. In the United Kingdom, Sira and Baseefa are the most well known such bodies. 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. National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. 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. 1: The term "Class I" was originally included as a prefix to, Informational Note No. 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]. (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. July 2021 the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). . Gases, Vapors and Mists. Informational Note No. But first, we must consider what is likely to cause an explosion in the first place. What is an Explosion Protection Document? coal and charcoal), Group G Nonconductive dusts (eg. . Controls can be fitted to detect dangerous concentrations of hazardous gas, or failure of countermeasures. Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. . 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. Arcing electrical equipment in unclassified . 1. For example, a Class 1, Div 1 area where Group A may be present would be defined as an area where flammable gases or vapors may be present under normal operating conditions. 41 gas explosions per year occur within the UK and app. 1910.307 (g) (2) 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. 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). Group is divided in three groups where Group I is reserved for mining locations. In Northerm America, instead of the zone classification system, the Class/Division system is used. Unlike ATEX which uses numbers to define the safety "Category" of equipment, namely (1,2 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since 2009. Ambient Temperature (-20C to +40C if not marked) Establish Zone Based on "IEC 60079-10". The Zone Classification System is offered as an alternative to the Class and Division system. But beside electrical equipment also mechanical equipment must be Ex certified, e.g. No representation is made that the information or references are complete or remain current. Class I: hazardous because flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures: . IECEx Karandikar Certification The a subdivisions have the most stringent safety requirements, taking into account more than one independent component faults simultaneously. When the concentration of gas or vapor is above the UEL the gas mixture is too rich to burn. Equipment shall be marked to show the class, group, and operating temperature or temperature range, based on operation in a 40-degree C ambient, for which it is approved. 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. Standards and regulations exist to identify such locations, classify the hazards, and design equipment for safe use in such locations. A light switch may cause a small, harmless spark when switched on or off. Other ignition sources can also be present, like static electricity. Feedback From Clients >> NEC: Class II, Division 1, Group F. | IEC: Zone 20, Group IIC. No long-term contract. Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: Zone 0: An area in which an. Division II Comprising of Area Same as Zone 2. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. The substance referred to by classhas a low probability of producing an explosive or ignitable mixture and is present only during abnormal conditions for a short period of time - such as a container failure or system breakdown. A: Yes. It may exist because of repair, maintenance operations, or leakage. according to ISO standard 80079 series. WHEN YOU NEED THEM. 2: This classification usually includes, (B) Special Occupancies, Zone 0, 1, and 2 Locations, Article 505 Special Occupancies, Zone 0, 1, and 2 Locations, (B) Special Occupancies, Class I, Zone 0, 1, and 2 Locations, National Electrical Code 2020 of Illinois, National Electrical Code 2017 of Illinois, Ignitible concentrations of flammable gases or vapors are present continuously, Ignitible concentrations of flammable gases or vapors are present for long periods of time, In which ignitible concentrations of flammable gases or vapors are likely to exist under normal operating conditions; or, In which ignitible concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage; or, In which ignitible concentrations of flammable gases or vapors are not likely to occur in normal operation and, if they do occur, will exist only for a short period; or, In which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used but in which the liquids, gases, or vapors normally are confined within closed containers of closed systems from which they can escape, only as a result of accidental rupture or breakdown of the containers or system, or as a result of the abnormal operation of the, In which ignitible concentrations of flammable gases or vapors normally are prevented by positive mechanical ventilation but which may become hazardous as a result of failure or abnormal operation of the ventilation. | For Gas/Vapor this would be Zone 0. 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. 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. 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] Canada has a similar system with CSA Group standard C22.1, the Canadian Electrical Code, which defines area classification and installation principles. As a result, all hazardous area equipment must be designed with hazardous area zone classifications in mind, as the zone governs the level of protection and precaution required. Ignition sources can be divided in 13 categories (acc. Both external and internal temperatures are taken into consideration. All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides -in. This page was last edited on 20 January 2023, at 22:32. National Electric Code 2020 edition National Fire Protection Association. Often an area classification plan view is provided to identify equipment ratings and installation techniques to be used for each classified area. 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). 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). Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. Some of our calculators and applications let you save application data to your local computer. 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. 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. 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. 0,1 or 2: II B: I: 1 or 2: C: Acetone Benzene Butane Hexane . It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. As a guide for Zone 0, this can be defined as over 1000 hours/year or >10% of the time. NEW METHODS FOR HAZARDOUS AREA CLASSIFICATION FOR EXPLOSIVE GAS . The inductance of the signal bell coils, combined with breaking of contacts by exposed metal surfaces, resulted in sparks, causing an explosion. 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. December 2013, All These areas only become hazardous in case of an accident or some unusual operating condition. What are 'Dark Factories,' and Do They Really Exist? These areas only become hazardous in case of an accident or some unusual operating condition. 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.
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