HAZARDOUS VS. CUTTING SKIPS . As to the classification, they are the same. June 2019 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. National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. Lets take a look at what defines each zone. 11: For information on electric skin effect trace heating for hazardous (classified), Informational Note No. d : HA - ha ea OA - oa Area classification - Divisions vs. zones Continuous hazard Intermittent hazard Hazard under abnormal conditions Zone 0 Zone 1 Zone 2 Division 1 Division 1 Division 2 Hazardous locations - CEC classifications Class I December 2021 Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). 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. 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. 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. 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 Analysers, motors, control boxes, computers, Any arcs or sparks in this equipment has insufficient energy (heat) to ignite a vapour. 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. But when we take a closer look at the graph and table, we can conclude that any explosion, can easily lead to severe damage. Explosion protection must be ensured during normal operation. SEWAGE TREATMENT Hazardous Area Classification, Gas Vapours and Dust Groups, Temperature Class | Simple Science Simple Science 8.81K subscribers Join Subscribe 28K views 2 years ago This video explains. AddThis use cookies for handling links to social media. Zone 1 (unless separated by a fire wall)P.G.Sreejith, Kerala. Atmospheres containing non-conductive dust. *unless risk assessment states a higher or lower category is required. 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. Directly adjacent on the label one will find the mark of the listing agency. 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. 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. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. 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. IECEx Karandikar Certification Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! FREEZER February 2021 POSITIVE PRESSURE Category 3 equipment may only be used in zone 2 areas. Area classification is not simply intended to identify hazardous areas on process plants where design has already been completed using only operational and economic factors as influence,. Comparison of Zones and Divisions. Groups E, F, and G are for dusts and flyings (Class II or III). Several protection strategies exist. 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). Groups A, B, C, and D are for gases (Class I only). Class I hazardous locations are identified by zones as follows: * Zone 0 a location in which explosive gas atmospheres are present continuously or for long periods of time. When equipment must be placed in a hazardous location, it can be designed to reduce the risk of fire or explosion. may exist under normal or abnormal conditions because of the presence of flammable gases or vapors, combustible dusts or ignitable fibers or flyings. 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. In some cases, the hazardous atmosphere is present all the time, or for long periods. This was accompanied by electrically-initiated explosions of flammable gas such as fire damp (methane) and suspended coal dust. In electrical and safety engineering hazardous locations HazLoc pronounced hazlk are places where fire or explosion hazards may exist. Area classification documentations are reviewed and updated to reflect process changes. There are two systems in place, including the traditional North American Division system as well as the alternative Zone system. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. 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). 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. (1) Zone 0. In the US, the independent National Fire Protection Association (NFPA) publishes several relevant standards, and they are often adopted by government agencies. Hazardous areas are those defined as areas of potential explosion risk due to the presence of flammable gas or vapor. 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 defines the type of the hazardous material in the surrounding atmosphere. . eg Production Area, area surrounding zone 0. - Zone 0: An area where an explosive gas-air mixture is continuously present or present for long time (continuous hazard, whose estimated duration is higher than 1000 hours/year) - Zone 1: An area where an explosive gas-air mixture is likely to occur during normal . The Regulations define 3 zones that can exist within a hazardous area: Zone 0 - A place in which an explosive atmosphere is present continuously or for long periods. It is always balancing between not defining such areas too large (with highly costs for prevention of ignition sources) or too small (unsafe situations). The colour of the luminaire body indicates the level of protection. An oversimplification of this example is shown in Table 1. Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. In the United States, the most commonly followed system is the NEC (National Electric Code), while the rest of the world generally follows the IEC (International Electrotechnical Commission). The housing may be strong enough to contain and cool any combustion gases produced internally. Some other standards have more quantitative methods which require more knowledge of the plant, an example is the IEC standard 60079-10-1. This means that the electrical equipment is safe for use within these area by applying special protection strategies. WHEN YOU NEED THEM. Intrinsic safety designs equipment to operate using minimal energy, insufficient to cause ignition. In Europe the ATEX 114 Directive (2014/34/EU) is applicable to equipment that is used in hazardous area's. Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 . October 2021 These applications will - due to browser restrictions - send data between your browser and our server. Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). 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. NEGATIVE PRESSURE You will find this equipment in paint factories, a warehouse or around a bag dump station. July 2020 May 2019 Zones. Australia and New Zealand use the same IEC-60079 standards (adopted as AS/NZS60079), however the CE mark is not required. No long-term contract. International Electrotechnical Committee (IEC) Hazardous Area Classification. Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? | For Gas/Vapor this would be Zone 0. Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. . 2: For Group IIIC combustible dusts or metal combustible fibers/flyings, there shall only be Zone 20 or 21 locations. The Raytec SPARTAN range includes dedicated luminaires for both Zone 1 and Zone 2 areas as well as industrial applications. Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). Beside the Lower Explosion Limit, each substance also has an Upper Explosion Limit (UEL). Zones 0, 1 and 2: Atmospheres with explosive gases and vapours (AS2380; AS/NZS/IEC 60079) Zone 0 Area The definition according to IEC60079-10-1 is "an area in which an explosive gas atmosphere is present continuously or for long periods or frequently". Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. Equipment is placed into protection level categories according to manufacture method and suitability for different situations. . . This is an important factor in the classification of hazardous areas. Iso Container No other aspect of safety receives more attention in the form of codes and standards. 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. Zone 1 . October 2022 The process of determining the type and size of hazardous locations is called classification. This rapid expansion of volume is caused by the combustion of a fuel, like e.g. Sources Zone 1 if gas group & temp. a headlamp, rather than a dedicated fixed luminaire. When the concentration of gas or vapor is above the UEL the gas mixture is too rich to burn. . TLS OFFSHORE CONTAINER So it is quite obvious that explosions should be prevented as much as possible and still work has to be done to achieve this. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. Under the "Zone" system, hazards are defined for gas as Zone 0, 1 or 2, with 0 as the highest hazard, and for dust as Zone 20, 21 or 22, with 20 as the . Zone 1 an area in which an explosive gas-air mixture is likely to occur in normal operating conditions. Methane has a LEL of 4,4 vol%. Independent test housesNotified Bodiesare established in most European countries, and a certificate from any of these will be accepted across the EU. Offshore Accommodation Module December 2022 Dn 2 - a Ce d e r . Temporary Refuge Container Standards Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. 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. Non-hazardous or ordinary locations. Recommendat ions. 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". It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . The Zone Classification System is offered as an alternative to the Class and Division system. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . 1: The term "Class I" was originally included as a prefix to, Informational Note No. November 2021 Zone Hazardous Location 2 Table of . No hidden fees. So yes, it is important to choose the right model and always wonder what am I assessing?. | For Dust this would be Zone 22. ". The Zone system has three levels of hazard for gas or dust. 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. The definition of 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 short period only. March 2022 Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. June 2020 Is intended for us in Zone 2 (gases) or Zone 22 (dusts). 7: For further information on application of electrical, Informational Note No. Note to paragraph (c)(3) of this section: The National Electrical Code, NFPA 70, contains guidelines for determining the type and design of equipment and installations that will meet this requirement.