This makes brushless motors more efficient. Rather, the motor enclosure has been machined to contain the explosion within, and flame paths permit the escape of hot gases but dampen the flames and temperatures to prevent a secondary explosion. If it is present under normal operating circumstances, it is a Division 1 location. 1, Group D & Class II, Group E, F, & G hazardous areas. For applications that require hygienic or sanitized components to withstand high-pressure washdowns, like in the food and beverage, medical or pharmaceutical industries, totally enclosed, non-ventilated (TENV) motors are ideal. Explosion proof is an American Word. This will only need to be done once! Recreation of Table 500.8(D)(2) from the 2014 edition of the NEC. Check out Powder & Bulk Solids Industry Master directory. This is to ensure that the hazardous materials do not spontaneously ignite when it contacts the motor surfaces and enclosure during operation. Explosionproof equipment and wiring shall not be required and shall not be acceptable in Class II locations unless also identified for such locations. Class I materials are flammable gases; Class II materials are pervasive, flammable dusts. The AITs of various Class I and Class II hazardous materials are shown in the table below: To be able to apply an electric motor successfully in a hazardous environment, these motors must possess certain critical characteristics that make them suitable to operate in these environment without creating problems. There are three classes of hazardous locations according to the NEC and CEC: Division describes the condition under which the hazardous material is present in the particular environment. This requirement is traditionally depicted using an explosion pentagon as shown above. Two questions that are frequently asked by facility personnel regarding the choice or appropriateness of a given motor are: Also, the expression explosion proof is associated with Class I equipment while the analogous expression for Class II equipment is dust-ignition proof. The NEC addresses this question, in part, in this excerpt from the 2014 edition:5502.5 Explosionproof Equipment Advances in Industrial Explosion Protection Technologies. Electric motors have innumerable applications. This is your one-stop encyclopedia that has numerous frequently asked questions answered. TEFC motors are more resilient than ODP motors, and they are common in pump, fan, compressor, conveyor and material handling applications. All units are fully assembled when shipped from the factory. The simple, efficient, reliable conversion from electric power to kinetic rotary output is invaluable to modern industry. They can also be used for cooling or drying applications. 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If you have previously used our Shopping Site, you may sign in using youremail address(not username) and your password from our previous website. Informa Markets, a trading division of Informa PLC. This is a question our experts keep getting from time to time. For example, motors for use in group A environment which has acetylene gas require the highest enclosure strength and longest flame paths compared with those used in group D environment with only propane gas. Because a computer controls the motor instead of mechanical brushes, it's more precise. There is no sparking and much less electrical noise. One technique that is routinely used to mitigate the risk of a dust explosion is the removal of potential ignition sources. WorldWide Electric Corporation is a leading manufacturer and importer of electric motors, motor controls and gear reducers, as well as the exclusive master distributor of Hyundai Electrics low-voltage motors. Following the launch of our new website on 9/22,we are asking existing customers to register for this new site. An enclosure protects a motor from contaminants in the environment in which it is operating. The motor selection is based on the environment in which the fan will operate. There are two basic divisions: Division 1 and Division 2 locations. As is apparent from the definition, explosion proof equipment is designed to prevent ignition of a specified gas or vapor and not combustible dusts. The AIT refers to the minimum temperature at which there is sufficient energy for a hazardous material (chemical) to ignite spontaneously in the absence of a spark, flame or other source of ignition. Based on these classifications, Class I, Division 1 motors are built to operate in environments routinely exposed to significant quantities of potentially explosive atmospheric gases or vapors. u m2Lr!r*|^;i7PLojEGcw^40Z!YUiR q"29p.W8 #a}1I1\JAi668DZ B0Lo>D- Identifies the probability of the hazardous material being able to explode or ignite.. An external fan is attached to the shaft to increase circulation and convection rate. Our experts have done a research to get accurate and detailed answers for you. Nonetheless, ODP motors are meant for industrial applications. An enclosure that can withstand the pressure developed during an internal explosion of specified gases and which prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure (for Zones 1 and 2). Even brief moisture intrusion can compromise the insulation system, making the windings vulnerable to ground failures. ), Flammable Gas, Vapor (e.g., ethyl either, ethylene, acetaldehyde, cyclopropane. Additionally, explosion proof equipment is designed so that its max operational temperature will not ignite the surrounding flammable atmosphere. Suitable for fixed speed, sine wave only operation. All 115v-230v motors have a built-in switch for turning the units on and off. 2022 Americraft Manufacturing Company, Inc. Do You Need an Explosion Proof Motor Suitable for a Hazardous Environment? Explosion Proof motors are certified for NEMA Class 1, Div. Welcome to FAQ Blog! Powder & Bulk Solids is part of the Informa Markets Division of Informa PLC. All Rights Reserved. Totally Enclosed Forced Ventilated (TEFV). Are there hazardous gases, vapors or dust in the air as a result of your manufacturing process? Now, we have got the complete detailed explanation and answer for everyone, who is interested! The 2014 edition of the NEC states that 1, Group D & Class II, Group E, F, & G hazardous areas. Thermal energy is transferred to the motor enclosure and removed via ambient convection or conduction with the mounting surface. Three-phase induction motors with low surface temperatures and no sparking parts can be used in Division 2 locations. Although the ODP motor doesn't require external cooling (our idler motors have an internal fan) the open concept can allow airborne contaminants and dust to enter the chamber. Ex d luminaires approved to this standard must be able to safely contain an explosion, and the accompanying pressure that develops. Of the three groups of ignition sources described above, electrical ignition sources are regularly identified as potential ignition sources during dust explosion investigations. Non-explosion proof Tornado Blowers have a totally enclosed fan cooled (TEFC) motor. They must prevent any fire or sparks from escaping the enclosure and into the surrounding explosive environments. 16" Tornado Blower with Explosion Proof, 2 hp, 110 volt, 50/60 hz electric motor. Similar to question 1, the short answer to question 2 is maybe, but additional information such as the Group designation for the material in the atmosphere around the equipment is needed. Units with TEFC motors have weatherproof plugs, and EXP (Explosion Proof) units have explosion proof plugs that conform to NEC (National Electric Code) guidelines. Identifies the physical characteristics of the hazardous materials present where the motor will be operating. Number 8860726. Therefore the right motors need to be specified and selected for use in this kind of environments otherwise the consequences of an explosion and eventual fire resulting from using the wrong kind of motor could range from minor injuries, production down time and destruction of valuable investment as well as death. However, depending on the process, other materials that require Class I or Class III classifications may be possible and should be considered. Available in 70-155mm frame sizes, EX motors feature an explosion-proof housing, making them suitable for use in explosive atmospheres. TENV motors are also suitable for applications where a cooling fan is at risk of becoming jammed or entangled by environmental contaminants. Flameproof is the word normally used by Asian & other commonwealth countries. To answer this question, one must understand that the hazard or ignition scenario that the equipment is trying to prevent is different for different Classes. The short answer is maybe, but additional information such as the Group designation for the material in the atmosphere around the equipment is needed. PRIME AIR BLOWERS- EXPLOSION PROOF AND TEFC MOTORS. An often overlooked step to improve motor reliability is simply to upgrade open drip proof (ODP) motors. Additionally, materials such as flammable gases, combustible dusts, etc., that might be considered when evaluating if an area should be classified as a hazardous area per the NEC are separated in to Groups based on their material and physical properties. Cincinnati, Ohio 45249 ), Dusts NOT included in Groups E or F (e.g., flour, starch, grain, wood, plastic, chemicals.). In fact, there were 281 confirmed dust incidents from 1980 through 2005. The motor remains dust-tight while being cooled by pre-existing fans used to provide air movement for the entire application. The enclosure is often a rigid frame, which is either smooth or finned to increase surface area and heat exhaust. A group rating is assigned to explosive or ignitable substances based on the outcome after ignition. Lines and paragraphs break automatically. Flammable Gas, Vapor (e.g., hydrogen, butadiene, ethylene oxide, propylene oxide, acrolein. Limit the maximum temperature of the motors so any flames that happen to escape the motor are cooled to a level that cannot ignite the external environment. (adsbygoogle = window.adsbygoogle || []).push({}); The enclosure is "Totally Enclosed". The autoignition temperature (AIT) of the hazardous material in the environment. These groupings are shown below: A key information required to accurately specify an electric motor in a hazardous environment is the autoignition temperature of the hazardous material, AIT for short. Division 2 specifies that these flammable materials are handled, processed, or used in the defined hazardous location, but are not normally present in concentrations high enough to be ignitable. These 8", 12" and 16", electrically powered Tornado Blowersare made for the most demanding uses, and theyhave explosion proof or totally enclosed fan cooledmotors. EExd is used by all EU. The more severe the explosion hazards, the stronger the enclosures of the motor and the longer the flame paths. Class I, Division 2. There are two primary motor types that we use on Americraft fans, TEFC (Totally Enclosed Fan Cooled) and hazardous location explosion proof motors. This is similar to the requirement for dust-ignition proof equipment; however, recall that the ignition temperature of flammable gases and vapors is generally higher than the ignition temperature of combustible dust layers.8. Finned enclosures are common, as are stainless steel materials to improve corrosion resistance. As shown above, there are two parts to the NEC requirement. 2 area?Question 1: Is an explosion proof motor appropriate for Class II, Div. When is explosion proof equipment required? Electric motors operated in such an environment need to be carefully specified and selected in order not to pose an explosion threat to an installation. An explosion-proof motor must have flame paths for exhausting hazardous gases during an explosion and for cooling the hazardous material as they leave the motor to prevent further explosion. The T-code for a given motor must be less than the AIT of the hazardous gas or mixture in the environment where the motor operates. TEFC motors are not secure against high pressure water nor submersible. Dust explosion protection becomes stronger as additional items of the pentagon are removed, but some items are more easily managed than others. 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In Class II, Division 2 locations, motors, generators, and other rotating electrical equipment shall be totally enclosed nonventilated, totally enclosed, pipe-ventilated, totally enclosed water-air-cooled, totally enclosed fan-cooled, dust-ignition proof for which maximum full-load external temperature shall be in accordance with 500.8(D)(2) for normal operation when operating in free air (not dust blanketed) and shall have no external openings.9 Justin Bishop, managing electrical engineer; Mark Fecke, senior managing mechanical engineer; Russ Ogle, principle chemical engineer, Exponent | Jul 23, 2014, Dust explosions are a known hazard in bulk solid manufacturing and process facilities. Bulk solid manufacturing and process facilities likely fall into the Class II (i.e., combustible dusts) area. An explosion-proof motor certified for use in a Class I, Division 1 location may also be operated in a Class I, Division 2 area provided the motor meets the group and T-Code requirements. TEFC (Totally Enclosed, Fan Cooled) motors and ODP (Open Drip -proof) motors can be used in Division 2 locations provided they do not have ignition sources such as arc-producing brushes or switching mechanisms. This is a key consideration in oil and gas recovery and processing, chemical processing and mining industries. In order to remove potential electrical ignition sources from an area that has been determined to be hazardous per the NEC, the electrical equipment that will be used and installed in the area needs to be evaluated and confirmed to meet the NEC requirements for electrical equipment within the specific hazardous area. In a simplified sense, electric motors are either open or closed. Enclosures are categorized as either open or totally enclosed, and there are different types of enclosures within each category. The NEC describes requirements for electrical equipment that is intended for use in each of the Classes described above and also identifies how to tell if a piece of electrical equipment is appropriate for a given Class, Division, and Group. 1 or Div. Upon sign-in, you will be prompted to register for the new site. However, these motors are unacceptable for applications with the potential for splashes, washdown or flammable gases or debris. There seems to be a problem serving the request at this time, {"modules":["unloadOptimization","bandwidthDetection"],"unloadOptimization":{"browsers":{"Firefox":true,"Chrome":true}},"bandwidthDetection":{"url":"https://ir.ebaystatic.com/cr/v/c1/thirtysevens.jpg","maxViews":4,"imgSize":37,"expiry":300000,"timeout":250}}, FDL3510M Baldor 1hp AG Duty Electric Motor 1725 RPM 56h TEFC 115/230vac 1 Phase, TECO WESTINGHOUSE XP0106 10HP 6P 1200RPM 256T TEFC 230/460V 60HZ MOTOR, Marathon 056C17G5318 Explosion Proof Motors. This means that the motor is dust tight, and has a moderate water seal as well. While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. TEAO: Totally Enclosed, Air Over. The stator is generating electricity and thus the more general name Generator Cooler is often used. This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.
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