Most modern ODP motors feature an IP23 rating, meaning that the motor is protected from fingers and solid objects greater than 12 mm, and that water falling as a spray at an angle up to 60 from the vertical shall have no harmful effect on the equipment inside of the enclosure. 1, Group D & Class II, Group E, F, & G hazardous areas. All units come with 25 feet of electrical cable rated for "Extra Hard Use". If it is present under normal operating circumstances, it is a Division 1 location. The table below gives the temperature codes for motors operating in hazardous environment according to NEC/CEC & IEC letter designations are given in the table below: The minimum requirements for motors for use in Class I, Division 2 locations are less stringent than those for use in Class I, Division 1 locations. While explosion proof equipment is designed to prevent the ignition of specified gases or vapors surrounding the equipment when an explosion occurs inside the equipment, explosion proof equipment is not necessarily designed to keep dust from entering the equipment. All Rights Reserved. Web page addresses and e-mail addresses turn into links automatically. A group rating is assigned to explosive or ignitable substances based on the outcome after ignition. Are there hazardous gases, vapors or dust in the air as a result of your manufacturing process? Why? 2) Is a totally enclosed, fan-cooled (TEFC) motor appropriate for a Class II, Div. 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 Motors to be suitable for Class I, Groups A, B, C & D, Division 2 are available as any enclosure, Motors suitable for Class II, Groups F & G, Division 2 are available in TEFC, TEFC-XT, TEBC, TEAAC and TEWAC only, Any grounding provisions must be in the main conduit box, Motor accessories must be non-sparking or approved for Explosion Proof (XP) duty, Ambient may not exceed 60C (make addition for higher than 40C ambient as required), Space heaters, if required, must have a sheath temperature not exceeding 80% of the ignition temperature of the appropriate class and group, Totally enclosed heavy guage steel and cast iron construction, 60Hz & 50Hz data included on the nameplate, Super-E explosion proof motors have NEMA Premium efficiency and 3 year warranty, California Transparency in Supply Chain Act of 2010 Disclosures. Because a computer controls the motor instead of mechanical brushes, it's more precise. Number 8860726. 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. If the combustible material is only present during a separate fault or equipment failure, it is a Division 2 location. For added protection, the blades are often made of materials that won't accumulate static electricity or otherwise become prone to sparking. ), Flammable Gas, Vapor (e.g., ethyl either, ethylene, acetaldehyde, cyclopropane. With a bit of care, you can expect this type of motor to work well and have a long life. Electric motors have innumerable applications. This is a key consideration in oil and gas recovery and processing, chemical processing and mining industries. Open Drip Proof ODP motors are almost always the least expensive of all motors which often times makes them the preference of equipment OEM's. Non-explosion proof Tornado Blowers have a totally enclosed fan cooled (TEFC) motor. Factors such as ambient explosive gas, weather conditions or environmental contaminants like dust, debris, moisture or chemicals are critical considerations in motor selection. Recall that the NECs definition of explosion proof equipment is equipment enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby6, but the definition of dust-ignition proof equipment is equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heat otherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmospheric suspensions of a specified dust on or in the vicinity of the enclosure.7 Upon sign-in, you will be prompted to register for the new site. Available in 70-155mm frame sizes, EX motors feature an explosion-proof housing, making them suitable for use in explosive atmospheres. Welcome to FAQ Blog! These areas are defined as Class I, II, and III. A dust explosion occurs when a fuel, ignition source, oxygen, confinement, and dispersion come together. 7937 School Road TEAO: Totally Enclosed, Air Over. Advances in Industrial Explosion Protection Technologies. Potential ignition sources include, but are not limited to, mechanical ignition sources such as mechanical sparks and frictional heating, chemical ignition sources such as self-heating, spontaneous combustion, or other exothermic reactions, and electrical ignition sources such as static electricity and electrical equipment. Bulk solid manufacturing and process facilities likely fall into the Class II (i.e., combustible dusts) area. A hazardous environment or location is some combustible materials that could easily ignite and create a fire hazard. Explosionproof equipment and wiring shall not be required and shall not be acceptable in Class II locations unless also identified for such locations. If any of the five items identified in the pentagon are removed from the pentagon, an explosion can be prevented. They can also be used for cooling or drying applications. PetroWiki. This means that the motor is dust tight, and has a moderate water seal as well. 1 areas. They are also not explosion proof without additional modifications. Free Flow CFM 6,950 @ 60 hz, 5750 @ 50 hz. 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. Once you have an idea of the type of environment in which your fan will operate, contact us and we can discuss your needs further to make sure you have considered all possibilities before buying a fan with a hazardous duty explosion proof motor. Now, we have got the complete detailed explanation and answer for everyone, who is interested! 
2 area? The more severe the explosion hazards, the stronger the enclosures of the motor and the longer the flame paths. Following the launch of our new website on 9/22,we are asking existing customers to register for this new site. Specifically, Division 1 motors only require a single equipment failure that of the motor to create a perilous condition; Division 2 requires a motor fault, plus another equipment failure as well. 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 Need Explosion Protection & Safety Equipment? All 115v-230v motors have a built-in switch for turning the units on and off. An electric motor is considered explosion-proof when it is capable of containing an internal explosion without rupturing and putting the entire industrial facility at risk. Explosion proof is an American Word. Totally Enclosed Forced Ventilated (TEFV). So, feel free to use this information and benefit from expert answers to the questions you are interested in! Some basic characteristics and requirement for motors for use in Class I, Division 2 locations are enumerated below: Selecting the right kind of motor that meets the requirements for use in hazardous environment is not an easy task. This requirement is traditionally depicted using an explosion pentagon as shown above. 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. 16" Tornado Blower with Explosion Proof, 2 hp, 110 volt, 50/60 hz electric motor. To get the full benefit of using classified equipment, the equipment must be installed appropriately for the area. 2022 WorldWide Electric. Additionally, explosion proof equipment is designed so that its max operational temperature will not ignite the surrounding flammable atmosphere. This is to ensure that the hazardous materials do not spontaneously ignite when it contacts the motor surfaces and enclosure during operation. This information is not intended to recommend a specific hazardous duty motor, but to provide you with enough information to ask the right questions when selecting a motor for your fan. The enclosures of dust-ignition-proof motors are designed to exclude hazardous materials from accessing the internals of the motors unlike explosion-proof motors. Arcs, sparks and high temperatures on the surfaces of electric motors are common sources of ignition of hazardous substances. Our team has collected thousands of questions that people keep asking in forums, blogs and in Google questions. 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). The T-code of a dust-ignition-proof motor must correspond to a maximum surface temperature below the AIT of the hazardous dust materials. Type d (Exd): Explosionproof/Flameproof Enclosure. There is also the TEFC, explosion proof (TEFC-XP) variant. Flameproof is the word normally used by Asian & other commonwealth countries. When is explosion proof equipment required? The temperature value defined by the T-code applies under all conditions of motor operation including burnt out, overload and locked rotor current. TENV motors are also suitable for applications where a cooling fan is at risk of becoming jammed or entangled by environmental contaminants. The NEC identifies three specific areas where explosion hazards may exist, as it relates to electrical equipment. 1, Group D & Class II, Group E, F, & G hazardous areas. However, these motors are unacceptable for applications with the potential for splashes, washdown or flammable gases or debris. Group ratings start with A through G and are rated in descending order according to the stringency of the motor design requirements. 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. If you have previously used our Shopping Site, you may sign in using youremail address(not username) and your password from our previous website. Suitable for fixed speed, sine wave only operation. Finned enclosures are common, as are stainless steel materials to improve corrosion resistance. Copyright 2022. They are used for ventilation of tanks, manholes, process vessels and similar confined spaces.
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. 1 or Div. ), Dusts NOT included in Groups E or F (e.g., flour, starch, grain, wood, plastic, chemicals.). Our extensive line of Division 1 Explosion Proof motors are designed and built to contain an explosion inside and not propagate it into the surrounding atmosphere. Class I materials are flammable gases; Class II materials are pervasive, flammable dusts. 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. If you are new to WorldWide Electric or have never used our shopping site, please contact us to set up an account. These motor enclosures prevent a potential motor arc or explosion from igniting a dangerous environment that contains flammable dust or gas. ), Flammable Gas, Vapor (e.g., acetone, ammonia, benzene, butane, ethanol, gasoline, methane, natural gas, naphtha, propane. Division is determined by prevalence of the material. Check out Powder & Bulk Solids Industry Master directory. 1 area, not be appropriate for a Class II, Div. Unless thoroughly flushed from the equipment before it dries, the residual salt will rust the steel laminations of the stator and rotor cores. ), Carbonaceous Dusts (e.g., carbon black, coal, coke dust. This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Get product announcements, news posts, and other WorldWide Electric content sent straight to your inbox. View cart for details. 1 area? Four basic information are required to specify and select the right motor for use in a hazardous environment: 4. However, depending on the process, other materials that require Class I or Class III classifications may be possible and should be considered. During dust explosion investigations, it is routine to find electrical equipment that is not appropriate for the classified (hazardous) location that it is located within even though facilities personnel thought the equipment was appropriate. Explosion Proof motors are certified for NEMA Class 1, Div.
Class II areas are those where an explosion or fire hazard exists due to the presence of combustible dusts, and Class III areas are those where an explosion or fire hazard exists due to the presence of ignitable fibers/flyings.2 The NEC refines each Class into either Div. Question 2: Is a totally enclosed fan-cooled (TEFC) motor appropriate for a Class II, Div. Ex d luminaires approved to this standard must be able to safely contain an explosion, and the accompanying pressure that develops. 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. The first is explosion proof equipment is not required when trying to meet the equipment requirements for Class II, Div. Classified equipment may not work properly if it is installed improperly.Electrical Motors in Class II Locations Understanding how dust explosions occur and what electrical equipment is appropriate for a given classified location are critically important when trying to mitigate the risk of a dust explosion. U2>k PbcmUnbkC1,_7 , The plate defines the class, division and group compliance of the motor. All rights reserved. Class I, Division 2. 6"G'v@sW.>94>a The enclosure is "Totally Enclosed". Three-phase induction motors with low surface temperatures and no sparking parts can be used in Division 2 locations. TEFC motors are not secure against high pressure water nor submersible. As class II locations contain ignitable dusts, electric motors operating in this kind of environment must be dust-ignition-proof. 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. This is a question our experts keep getting from time to time. An enclosure protects a motor from contaminants in the environment in which it is operating. As is apparent from the definition, explosion proof equipment is designed to prevent ignition of a specified gas or vapor and not combustible dusts. 2022 Americraft Manufacturing Company, Inc. Do You Need an Explosion Proof Motor Suitable for a Hazardous Environment? Flammable Gas, Vapor (e.g., hydrogen, butadiene, ethylene oxide, propylene oxide, acrolein. Thermal energy is transferred to the motor enclosure and removed via ambient convection or conduction with the mounting surface. The second part is if explosion proof equipment is chosen, then the equipment must also be identified as being appropriate for a Class II area and must also be identified as being appropriate for the Div. u m2Lr!r*|^;i7PLojEGcw^40Z!YUiR q"29p.W8
#a}1I1\JAi668DZ B0Lo>D- 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. When challenges arise, consult Worldwide Electric. Totally enclosed, fan-cooled (TEFC) motors often feature IP ratings of IP54 or IP55, which permit a very limited amount of dust to intrude into the motor enclosure and protect the motor against splashing (e.g., IP54) or directed water jets (e.g., IP55). 1 area? General Purpose Industrial Electric Motors, TEFC (Totally Enclosed Fan Cooled) Explosion-Proof Motor General Purpose Industrial Electric Motors, Enclosure Type: TEFC (Totally Enclosed Fan Cooled), Special Motor Construction: Explosion-Proof Motor, 15HP Electric Motor Baldor D98251029 230/460 V 3530 Rpm 3PH Frame 254T. These 8", 12" and 16", electrically powered Tornado Blowersare made for the most demanding uses, and theyhave explosion proof or totally enclosed fan cooledmotors. All units are fully assembled when shipped from the factory. They can withstand limited exposure to moisture, oils or chemicals and can shield the motor from potential drips or trickle from specific incidence angles. EExd is used by all EU. Enclosures are categorized as either open or totally enclosed, and there are different types of enclosures within each category. International Powder & Bulk Solids Conference & Exhibition, Allowed HTML tags: . Athlon Classic Plus Generators, Single Bearing, Athlon Classic Plus Generators, Double Bearing, Athlon Classic Plus Pancake Light Tower Generators. This is your one-stop encyclopedia that has numerous frequently asked questions answered. Explosion-proof fans also use motors that are designed not to produce sparks as they cycle on and off. Toll Free 800-848-2938 Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. PRIME AIR BLOWERS- EXPLOSION PROOF AND TEFC MOTORS. Something went wrong. They must prevent any fire or sparks from escaping the enclosure and into the surrounding explosive environments. Identifies the physical characteristics of the hazardous materials present where the motor will be operating. As shown above, there are two parts to the NEC requirement. Nonetheless, ODP motors are meant for industrial applications. Enclosed motors serve the bulk of industrial applications. In fact, there were 281 confirmed dust incidents from 1980 through 2005. 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. (adsbygoogle = window.adsbygoogle || []).push({}); The enclosure is "Totally Enclosed". By using the Worldwide Electric website you consent to the terms and conditions as outlined in our Privacy Policy. 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. Understanding how dust explosions occur and what electrical equipment is appropriate is critically important when trying to mitigate risk. Electrical motors are found throughout industry and are commonly found in classified locations. They also have a switch to easily convert the motor from 115 volt to 230 volt capability. This will only need to be done once! In addition, the type of enclosure affects the cooling of the motor. Cincinnati, Ohio 45249 From these, 119 lives have been lost in addition to the 718 injuries resulting from these incidents.1 1 area? The autoignition temperature (AIT) of the hazardous material in the environment. The motor selection is based on the environment in which the fan will operate. There are two primary motor types that we use on Americraft fans, TEFC (Totally Enclosed Fan Cooled) and hazardous location explosion proof motors. CAUTION: Only the end user or a qualified underwriter is to identify and select the proper class, division, group and temperature code motor to meet your requirements. The Class/Division/Group system below is intended to give you broad understanding of hazardous area classifications. In this case, explosion proof does not mean that the motor will not explode, nor is it impervious to external explosions. 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. Note that the maximum full-load external temperature should be in accordance with Table 1, but this does not mean that it can be above the auto ignition temperature of the specific combustible dust to be encountered by the equipment or above 329F for organic dusts that may dehydrate or carbonize. If so, you may need to consider purchasing a motor suitable for hazardous locations. Saltwater flooding poses additional problems. Our experts have done a research to get accurate and detailed answers for you. They are ready to use right out of the box. 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. Americraft Manufacturing, Inc. TEWAC stands for Totally Enclosed Water to Air Cooled and relates normally to the provision of motor stator cooling. 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. TEFC motors are more resilient than ODP motors, and they are common in pump, fan, compressor, conveyor and material handling applications. 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. Two questions that are frequently asked by facility personnel regarding the choice or appropriateness of a given motor are: The first part of the requirement above confirms that the TEFC motor style is appropriate; however, the TEFC motor must also have a maximum full-load external temperature, under normal operating conditions, in accordance with the Table 1 and it must also have no external openings. ), Metal Dusts (e.g., aluminum, magnesium and their commercial alloys. An often overlooked step to improve motor reliability is simply to upgrade open drip proof (ODP) motors. One technique that is routinely used to mitigate the risk of a dust explosion is the removal of potential ignition sources. While Division 1 motors in Class I locations must be explosion-proof, Class II, Division 1 motors must be dust- ignition-proof. Class I areas are those where an explosion or fire hazard exists due to the presence of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors. Additionally, the light-duty ODP enclosure results in a lightweight motor, enhancing portability. This means that the motor is dust tight, and has a moderate water seal as well. How could a piece of explosion proof equipment, that is appropriate for a Class I, Div. Sometimes this is a straightforward swap, but often there are other considerations to navigate, such as power supply, RPM, torque and horsepower. There is no sparking and much less electrical noise. Washdown duty motors typically have IP ratings of IP56. In case of DC Series motor, as the speed of Motor increases, the armature current and hence the field flux will decrease and therefore Back emf E can never be greater than the supply voltage V. Therefore, Regenerative Braking is not possible in DC Series Motor. Motors that satisfy UL explosion proof certification are clearly identifiable by a UL listing identification plate, affixed to the motor enclosure. A totally enclosed, fan-cooled (TEFC) motor is much more adaptable to outdoor locations and high moisture areas. 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. There is no difference except term. Dust Explosion Basics The open nature also provides excellent thermal management. and Group where the equipment will be used. Class I and Class II are divided into groups according to the behaviour of the hazardous material after it has been ignited. Identifies the probability of the hazardous material being able to explode or ignite.. 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. 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. V Class 1 Hazardous Locations refer to facilities which deal with flammable gases, vapors, and liquids. 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.