Generally confined within closed containers or closed systems, but escape in case of accident or abnormal operating of equipment. Since the changes to the code, hazardous locations with gases or vapors class i present can be reclassified as zone 0, 1 or 2. In electrical engineering, hazardous locations are defined as places where fire or explosion. Oil immersion the electrical components are immersed in oil, thus excluding the explosive atmosphere from any sparks or hot surfaces. Zone vs class division instrumentation tools inst tools. Zone 2 is much the same as division 2 with gas present less than 10hours per year. Youll find zone 1 locations roughly equivalent to division 1 locations, and zone 2 locations roughly equivalent to division 2. Class i, zone 0 or zone 1 locations may not abut class i, division 1 or division 2 locations.
Heat trace connector for the process and oil industry 101 kb mc6 current limiter 397 kb microseries class 1, division 2. Acetone benzene butane hexane paint solvents natural gas. Ul class i division 2 groups a b c and d atex zone 2 and iecex zone 2 certification. Differences between class 1 division 1 and class 1 division 2. Tiis means technology institute of industrial safety, ministry of labor, japan d2g4 i3ag5 ex d ii bt4 ex ia ii ct5 class i, div. For the purpose of this subchapter, a flammable gas division 2. Csa also accounts for the european zones, which are equivalent to divisions. Comparison table of explosionproof standard more easily ignited note.
All that being said class i, division 2, group d is most likely zone 2, iia unless its methyl acetate, of course. There are two different divisions that exist in class i, division 1 and division 2, along with three zones. Areas made hazardous by the presence of easily ignitable fibers or dust, but which are not likely to be in suspension in the air in quan tities that are sufficient to ignite division 1. Comparing iec, nec, and cec zones standard with neccec classdivision standard. Even at the bottom end what may have been classified zone 2 or division 2 by one system may be unclassified by the other.
For example, in north america, you may see class 1, division 1, while in europe you would see class 1, zone 1. Zone zero applies to the internal space such as the space within a tank or sump. The majority of areas classified in north america are class and division. In 1947, the nec first recognized different levels of risk exist in hazardous locations. Class iii, division 2 location a location in which easily ignitable fibers are stored or handled other than in the process of manufacture. When comparing divisions and zones, division 2 is equivalent to zone 2, but division 1 is equivalent to either zone 0 or 1. Understanding atex and explosive areas tmc fluid systems. Flameproof enclosures flameproof ex d ii enclosures were permitted in division 1 and 2 locations provides that. Where embedded electrical products are concerned, the requirement for harsh environment industries such as oil and gas will usually be certification to class 1 division 2 andor atex zone 2. Type y ca class i, division 1 nfpa 496 type z us class i, division 2 fm 3620 nfpa 496 type z ca class i, division 2 nfpa 496 aex px or aex pxb us class i, zone 1 ansiul 60079 2 ex px or ex pxb ca zone 1 cancsa c22. Wiring requirements in hazardous locations iaei magazine. Classdivision hazardous location 33 introduction a major safety concern in industrial plants is the occurrence of fires and explosions. It was the first hazardous location approval puls applied for.
What are the differences between class 1 division 1 and class 1 division 2. One of the following four situations must exist in order for an area to be considered a class i, zone 2 location. Differences between class 1 division 1 and class 1. Just as in class i, division 1 and 2, the subdivision of class ii into divisions 1 and 2. Class i, division 2 to unclassified, or from class i, zone 1 to. Hazardous areas technical guide explosion protection terminology and regulations introduction. Equipment listed and marked in accordance with 505. Consequently, it established division 1 and division 2, to provide a means. Standalone solar electrical installations in hazardous. Class i div 2 is important for north america and canada. Consequently, it established division 1 and division 2, to provide a means to.
Abb motors and generators nema explosion proof ac and dc motors 5 nema explosion proof ac and dc motors division 1 capabilities single phase 0. Class i locations are further subdivided into two divisions and three zones. Its obvious that equipment specifically designed for use in zone 1 in europe cannot always be used in division 1. Class i, division 2 or zone 2 classified locations. The equipment must be evaluated in terms of an equivalent. Ul and cul hazardous areas certification for north. Comparison of division and zone systems iaei magazine. Class 1 division 2 and atex zone 2 explained assured systems. There are three hazardous location classes respectively class 1, class 2, and class. Group ii is for explosive gases zone 0, 1 and 2 and group iii is for explosive dusts zone 20, 21 and 22. Classification in classes class i div 2 applicable standards. Its immediately clear that the european zone 2 and the american division 2 can be considered equivalent, while the american division 1 includes both the european zone 1 and zone 0. In a division 1 area, vapors and gas emissions are assumed to be present during normal operations.
No other aspect of industrial safety receives more. For dust zone 21 is like division 1 and zone 22 is like division 2. Where ignitable concentrations of flammable gases, vapours. Group is divided in three groups where group i is reserved for mining locations. Division 2 is equivalent to zone 2, while division 1 is either zone 0 or 1. One of the following three situations must exist in order for an. Some of the considerations were common within the process industry and others were specific to the individual operating environment of the company. While iec zone 0 would always be division 1, iec zone 1 could be either division 1 or division 2. Powder filling equipment is surrounded with a fine powder, such as quartz, which does not allow the. Class i, division 1 class i, division 2 class ii, division 1 class ii, division 2 class iii, division 1 class iii, division 2. Wiring requirements within class i hazardous areas using division system are found in part ii of article 501. The decision to change from division to zone classification was not an easy one. These motors meets, during normal operation, the definition in the national electric code 19965018b for motors permitted to be installed in class 1, division ii areas. Class 1, division 2 hazardous locations dietz electric.
Zone 0 is reserved for those areas continuously hazardous e. The recognized acceptable wiring methods are included in 501. The key difference between divisions and zones relate to terminations. Understanding class 1 division 2 hvac getexplosionproof. Zone zero and atex apply to flammable gas always present or greater than hours per year. Ignitable 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. Ul class i division 2 groups a b c and d atex zone 2 and. Comparing ul classes and divisions with atex directives. Class 1 division 2 identifies a hazardous location which flammable liquids, gases or vapors are. Basics of explosion protection hazardous materials class division system zone system gasses or vapors class i, division 1 zone 0 zone 1 class i, division 2 zone 2 combustible dusts class ii, division 1 zone 20 zone 21 class ii, division 2 zone 22 fibers or flyings class iii, division 1 class iii, division 2 no equivalent. Wiring requirements for the class i, zone system are found in 505. Type 8 enclosures constructed for either indoor or outdoor use in hazardous classified locations classified as class i, division 1. Zone vs class division in 1947, the nec first recognized different levels of risk exist in hazardous locations. By bill dong posted on january 25, 2017 february 2.
If someone can tell me or point me to a site or source for such a rookie question, it would be greatly appreciated. Industrial computing for class 1 division 2 and atex zone 2. To be considered a dust, the combustible material must exist as a finely divided solid of 420 microns 0. In the final analysis of the zone rules, the only type of electrical items you can install within zone 0 locations is the intrinsically safe type. Hazardous area classification hazardous locations quick tips. In addition, equipment that is suitable for class i div. Requirements for other equipment and materials are more complex. Division 2 is also a subset of class i and is classified as an area where the explosive or flammable gases, vapors or liquids mentioned above are not likely to exist during regular operation. Class division definitions class i contains flammable gases or vapors in quantities large enough to produce an explosion.
876 308 406 288 1418 1535 1318 1072 483 493 153 128 774 910 1072 1079 1061 86 1386 1247 1586 258 26 1362 959 691 803 695 961 963 203 666 48