Equipment Group II

The equipment group II comprises the categories 1, 2 and 3 for equipment with increasing ignition probabihties described as follows  

Exact criteria for the classification into categories can be found in the annex I 

The following overview represents the essential properties and requirements for equipment of group II for their assignment to categories. 

The requirements for explosion protection on equipment of group I as well as on equipment of group II for mixtures of combustible dusts and air are not further described here. 

The equipment is capable to ensure a very high level of protection in the event 

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Special requirements for construction, test and marking of electrical apparatus of equipment group II, category 1 G. 

Speaking in the classification scheme of ATEX 100a Directive, these standards cover equipment Group II, categories ID, 2D and 3D. It may be expected that CENELEC will complete this set of standards in the future. 

Table 3.7(b) Part B Harmonized European Norms (HN) - explosion protected equipment (Group II apparatus)... 

Part B Explosion protected electrical equipment - Group II Austria BVFA... 

Note Equipment group I applies to equipment intended for use in underground parts of mines, and in those parts of surface installations of such mines liable to be endangered by firedamp and/or combustible dust. Equipment group II applies to equipment intended for use in other places liable to be endangered by explosive atmospheres [18]. The degree of hazard increases fl om A to C the sub-division into 1-3 is done in [16]. 

Equipment group II Equipment intended for use in other areas that are may be endangered by explosive atmospheres. 

Table 6.6 Overview about the assignment between equipment categories and zones for the implementation of the explosion protection for the equipment group II.

Non-electrical equipment of the equipment group II, category 2 for explosive atmosphere formed from air and gases, vapours and/or mists, type of protection flame-proof enclosure, permissible explosive atmosphere of the Ex-Group IIB, T-Class T4, ambient temperature (T ) with 0°Cdiffering from the standard values -20 °C < T. -t-TO C ... 

FPN No. 4) It is necessary that the meaning of the different equipment markings and Group II classifications be carefully observed to avoid confusion with Class I, Divisions 1 and 2, Groups A, B, C, and D. 

Group II - category 1 equipment is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by dust-air mixtures are present continuously or for long periods or frequently... 

Harmonized European Norms (HN). Group I equipment shall be additionally marked with an Tin a circle according to Directive 82/130/EEC. (b) Marking of Group I equipment in case of a control certificate according to Directive 82/130/EEC. For Group II equipment with a control certificate , the I in the circle shall be deleted. 

Explosion protected electrical equipment for zone 1 (Group II, category 2 G) and the classical firedamp-proof apparatus for coal mines (Group I, category M2) are covered by the B module (EC-type examination) and by the C module (conformity to type) or the E module (product quality assurance). Alternatively, with respect to the B module, the notified body issues an EC-type examination certificate (in German EG-Baumusterpriifbescheinigung), whose marking mainly includes ... 

Table 3.11 lists the notified bodies according to Directive 94/9/EC. It is noteworthy that competence and responsibility of a notified body may be restricted to certain types of explosion protected equipment (e.g. non-electrical apparatus only), to one group only (e.g. Group II) or to a selection of modules, e.g. to quality assurance related modules. The notified bodies are not obligated to cover the complete field of explosion protection. Nevertheless, some notified bodies cover the total range and can provide a single-stop-procedure to their clients. 

Austria TUV-A TUV-Osterreich A-1230 Wien Group II, equipment where the source of ignition is primarily electrical B, C, D, E, F, G... 

Materials selection for centrifugal pumps is contained in API 3 610, Appendixes E and F. Another source of information is API s Guide for Inspection of Refinery Equipment, Chapter II. In addition, both NACE Group Committee T-8 on Refining Industry Corrosion and the API Corrosion Committee publish minutes of their semiannual meetings. An index of Group Committee T-8 s minutes has been produced so that information on any topic discussed can be located. 

Group I equipment is used in the mining industry and Group II equipment in other industries. Letters A, B or C markings following the Croup number indicate the suitability of the equipment for various gases subject also to the marking for the appropriate temperature classification. 

Table X/3.2.2 1 Area Classification for Equipment (ATEX 95) Group I Equipment in Mines Below or Above in Explosive Atmospheres Group II Equipment in Other Locations, Endangered by...

Figure 28. Equipment utilized in a study of the feasibility of using e to mark brook trout (Salvelinus fontinalis). (a) Radioassay of Group I trout, using needle scintillation probe, (b) Constant-geometry tank for radioassay of Group II trout, (c) Relationship between logio (count rate) and time for Group I trout, from radioassay by the needle scintillation probe over the heart-liver region. Values plotted are geometric means for all fish assayed on each day. From Scott (1961).

Toluene diisocyanate is regulated by the Department of Transportation (DOT) as a Packaging Group II Toxic. Since TDI can cause serious injury to the lungs, eyes, and skin, all persons near the unloading site must wear protective clothing and equipment. They must observe the safe handling procedures and practices... 

Symposium on Earthquake Effects on Plant and Equipment (Vols I and II), Organized by BHEL energy system group Hyderabad, India, and Indian Society of Earthquake Technology, Roorkee, India (1984). 

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