USEFUL INFORMATION www.krausnaimer.com USEFUL INFO 243 MAIN CATALOG ATEX groups and category of equipment EMC These groups are sub-divided into categories, as shown below. The way in which this categorisation has been developed highlights one of the main distinctions of Group I and II. For Group I, the categorisation depends on (amongst other factors) whether the product is to be deenergized in the event of an explosive atmosphere occurring. For Group II, it depends where the product is intended to be used in and whether a potentially explosive atmosphere, is always present, or is likey to occur for a long or a short period of time. Group I: Underground an d above ground installations for mining industry with hazardous choke damp and mine dust Category Accepting Category M1 Very high level of protection Safety in the event of two faults occurring independently of each other Category M2 High level of protection Device must be turned OFF in case of potentially explosive atmosphere Group II: Other ex-areas Category Accepting of danger Accepting Zone Substance class Category 1 Highly likely to occur and are present continuously, for long periods of time or frequently Very high level of protection Safety in the event of two faults occurring independently of each other Zone 0 G (Gases) Zone 20 D (Dusts) Category 2 Likely High level of protection Safety in the event of one fault Zone 1 G (Gases) Zone 21 D (Dusts) Category 3 Unlikely Normal level of protection Suitable for normal operation Zone 2 G (Gases) Zone 22 D (Dusts) Maintenance switches for EMC-compliant connection of variable speed drives are available either with shield clips (KS- and KL-enclosures) or with clips mounted on DIN rails (STM-enclosure). These clips are used to continue the cable shield circiut through the enclosure. The configuration of the Maintenance switch between Frequency Converter (FC) and motor allows the use as Disconnector up to 400 Hz and as load switch at frequencies from 40 to 100 Hz. Each Maintenance switch has a standard 2 Auxiliary contacts, 1 NC and 1 NO. Via the NO (20 ms leading) the FC can be switched OFF before the main contacts of the switch open. For the rating of the switch please note that the motor may have approx. 10 % higher charging rate due to the higher loss in FC-operation e.g. a motor with 7,5 kW rating the motor current has to be determined with 16,7 A instead of 15,2 A. Group I comprises equipment intended for use in the underground parts of mines, and to those parts of surface installations of such mines, likely to become endangered by firedamp and/or combustible dust. Group II comprises equipment intended for use in other places likely to become endangered by explosive atmospheres. ATEX and EMC < Back to the catalog directory >
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