Weidmueller - Elektroinstalační krabice pro průmyslové aplikace (EN)

| Kategorie: Katalog  | Tento dokument chci!

Všechny kapitoly z katalogu elektroinstalačních krabic a kabelových vývodek.

Vydal: Weidmüller, s.r.o. Autor: Weidmüller

Strana 297 z 319

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Intrinsically safe i Limited safe level ignition energy Intrinsic safety for products where electrical energy which flows into the product, is stored the product, not sufficient to ignite the surrounding explosive atmosphere. The surrounding possibly explosive atmosphere can enter the enclosure and will produce internal explosion during the equipment’s lifespan. The surface temperature the relevant parts limited to a value below the ignition temperature. Protection concepts The zoning described above provides the basis for the selection the type ignition protection. IECEx scheme . Recent standards were initially adopted IEC standards. They can viewed online and printed out. So, example, in the ATEX applicable areas, only ignition protection devices meeting for Zone (highest probability explosive atmosphere being present) are allowed. Increased safety is achieved reducing the current load and raising the isolation properties and maintaining clearance and creepage distances above the value industrial application. Devices using this protection principle may not be installed Zone 0. rms). All connections the enclosure are sized that they cannot transmit explosion from inside the surrounding atmosphere. The standards used for the production the test report correspond almost entirely the harmonised standards in Europe. A.com) electronic certificate. Intrinsically safe equipment and intrinsically safe parts of the associated equipment are divided into protection levels: ia (for zones and 2), (for zones and 2), and ic (only for zone 2). For this sort ignition protection the explosion groups apply (IIA, IIB, IIC). The certificates awarded this scheme are published the IECEx website (www.Technicalappendix W W. The enclosure must therefore stable enough ensure that not deformed destroyed the pressure created. Similarly, industrial components for use potentially explosive atmospheres are often made suitable encapsulating them pressure-resistant enclosure which otherwise could not used. A typical application area are control and display circuits with low voltage and current. This also applies fault conditions. The methods that achieve intrinsic safety mean that important that not only the devices installed direct contact with the explosive atmosphere are constructed correctly, but also the electrical devices which they are connected.g.C. the technical committee TC31’s IEC standards. A Certificate Conformity (CoC) refers test report (Ex Test Report ExTR) and assessment the quality assessment report from the manufacturer (QAR). Pressure-resistant encapsulation Limits the explosion the inside the enclosure Pressure-resistant encapsulated enclosures are designed for devices where sparks are generated which have hot surfaces which are source ignition during normal operation. This protection scheme usually used for distribution cabinets. These connections are known ignition gaps. The highest voltage permitted for this protection scheme (D.C.5 IECEx scheme The IECEx scheme international certification scheme for products which meet the requirements the international standards, e. Increased safety e No sparks and surface temperature limited to safe level Increased safety for products where there are sparks produced during normal operation case failure.iecex