IEC 60079-31-ed.3.0

Detail information

Designation: IEC 60079-31-ed.3.0

Publication date: 17/01/2022

Pages: 39

Country: International technical standard

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Anotation

IEC 60079-31:2022 is applicable to equipment protected by enclosure and surface temperature limitation for use in explosive dust atmospheres. It specifies requirements for design, construction and testing of Ex Equipment and Ex Components. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence. This document does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances. This document does not apply to Ex Equipment or Ex Components intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. This document does not take account of any risk due to an emission of flammable or toxic gas from the dust. This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision. Main significant changes from the previous edition are: 1) Document has been restructured from edition 2 2) Fault current rating of interrupting contacts in clauses 4.3.1 and 4.4.1, major change type C1 3) Cells and batteries in clauses 4.3.5.1 and 4.4.5.1, major change type C2 4) Overload or malfunction condition for the determination of temperature class for "tb" converter fed rotating electric machines, major change type C3 5) Additional requirements for entry devices with dust ignition protection by enclosure "t", major change type C4 Information about the background of ‘Major Technical Changes’ C1 – Ex Equipment having Level of Protection "ta" shall be rated for connection to a circuit with a prospective short circuit current of not greater than 1.5 kA. For Ex Equipment having Level of Protection "tb" or "tc" which is intended for mains connection and intended to interrupt fault current above 10kA, the equipment shall have a rated maximum short circuit withstand current, be tested according to 6.1.1.1, and be marked according to Clause 7. C2 – For Ex Equipment having Level of Protection "ta" which contains a cell or battery, only a sealed cell or battery shall be used. For Ex Equipment having Level of Protection "tb" and "tc" where there are sparking contacts or hot surfaces, and which contains a cell or battery, only a sealed cell or battery shall be used. C3 – Table 2 now includes malfunction conditions for temperature class determination of Level of Protection "tb" converter-fed electric machines. C4 – Annex A added for entry devices with Type of Protection "t" including cable transit devices. The contents of the corrigendum of October 2023 have been included in this copy. LIEC 60079-31:2022 est applicable a l’appareil protege par enveloppe et limitation de la temperature de surface, pour une utilisation en atmosphere de poussiere explosive. Elle specifie les exigences de conception, de construction et dessai pour l’Appareil Ex et les Composants Ex. Le present document complete et modifie les exigences generales de l’IEC 60079-0. Lorsquune exigence du present document est en contradiction avec une exigence de l’IEC 60079-0, l’exigence du present document prevaut. Le present document ne s’applique pas aux poussieres d’explosifs dont la combustion n’exige pas l’oxygene de l’air, ni aux substances pyrotechniques. Le present document ne s’applique ni a l’Appareil Ex ni aux Composants Ex destines a une utilisation dans les parties souterraines des mines, ni aux parties des installations de surface des mines ou il existe des risques de grisou et/ou de poussieres combustibles. Le present document ne prend en compte aucun risque resultant d’une emission de gaz inflammable ou toxique provenant de la poussiere. Le contenu du corrigendum doctobre 2023 a ete pris en consideration dans cet exemplaire.