爆炸性环境.第31部分:外壳“t”的设备粉尘点火保护

[中文适用范围]： 本部分IEC 60079适用于在爆炸性粉尘环境中使用的外壳和表面温度限制保护的电气设备。它规定了Ex设备和Ex组件的设计、构造和测试要求。 本文件补充和修改了IEC 60079-0的一般要求。当本文件的要求与IEC 60079-0的要求冲突时，以本文件的要求为准。 本文件不适用于不需要大气氧燃烧的爆炸性粉尘或自燃物质。 本文件不适用于用于矿井地下部分以及受瓦斯和/或可燃粉尘威胁的矿井地表部分的Ex设备或Ex组件。 本文件不考虑粉尘释放易燃或有毒气体带来的任何危险。 在可能同时或分别存在可燃粉尘和爆炸性气体的环境中应用电气设备时，需要考虑额外的保护措施。 本文件不包含用于同时或分别存在可燃粉尘和爆炸性气体环境的Ex设备的要求。爆炸性气体环境的要求可以在IEC 60079系列的其他部分找到。关于在可燃粉尘和爆炸性气体同时存在（“混合混合物”）时使用的Ex设备的指南可以在IEC 60079-14中找到。 当Ex设备需要满足其他环境条件时，例如防水和耐腐蚀，可能需要采取不损害外壳完整性的额外措施。使用的措施不应对外壳的完整性产生不利影响。 [外文原描述]： IEC 60079-31:2022 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. 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.