爆炸性气体环境.第31部分:"t"型外壳的防尘点火设备防护

[中文适用范围]： 本部分IEC 60079适用于采用外壳和表面温度限制保护的电气设备，用于爆炸性粉尘环境。它规定了用于爆炸性粉尘环境的电气设备和Ex部件的设计、制造和测试要求。本标准补充并修改了IEC 60079-0中的一般要求。如果本标准的要求与IEC 60079-0的要求冲突，以本标准的要求为准。本标准不适用于不需要大气氧进行燃烧的火药粉尘，也不适用于自燃物质。本标准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面设施部分的电气设备或Ex部件。本标准不考虑粉尘排放易燃或有毒气体所带来的任何风险。在应用电气设备的大气中既含有可燃粉尘又含有爆炸性气体（无论是同时存在还是分别存在）时，需要考虑采取额外的保护措施。当电气设备需满足其他环境条件（例如防水和耐腐蚀）时，可能需要采取额外措施。所用措施不应损害外壳的完整性。 [外文原描述]： IEC 60079-31:2013 is applicable to electrical equipment protected by enclosure and surface temperature limitation for use in explosive dust atmospheres. It specifies requirements for design, construction and testing of electrical equipment and Ex Components. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. This standard does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances. This standard does not apply to electrical 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 standard does not take account of any risk due to an emission of flammable or toxic gas from the dust. Consideration of additional protective measures is required where the application of electrical equipment is in atmospheres, which can contain combustible dust as well as explosive gas, whether simultaneously or separately. Where the electrical equipment has to meet other environmental conditions, for example, protection against ingress of water and resistance to corrosion, additional measures can be necessary. The measures used should not adversely affect the integrity of the enclosure. This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision. The major technical changes include: - The marked maximum surface temperature shall be measured on the external surfaces of the enclosure and the surfaces of the internal components for equipment with types of protection "ta"; - Additional protection for arcing and sparking parts for "ta"; - Test for internal enclosure for level "ta" added. Keywords: explosive dust atmospheres The contents of the Interpretation Sheet 1 of February 2022 have been included in this copy. This publication is to be read in conjunction with IEC 60079-0:2011 .