爆炸性环境.第31部分:"t"型外壳的防尘点火设备防护

[中文适用范围]： IEC 60079 的本部分适用于受外壳和表面温度限制保护、在爆炸性粉尘环境中使用的电气设备。它规定了电气设备的设计、施工和测试的要求。本标准补充和修改了IEC 60079-0的一般要求。当本标准的要求与 IEC 60079-0 的要求相冲突时，应优先考虑本标准的要求。本标准不适用于不需要大气氧气燃烧的爆炸物粉尘或自燃物质。本标准不适用于矿井地下部分以及受沼气和/或可燃粉尘危害的矿井地面装置部分的电气设备。本标准未考虑因粉尘释放易燃或有毒气体而产生的任何风险。注 1：电气设备在可能含有可燃粉尘和爆炸性气体的大气中的应用，无论是同时还是单独，可能需要额外的保护措施。注2：当设备必须满足其他环境条件时，例如防水和耐腐蚀，可能需要额外的保护方法。所使用的方法不应对外壳的完整性产生不利影响。 [外文原描述]： IEC 60079-31:2008 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. 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 shall take precedence. This first edition of IEC 60079-31 has been developed from the first edition of IEC 61241-1 (2004) which it now cancels and supersedes. The significant changes with respect to the previous edition are: - Title changed to Equipment dust ignition protection by enclosure "t" - Combination and rationalisation of practice A and B into a single practice, and some constructional requirements that may have applied to only one practice now apply to all enclosures - Introduction of three levels of protection, "ta", "tb" and "tc" - Defined test voltage ranges and overload conditions for thermal tests - Introduction of a pressure test prior to the IP test - Restrictions on power and voltage levels for level of protection "ta" - Introduction of a variant of the IP6X test for level of protection "ta" - Compulsory dust layer thermal test for protection level "ta" by surrounding the enclosure with dust to a depth of at least 500 mm on all available surfaces. The contents of the corrigendum of March 2009 and Interpretation Sheet 1 of February 2022 have been included in this copy.