有可燃性粉尘场合用电气设备.第1部分:"tD"型外壳防护

[中文适用范围]： 适用于受外壳和表面温度限制保护的电气设备，用于可能存在大量可导致火灾或爆炸危险的可燃粉尘的区域。规定了设计、施工的要求 [外文原描述]： Applicable to electrical apparatus protected by enclosures and surface temperature limitation for use in areas where combustible dust may be present in quantities which could lead to a fire or explosion hazard. Specifies requirements for design, construction and testing of electrical apparatus. The ignition protection is based on the limitation of the maximum surface temperature of the enclosure and on other surfaces which could be in contact with dust and on the restriction of dust ingress into the enclosure by the use of "dust-tight" or "dust-protected" enclosures.