ISA 61241-2（12.10.06）-2006（R2015）给出了在可燃粉尘环境中使用的电气设备的设计、构造、测试和标记要求，其中保护气体（空气或惰性气体）的压力高于外部大气的压力，用于防止灰尘进入，否则可能导致在不含可燃灰尘源的外壳内形成可燃混合物。

ISA 61241-2 (12.10.06)-2006 (R2015) gives requirements on the design, construction, testing and marking of electrical apparatus for use in combustible dust atmospheres in which a protective gas (air or inert gas), maintained at a pressure above that of the external atmosphere, is used to prevent the entry of dust which might otherwise lead to the formation of a combustible mixture within enclosures which do not contain a source of combustible dust.