本欧洲标准规定了用于潜在爆炸性环境中的非电气设备流量限制外壳的建造和测试要求，如果外壳外部的气氛很少爆炸，仅在短时间内使用。 本标准补充了EN 13463-1的要求，其内容全部适用于根据本标准构造的设备。 符合本标准的设备符合II类 - 3类设备的要求。本标准中描述的点火保护类型不适合与另一种类型的保护结合使用，以生产除3类以外的任何其他类别的设备

This European Standard specifies the requirements for the construction and testing of flow restricting enclosures for non-electrical equipment intended for use in potentially explosive atmospheres if the atmosphere outside the enclosure becomes explosive rarely and for short durations only. This standard supplements the requirements in EN 13463-1 the contents of which apply in full to equipment constructed in accordance with this standard. Equipment complying with this standard meets the requirements of Group II - Category 3 equipment. The type of ignition protection described in this standard is unsuitable for use in combination with another type of protection to produce equipment of any other category than category 3.