According to America and europe standard difference. There are two kinds, the test ways of A and B is different, but protective class is the same.
粉尘防爆电气设备根据美标和欧标的差异，为分A、B两种型式。A、B两种采用的试验方法不同，但保护的等级是等同的。
Article 52: the material, style and way of wearing of protective garments shall be appropriate to the requirements of operation and cleanliness class and shall not be otherwise used.
第五十二条工作服的选材、式样及穿戴方式应与生产操作和空气洁净度等级要求相适应，并不得混用。
Article 52: the material, style and way of wearing of protective garments shall be appropriate to the requirements of operation and cleanliness class and shall not be otherwise used.
第五十二条工作服的选材、式样及穿戴方式应与生产操作和空气洁净度等级要求相适应，并不得混用。
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