Features:The insulation class is B; the protective class is IP44.
特点：绝缘等级为B级，外壳防护等级为IP44。
There are oil-proof grommets between cover and body, that can reach protective class IP65.
箱盖与箱体之间夹有耐油橡胶胶条，可保证防护等级达到“IP65”。
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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