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部件 2 和 3可以看作是被已经接地的 部件 1 与live parts隔开了,不用考虑接地的问题,如果驱动器已经做到了double或reinforced绝缘,而且是SELV的,部件 1是否要结构接地就不重要了,具体看设计或买家需要了
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) Y* m" l1 o* V, B7.2.1 Metal parts screened from live parts by metal parts which are connected to the earthing terminal or earthing contact, and metal parts separated from live parts by double insulation or by reinforced insulation, are not, for the purpose of this requirement, regarded as likely to become live in the event of an insulation fault. (EN60598-1) |
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