根据OSM决议，满足以下要求可以当做基本绝缘。
2. 10. 5 The plastic enclosure of a semiconductor can be considered as basic insulation. These components including alternatives must be listed in the list of critical components and there must be a remark in the service documentation
平时， 二次侧元件靠在光耦上， 好像也没怎么管
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