注2：不考虑在正常使用中可能发生的基本绝缘失效。

NOTE 2 Failure of basic insulation is not considered likely to occur in normal use.

youdao

注2：不考虑在正常使用中可能发生的基本绝缘失效。

NOTE 2 Failure of basic insulation is not considered likely to occur in normal use.

youdao