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1·When sleeving is used as supplementary insulation on internal wiring, it shall be retained in position by positive means.

当套管作为内部线的附加绝缘和加强绝缘来使用时，它应采用可靠的方式保持在位。

2·NOTE 2 the enclosure of an insulation-encased class II appliance may form a part or the whole of the supplementary insulation or of the reinforced insulation.

注2：带绝缘外壳的II类器具，其壳体可构成附加绝缘或加强绝缘的一部分或全部。