本操作规程适用于全封闭电气设备，该设备设计为至少加注5升油，但可能已被askarels污染。本指南给出了避免环境污染所需的预防措施和应采取的安全预防措施。

The code of practice is applicable to fully enclosed electrical equipment which is designed to be filled with at least 5 litres of oil but which may have become contaminated with askarels. Guidance is given on the precautions necessary to avoid pollution of the environment and safety precautions to be taken.