This Code of Practice gives guidance to users of fully enclosed electrical equipment which is designed to be filled with oil but which may have become contaminated with PCBs. National and Local Authority regulations (if any) take priority. This Code of Practice is applicable to fully enclosed electrical equipment which is designed to be filled with oil but which may have become contaminated with PCBs. This Code of Practice is applicable to electrical equipment which contains more than five litres of insulating and/or cooling liquid. This Code of Practice gives guidance on the precautions to avoid pollution of the environment by the correct installation, maintenance, operation, storage and transportation of oil-filled electrical equipment which may be contaminated with PCBs. This Code of Practice gives guidance on the safety precautions to be taken when handling oil which may be contaminated with PCBs, the refilling of transformers with an oil which does not contain PCBs, the disposal of waste contaminated with PCBs and on the decontamination of oil and electrical equipment. NOTE: The principles contained within this Code of Practice may be applied or if necessary adapted to suit the appropriate circumstances where equipment is filled with insulating liquids other than oil.