I am sorry, but I could not find information regarding safety procedures for handling Polychlorinated Biphenyls (PCBs) in liquid-filled electrical equipment, including regulatory compliance and disposal methods, based on the source documents provided. I can provide general safety information regarding waste and chemical handling. Always avoid the generation of waste by minimizing it where possible and recovering it if you can. Disposal of waste, solutions, packaging, and by-products should comply with environmental protection and waste disposal legislation and any regional or local authority requirements. Dispose of surplus and nonrecyclable products via a licensed waste disposal contractor and do not dispose of waste into sewers. Do not allow to enter drains or watercourses and dispose of the product according to all federal, state, and local applicable regulations. If the product is mixed with other wastes, the original waste product code may no longer apply and the appropriate code should be assigned. Also, dispose of containers contaminated by the product in accordance with local or national legal provisions and contact your local waste authority for further information. This material and its container must be disposed of in a safe way, and care should be taken when handling untreated empty containers. Avoid dispersal of spilled material and runoff and contact with soil, waterways, drains, and sewers, and do not re-use empty containers.