What defines PCB free transformer oil and why is it required?

PCB free transformer oil is oil with PCB content below the regulatory threshold in the jurisdiction where it is used. Many regions treat any PCB contamination as hazardous waste above defined ppm limits, requiring special handling, labeling, and disposal. PCB free oil is required to reduce persistent environmental and health risks, simplify maintenance and decommissioning, and comply with hazardous substance rules for storage, transport, and spill response.