Why is PCB analysis of transformer oil required by regulations?

PCB analysis is required because legacy equipment may contain oils contaminated with polychlorinated biphenyls, which are persistent toxic chemicals with strict handling and disposal rules. Regulations often classify equipment based on PCB concentration thresholds, which dictates labeling, storage, spill response, transport, and disposal method. Testing is needed for compliance, worker safety, and environmental protection during maintenance, retrofills, and decommissioning. It also reduces liability risk by ensuring the correct waste stream and documentation.