What is the pcb concentration in transformer oil?

The PCB concentration in transformer oil is a critical factor for environmental and health safety. Polychlorinated biphenyls (PCBs) are toxic compounds that can be present in older transformer oils. Regulations often limit PCB concentration to less than 50 parts per million (ppm) for safe use. Testing transformer oil for PCB concentration is essential to ensure compliance with environmental standards and to mitigate risks associated with PCB exposure.