When is transformer oil considered toxic and how is it handled safely?

Transformer oil can be considered toxic when contaminated with hazardous substances such as PCBs, or when degraded oil contains harmful byproducts that increase exposure risk. In those cases, it is handled as hazardous material with strict PPE, controlled sampling, labeled containers, and regulated disposal. Even non PCB oils are treated with caution because mists can irritate and spills can harm the environment. Safe handling includes avoiding skin exposure, preventing ingestion, controlling spills, and following disposal and reporting rules.