Do transformers still contain PCBs?
Many transformers still contain traces of PCB-contaminated oil even after the oil has been changed several times. PCBs were also used as a plasticizer, and added to certain construction materials.
How can you tell if a transformer has a PCB?
Some nameplates specify the brand of cooling liquid inside the transformer. If one of the brand names listed in Table 1 appears on the nameplate, the transformer contains PCBs.
Do capacitors contain PCBs?
PCBs are found extensively in transformers and capacitors used in the electrical industry and in a wide range of other products. Smaller PCB filled capacitors are fitted to electric motors, welders and fluorescent lights.
Does hydraulic oil contain PCBs?
There’s a small possibility that hydraulic fluids for elevators or automotive lifts may be contaminated by PCBs, if the fluids haven’t been completely flushed and replaced since about 1984, and there’s no manufacturer-applied label that states that the fluids are PCB-free.
What does PCB look like?
Polychlorinated biphenyls (PCBs) are a group of manmade chemicals. They are oily liquids or solids, clear to yellow in color, with no smell or taste. PCBs are very stable mixtures that are resistant to extreme temperature and pressure.
Why was PCB used in transformers?
PCBs have been used as coolants and lubricants in transformers, capacitors, and other electrical equipment because they don’t burn easily and are good insulators. The manufacture of PCBs was stopped in the U.S. in 1977 because of evidence they build up in the environment and can cause harmful health effects.
When did PCBs become illegal?
PCBs belong to a broad family of man-made organic chemicals known as chlorinated hydrocarbons. PCBs were domestically manufactured from 1929 until manufacturing was banned in 1979.
Who invented polychlorinated biphenyls?
The brief story is that PCBs were invented, found to be useful, and to be profitable to one company, Monsanto, which had a monopoly in the United States and was distributing it widely before most Americans had ever heard of it.