This is not about printed circuit boards and silicon chips but polychlorinated biphenyl a highly carcinogenic chemical compound which is used as an insulating oil in older transformers and capacitors.
Came across the following on another forum whilst reading about how the Runway Lighting had been stolen from the International Airport at Lagos in Nigeria.
It is a few years old, but still serves as a warning about checking what you eat and how it is prepared!
https://www.aljazeera.com/features/2014/12/28/thieves-fry-kenyas-power-grid-for-fast-food/
Clive