It has been established that the low frequency waves from ac electrical supply wires induce cancer in humans, so why not also cats. My cats like to curl up on extension cords; there is something there which attracts them, and they are sensitive to low level signals. Cats have many sensory organs humans lack. BUT I discourage this proximity to wires because it is potentially dangerous for the cats. It has long been recommended that humans, especially children, do not sleep near ac supply electrical wires, including those in walls, and outlets.

Now Cat Columbus may well know something I do not know, but I am persuaded on the basis of many studies that these supply wires convey danger to humans and cats alike through the radiation they promulgate, especially low frequency waves.