Hi! Thanks for the report. I've fixed this in two ways.
The probability of getting tinned cable on Cerys for nuclear scrap recycling is now correctly 0.28 (4x the base, meaning you'll get the same amount of copper cable as Cerys planned, plus a small amount of tin). This was the intent last update, but I accidentally changed Fulgora's scrap instead, so that's at the proper ratio now as well.
Additionally, I've added medium electric poles to the colossal and huge Cerys ruins, to bootstrap the power grid until you can recycle down to copper cable to make your own.