BitSmith

Yup. Can't wait to see how this plays out!

Yes, but most likely not here. I’d be seriously surprised if there was a current draw. That would definitely indicate a flaw in the cable. A ‘scope would let you see instantaneous “data” (noise) on the line. Have you tried a different but similar cable?

Allows us to see electronically what (if anything) is happening in the wires. https://en.wikipedia.org/wiki/Oscilloscope

Wow, Greg, that’s downright crazy! Can you hang a scope on it?

If it's power strip, it most likely has a MOV (and a label that includes text to indicate surge suppression). The most common is called a metal oxide varistor (MOV). They typically look like a disc capacitor. The MOVs are placed inside the surge protector to "absorb" any excess voltage and then act as a "shunt" resistor to divert the excess current to the ground. You already knew that <grin>. If it's a simple extension cord, I'm befuddled!

Does it have built-in surge protection?