They would likely have two separate frequencies, a standard used nationally “On the Grid” frequency, and if you’re “Off the Grid” you would need to have a different frequency then what ever is used locally.
You could use a device Like this to measure, or change the frequency of said wire.
You have a wire, it has voltage going through it, that means it has an EM field. We can measure said field in many ways. You can even measure this without needing to physically touch the wire. The absence of any electricity at all means no frequency, no em field. Put even 1mv through the wire and now it has an EM field.
You have just measured Frequency vs No frequency. Why is this such a difficult concept to understand?
Because waves are frequencies. I wanted to encourage you to think about what your were arguing about.
What are waves if not frequencies?
So you do realize that this is exactly how HV wire detectors work right lol… You hold up a wire (or there’s a wire in the wall) carrying high voltage, and the wand will pick up the EM Field.
Ahh I misunderstood you and took you for the benefit of the doubt.
If you have a system off grid then it doesn’t fucking matter.